Werner Ihme

All Publications

• Ensemble Kalman Filter for Assimilating Experimental Data into Large-Eddy Simulations of Turbulent Flows FLOW TURBULENCE AND COMBUSTION Labahn, J. W., Wu, H., Harris, S. R., Coriton, B., Frank, J. H., Ihme, M. 2019

  View details for DOI 10.1007/s10494-019-00093-1

  View details for Web of Science ID 000500678600002

• Molecular diffusion and phase stability in high-pressure combustion COMBUSTION AND FLAME Yao, M. X., Hickey, J., Ma, P. C., Ihme, M. 2019; 210: 302–14

  View details for DOI 10.1016/j.combustflame.2019.08.036

  View details for Web of Science ID 000493856200023

• Numerical Analysis of Heat and Mass Transfer Coupled With Gaseous Fuel Injection in Reactive Porous Media JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME Cheng, Z., Yang, J., Guo, Z., Fu, P., Ihme, M., Wang, Q. 2019; 141 (11)

  View details for DOI 10.1115/1.4044365

  View details for Web of Science ID 000493293000015

• Efficient time-stepping techniques for simulating turbulent reactive flows with stiff chemistry COMPUTER PHYSICS COMMUNICATIONS Wu, H., Ma, P. C., Ihme, M. 2019; 243: 81–96

  View details for DOI 10.1016/j.cpc.2019.04.016

  View details for Web of Science ID 000474316900008

• Closure of the scalar dissipation rate in the spray flamelet equations through a transport equation for the gradient of the mixture fraction COMBUSTION AND FLAME Olguin, H., Scholtissek, A., Gonzalez, S., Gonzalez, F., Ihme, M., Hasse, C., Gutheil, E. 2019; 208: 330–50

  View details for DOI 10.1016/j.combustflame.2019.05.033

  View details for Web of Science ID 000488145100028

• A regularized deconvolution model for sub-grid dispersion in large eddy simulation of turbulent spray flames COMBUSTION AND FLAME Wang, Q., Zhao, X., Ihme, M. 2019; 207: 89–100

  View details for DOI 10.1016/j.combustflame.2019.05.032

  View details for Web of Science ID 000481566600008

• Examination of diesel spray combustion in supercritical ambient fluid using large-eddy simulations INTERNATIONAL JOURNAL OF ENGINE RESEARCH Chung, W., Ma, P. C., Ihme, M. 2019

  View details for DOI 10.1177/1468087419868388

  View details for Web of Science ID 000481040000001

• A regularized deconvolution method for turbulent closure modeling in implicitly filtered large-eddy simulation COMBUSTION AND FLAME Wang, Q., Ihme, M. 2019; 204: 341–55

  View details for DOI 10.1016/j.combustflame.2019.03.009

  View details for Web of Science ID 000468377000029

• On the numerical behavior of diffuse-interface methods for transcritical real-fluids simulations INTERNATIONAL JOURNAL OF MULTIPHASE FLOW Ma, P. C., Wu, H., Banuti, D. T., Ihme, M. 2019; 113: 231–49

  View details for DOI 10.1016/j.ijmultiphaseflow.2019.01.015

  View details for Web of Science ID 000469153500018

• X-ray Computed Tomography for Flame-Structure Analysis of Laminar Premixed Flames. Combustion and flame Boigne, E., Muhunthan, P., Mohaddes, D., Wang, Q., Sobhani, S., Hinshaw, W., Ihme, M. 2019; 200: 142–54

  Abstract

  Quantitative X-ray computed tomography (XCT) diagnostics for reacting flows are developed and demonstrated in application to premixed flames in open and optically inaccessible geometries. A laboratory X-ray scanner is employed to investigate methane/air flames that were diluted with krypton as an inert radiodense tracer gas. Effects of acquisition rate and tracer gas concentration on the signal-to-noise ratio are examined. It is shown that statistically converged three-dimensional attenuation measurements can be obtained with limited impact from the tracer gas and within an acceptable acquisition time. Specific aspects of the tomographic reconstruction and the experimental procedure are examined, with particular emphasis on the quantification of experimental uncertainties. A method is developed to determine density and temperature from the X-ray attenuation measurements. These experiments are complemented by one- and multi-dimensional calculations to quantify the influence of krypton on the flame behavior. To demonstrate the merit of XCT for optically inaccessible flames, measurements of a complex flame geometry in a tubular confinement are performed. The use of a coflow to provide a uniform tracer-gas concentration is shown to improve the quantitative temperature evaluation. These measurements demonstrate the viability of XCT for flame-structure analysis and multi-dimensional temperature measurements using laboratory X-ray systems. Further opportunities for improving this diagnostic are discussed.

  View details for PubMedID 30532316

• X-ray computed tomography for flame-structure analysis of laminar premixed flames COMBUSTION AND FLAME Boigne, E., Muhunthan, P., Mohaddes, D., Wang, Q., Sobhani, S., Hinshaw, W., Ihme, M. 2019; 200: 142–54

  View details for DOI 10.1016/j.combustflame.2018.11.015

  View details for Web of Science ID 000458089500015

• Error-controlled kinetics reduction based on non-linear optimization and sensitivity analysis COMBUSTION AND FLAME Jaravel, T., Wu, H., Ihme, M. 2019; 200: 192–206

  View details for DOI 10.1016/j.combustflame.2018.11.007

  View details for Web of Science ID 000458089500018

• DATA ASSIMILATION AND OPTIMAL CALIBRATION IN NONLINEAR MODELS OF FLAME DYNAMICS Yu, H., Jaravel, T., Ihme, M., Juniper, M. P., Magri, L., ASME AMER SOC MECHANICAL ENGINEERS. 2019

  View details for Web of Science ID 000502164700058

• Functionalization of 2D materials for enhancing OER/ORR catalytic activity in Li–oxygen batteries Functionalization of 2D materials for enhancing OER/ORR catalytic activity in Li–oxygen batteries Ostadhossein, A., Guo, J., Simeski, F., Ihme, M. 2019

  View details for DOI 10.1038/s42004-019-0196-2

• Modulation of heat transfer for extended flame stabilization in porous media burners via topology gradation PROCEEDINGS OF THE COMBUSTION INSTITUTE Sobhani, S., Mohaddes, D., Boigne, E., Muhunthan, P., Ihme, M. 2019; 37 (4): 5697–5704

  View details for DOI 10.1016/j.proci.2018.05.155

  View details for Web of Science ID 000457095600156

• Pareto-efficient combustion modeling for improved CO-emission prediction in LES of a piloted turbulent dimethyl ether jet flame PROCEEDINGS OF THE COMBUSTION INSTITUTE Wu, H., Ma, P. C., Jaravel, T., Ihme, M. 2019; 37 (2): 2267–76

  View details for DOI 10.1016/j.proci.2018.08.010

  View details for Web of Science ID 000456621500116

• Analysis of transient blow-out dynamics in a swirl-stabilized combustor using large-eddy simulations PROCEEDINGS OF THE COMBUSTION INSTITUTE Ma, P. C., Wu, H., Labahn, J. W., Jaravel, T., Ihme, M. 2019; 37 (4): 5073–82

  View details for DOI 10.1016/j.proci.2018.06.066

  View details for Web of Science ID 000457095600085

• Data assimilation using high-speed measurements and LES to examine local extinction events in turbulent flames PROCEEDINGS OF THE COMBUSTION INSTITUTE Labahn, J. W., Wu, H., Coriton, B., Frank, J. H., Ihme, M. 2019; 37 (2): 2259–66

  View details for DOI 10.1016/j.proci.2018.06.043

  View details for Web of Science ID 000456621500115

• Shock capturing for discontinuous Galerkin methods with application to predicting heat transfer in hypersonic flows JOURNAL OF COMPUTATIONAL PHYSICS Ching, E. J., Lv, Y., Gnoffob, P., Barnhardt, M., Ihme, M. 2019; 376: 54–75

  View details for DOI 10.1016/j.jcp.2018.09.016

  View details for Web of Science ID 000450337400004

• A new ignition time model applied to super knock PROCEEDINGS OF THE COMBUSTION INSTITUTE Grogan, K. P., Ihme, M. 2019; 37 (3): 3487–94

  View details for DOI 10.1016/j.proci.2018.07.055

  View details for Web of Science ID 000456628600096

• Assessment of spray combustion models in large-eddy simulations of a polydispersed acetone spray flame PROCEEDINGS OF THE COMBUSTION INSTITUTE Wang, Q., Jaravel, T., Ihme, M. 2019; 37 (3): 3335–44

  View details for DOI 10.1016/j.proci.2018.06.011

  View details for Web of Science ID 000456628600079

• Coupling of turbulence on the ignition of multicomponent sprays PROCEEDINGS OF THE COMBUSTION INSTITUTE Govindaraju, P. B., Jaravel, T., Ihme, M. 2019; 37 (3): 3295–3302

  View details for DOI 10.1016/j.proci.2018.05.166

  View details for Web of Science ID 000456628600074

• Large-eddy simulations of transcritical injection and auto-ignition using diffuse-interface method and finite-rate chemistry PROCEEDINGS OF THE COMBUSTION INSTITUTE Ma, P. C., Wu, H., Jaravel, T., Bravo, L., Ihme, M. 2019; 37 (3): 3303–10

  View details for DOI 10.1016/j.proci.2018.05.063

  View details for Web of Science ID 000456628600075

• Large eddy simulations of diesel-fuel injection and auto-ignition at transcritical conditions Ihme, M., Ma, P. C., Bravo, L. SAGE PUBLICATIONS LTD. 2019: 58–68

  View details for DOI 10.1177/1468087418819546

  View details for Web of Science ID 000456398900006

• Assessment of differential diffusion effects in flamelet modeling of oxy-fuel flames COMBUSTION AND FLAME Gierth, S., Hunger, F., Popp, S., Wu, H., Ihme, M., Hasse, C. 2018; 197: 134–44

  View details for DOI 10.1016/j.combustflame.2018.07.023

  View details for Web of Science ID 000447815800014

• Thermodynamic structure of supercritical LOX-GH2 diffusion flames COMBUSTION AND FLAME Banuti, D. T., Ma, P. C., Hickey, J., Ihme, M. 2018; 196: 364–76

  View details for DOI 10.1016/j.combustflame.2018.06.016

  View details for Web of Science ID 000445848100032

• Nonadiabatic Flamelet Formulation for Predicting Wall Heat Transfer in Rocket Engines AIAA JOURNAL Ma, P. C., Wu, H., Ihme, M., Hickey, J. 2018; 56 (6): 2336–49

  View details for DOI 10.2514/1.J056539

  View details for Web of Science ID 000433557100022

• Structure of wall-bounded flows at transcritical conditions PHYSICAL REVIEW FLUIDS Ma, P. C., Yang, X. A., Ihme, M. 2018; 3 (3)

  View details for DOI 10.1103/PhysRevFluids.3.034609

  View details for Web of Science ID 000428785000003

• Effects of Nozzle Helmholtz Number on Indirect Combustion Noise by Compositional Perturbations JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME Magri, L., O'Brien, J., Ihme, M. 2018; 140 (3)

  View details for DOI 10.1115/1.4037914

  View details for Web of Science ID 000426056900001

• Phase transitions of ordered ice in graphene nanocapillaries and carbon nanotubes SCIENTIFIC REPORTS Raju, M., van Duin, A., Ihme, M. 2018; 8: 3851

  Abstract

  New phase diagrams for water confined in graphene nanocapillaries and single-walled carbon nanotubes (CNTs) are proposed, identifying ice structures, their melting points and revealing the presence of a solid-liquid critical point. For quasi-2D water in nanocapillaries, we show through molecular-dynamics simulations that AA stacking in multilayer quasi-2D ice arises from interlayer hydrogen-bonding and is stable up to three layers, thereby explaining recent experimental observations. Detailed structural and energetic analyses show that quasi-2D water can freeze discontinuously through a first-order phase transition or continuously with a critical point. The first-order transition line extends to a continuous transition line, defined by a sharp transition in diffusivity between solid-like and liquid-like regimes. For quasi-1D water, confined in CNTs, we observe the existence of a similar critical point at intermediate densities. In addition, an end point is identified on the continuous-transition line, above which the solid and liquid phases deform continuously. The solid-liquid phase transition temperatures in CNTs are shown to be substantially higher than 273 K, confirming recent Raman spectroscopy measurements. We observe ultrafast proton and hydroxyl transport in quasi-1D and -2D ice at 300 K, exceeding those of bulk water up to a factor of five, thereby providing possible applications to fuel-cells and electrolyzers.

  View details for PubMedID 29497132

• Atomistic and continuum scale modeling of functionalized graphyne membranes for water desalination NANOSCALE Raju, M., Govindaraju, P. B., van Duin, A. T., Ihme, M. 2018; 10 (8): 3969–80

  Abstract

  Recent theoretical and experimental studies reported ultra-high water permeability and salt rejection in nanoporous single-layer graphene. However, creating and controlling the size and distribution of nanometer-scale pores pose significant challenges to application of these membranes for water desalination. Graphyne and hydrogenated graphyne have tremendous potential as ultra-permeable membranes for desalination and wastewater reclamation due to their uniform pore-distribution, atomic thickness and mechano-chemical stability. Using molecular dynamics (MD) simulations and upscale continuum analysis, the desalination performance of bare and hydrogenated α-graphyne and γ-{2,3,4}-graphyne membranes is evaluated as a function of pore size, pore geometry, chemical functionalization and applied pressure. MD simulations show that pores ranging from 20 to 50 Å2 reject in excess of 90% of the ions for pressures up to 1 GPa. Water permeability is found to range up to 85 L cm-2 day-1 MPa-1, which is up to three orders of magnitude larger than commercial seawater reverse osmosis (RO) membranes and up to ten times that of nanoporous graphene. Pore chemistry, functionalization and geometry are shown to play a critical role in modulating the water flux, and these observations are explained by water velocity, density, and energy barriers in the pores. The atomistic scale investigations are complemented by upscale continuum analysis to examine the performance of these membranes in application to cross-flow RO systems. This upscale analysis, however, shows that the significant increase in permeability, observed from MD simulations, does not fully translate to current RO systems due to transport limitations. Nevertheless, upscale calculations predict that the higher permeability of graphyne membranes would allow up to six times higher permeate recovery or up to 6% less energy consumption as compared to thin-film composite membranes at currently accessible operating conditions. Significantly higher energy savings and permeate recovery can be achieved if higher feed-flow rates can be realized.

  View details for PubMedID 29424378

• Formulation of optimal surrogate descriptions of fuels considering sensitivities to experimental uncertainties COMBUSTION AND FLAME Govindaraju, P. B., Ihme, M. 2018; 188: 337–56

  View details for DOI 10.1016/j.combustflame.2017.09.044

  View details for Web of Science ID 000424859100028

• On underresolved simulations of compressible turbulence using an entropy-bounded DG method: Solution stabilization, scheme optimization, and benchmark against a finite-volume solver COMPUTERS & FLUIDS Lv, Y., Ma, P. C., Ihme, M. 2018; 161: 89–106

  View details for DOI 10.1016/j.compfluid.2017.11.016

  View details for Web of Science ID 000423643600008

• Flamelet regime characterization for non-premixed turbulent combustion simulations COMBUSTION AND FLAME Chan, W., Ihme, M. 2017; 186: 220–35

  View details for DOI 10.1016/j.combustflame.2017.08.003

  View details for Web of Science ID 000413134100018

• Lyapunov exponent as a metric for assessing the dynamic content and predictability of large-eddy simulations PHYSICAL REVIEW FLUIDS Nastac, G., Labahn, J. W., Magri, L., Ihme, M. 2017; 2 (9)

  View details for DOI 10.1103/PhysRevFluids.2.094606

  View details for Web of Science ID 000411331000005

• A general probabilistic approach for the quantitative assessment of LES combustion models COMBUSTION AND FLAME Johnson, R., Wu, H., Ihme, M. 2017; 183: 88–101

  View details for DOI 10.1016/j.combustflame.2017.05.004

  View details for Web of Science ID 000406648300010

• An entropy-stable hybrid scheme for simulations of transcritical real-fluid flows JOURNAL OF COMPUTATIONAL PHYSICS Ma, P. C., lv, Y., Ihme, M. 2017; 340: 330–57

  View details for DOI 10.1016/j.jcp.2017.03.022

  View details for Web of Science ID 000401137900016

• Fuel effects on lean blow-out in a realistic gas turbine combustor COMBUSTION AND FLAME Esclapez, L., Ma, P. C., Mayhew, E., Xu, R., Stouffer, S., Lee, T., Wang, H., Ihme, M. 2017; 181: 82–99

  View details for DOI 10.1016/j.combustflame.2017.02.035

  View details for Web of Science ID 000403525500007

• High-order discontinuous Galerkin method for applications to multicomponent and chemically reacting flows ACTA MECHANICA SINICA Lv, Y., Ihme, M. 2017; 33 (3): 486–99

  View details for DOI 10.1007/s10409-017-0664-9

  View details for Web of Science ID 000404898900002

• Similarity law for Widom lines and coexistence lines PHYSICAL REVIEW E Banuti, D. T., Raju, M., Ihme, M. 2017; 95 (5)

  View details for DOI 10.1103/PhysRevE.95.052120

  View details for Web of Science ID 000401234900004

• Non-equilibrium wall-modeling for internal combustion engine simulations with wall heat transfer INTERNATIONAL JOURNAL OF ENGINE RESEARCH Ma, P. C., Greene, M., Sick, V., Ihme, M. 2017; 18 (1-2): 15-25

  View details for DOI 10.1177/1468087416686699

  View details for Web of Science ID 000395323400003

• Regularized deconvolution method for turbulent combustion modeling COMBUSTION AND FLAME Wang, Q., Ihme, M. 2017; 176: 125-142

  View details for DOI 10.1016/j.combustflame.2016.09.023

  View details for Web of Science ID 000395497700012

• An investigation of internal flame structure in porous media combustion via X-ray Computed Tomography PROCEEDINGS OF THE COMBUSTION INSTITUTE Dunnmon, J., Sobhani, S., Wu, M., Fahrig, R., Ihme, M. 2017; 36 (3): 4399-4408

  View details for DOI 10.1016/j.proci.2016.06.188

  View details for Web of Science ID 000393412600120

• Widom Lines in Binary Mixtures of Supercritical Fluids. Scientific reports Raju, M., Banuti, D. T., Ma, P. C., Ihme, M. 2017; 7 (1): 3027

  Abstract

  Recent experiments on pure fluids have identified distinct liquid-like and gas-like regimes even under supercritical conditions. The supercritical liquid-gas transition is marked by maxima in response functions that define a line emanating from the critical point, referred to as Widom line. However, the structure of analogous state transitions in mixtures of supercritical fluids has not been determined, and it is not clear whether a Widom line can be identified for binary mixtures. Here, we present first evidence for the existence of multiple Widom lines in binary mixtures from molecular dynamics simulations. By considering mixtures of noble gases, we show that, depending on the phase behavior, mixtures transition from a liquid-like to a gas-like regime via distinctly different pathways, leading to phase relationships of surprising complexity and variety. Specifically, we show that miscible binary mixtures have behavior analogous to a pure fluid and the supercritical state space is characterized by a single liquid-gas transition. In contrast, immiscible binary mixture undergo a phase separation in which the clusters transition separately at different temperatures, resulting in multiple distinct Widom lines. The presence of this unique transition behavior emphasizes the complexity of the supercritical state to be expected in high-order mixtures of practical relevance.

  View details for PubMedID 28596591

  View details for PubMedCentralID PMC5465206

• SPECIES DEPENDENCY OF THE COMPOSITIONAL INDIRECT NOISE MECHANISM O'Brien, J. D., Ihme, M., ASME AMER SOC MECHANICAL ENGINEERS. 2017

  View details for Web of Science ID 000412715300002

• EFFECTS OF NOZZLE HELMHOLTZ NUMBER ON INDIRECT COMBUSTION NOISE BY COMPOSITIONAL PERTURBATIONS Magri, L., O'Brien, J., Ihme, M., ASME AMER SOC MECHANICAL ENGINEERS. 2017

  View details for Web of Science ID 000412715300003

• Combustion and Engine-Core Noise ANNUAL REVIEW OF FLUID MECHANICS, VOL 49 Ihme, M. 2017; 49: 277-310

  View details for DOI 10.1146/annurev-fluid-122414-034542

  View details for Web of Science ID 000396042600012

• Regimes describing shock boundary layer interaction and ignition in shock tubes PROCEEDINGS OF THE COMBUSTION INSTITUTE Grogan, K. P., Ihme, M. 2017; 36 (2): 2927-2935

  View details for DOI 10.1016/j.proci.2016.06.078

  View details for Web of Science ID 000397458900145

• Numerical investigation of soot-flame-vortex interaction PROCEEDINGS OF THE COMBUSTION INSTITUTE Franzelli, B., Cuoci, A., Stagni, A., Ihme, M., Faravelli, T., Candel, S. 2017; 36 (1): 753-761

  View details for DOI 10.1016/j.proci.2016.07.128

  View details for Web of Science ID 000397464200073

• The role of preferential evaporation on the ignition of multicomponent fuels in a homogeneous spray/air mixture PROCEEDINGS OF THE COMBUSTION INSTITUTE Stagni, A., Esclapez, L., Govindaraju, P., Cuoci, A., Faravelli, T., Ihme, M. 2017; 36 (2): 2483-2491

  View details for DOI 10.1016/j.proci.2016.06.052

  View details for Web of Science ID 000397458900095

• The cross-scale physical-space transfer of kinetic energy in turbulent premixed flames PROCEEDINGS OF THE COMBUSTION INSTITUTE O'Brien, J., Towery, C. A., Hamlington, P. E., Ihme, M., Poludnenko, A. Y., Urzay, J. 2017; 36 (2): 1967-1975

  View details for DOI 10.1016/j.proci.2016.05.005

  View details for Web of Science ID 000397458900039

• Development and Analysis of Wall Models for Internal Combustion Engine Simulations Using High-speed Micro-PIV Measurements FLOW TURBULENCE AND COMBUSTION Ma, P. C., Ewan, T., Jainski, C., Lu, L., Dreizler, A., Sick, V., Ihme, M. 2017; 98 (1): 283-309

  View details for DOI 10.1007/s10494-016-9734-5

  View details for Web of Science ID 000390089400014

• Classification and lift-off height prediction of non-premixed MILD and autoignitive flames PROCEEDINGS OF THE COMBUSTION INSTITUTE Evans, M. J., Medwell, P. R., Wu, H., Stagni, A., Ihme, M. 2017; 36 (3): 4297-4304

  View details for DOI 10.1016/j.proci.2016.06.013

  View details for Web of Science ID 000393412600108

• Multiple-scale thermo-acoustic stability analysis of a coaxial jet combustor PROCEEDINGS OF THE COMBUSTION INSTITUTE Magri, L., See, Y., Tammisola, O., Ihme, M., Juniper, M. P. 2017; 36 (3): 3863-3871

  View details for DOI 10.1016/j.proci.2016.06.009

  View details for Web of Science ID 000393412600059

• Compliance of combustion models for turbulent reacting flow simulations FUEL Wu, H., Ihme, M. 2016; 186: 853-863

  View details for DOI 10.1016/j.fuel.2016.07.074

  View details for Web of Science ID 000385318600087

• Group contribution method for multicomponent evaporation with application to transportation fuels INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER Govindaraju, P. B., Ihme, M. 2016; 102: 833-845

  View details for DOI 10.1016/j.ijheatmasstransfer.2016.06.079

  View details for Web of Science ID 000382410300078

• An entropy-residual shock detector for solving conservation laws using high-order discontinuous Galerkin methods JOURNAL OF COMPUTATIONAL PHYSICS Lv, Y., See, Y. C., Ihme, M. 2016; 322: 448-472

  View details for DOI 10.1016/j.jcp.2016.06.052

  View details for Web of Science ID 000381585100024

• Compositional inhomogeneities as a source of indirect combustion noise JOURNAL OF FLUID MECHANICS Magri, L., O'Brien, J., Ihme, M. 2016; 799

  View details for DOI 10.1017/jfm.2016.397

  View details for Web of Science ID 000379141100004

• Spectral kinetic energy transfer in turbulent premixed reacting flows PHYSICAL REVIEW E Towery, C. A., Poludnenko, A. Y., Urzay, J., O'Brien, J., Ihme, M., Hamlington, P. E. 2016; 93 (5)

  Abstract

  Spectral kinetic energy transfer by advective processes in turbulent premixed reacting flows is examined using data from a direct numerical simulation of a statistically planar turbulent premixed flame. Two-dimensional turbulence kinetic-energy spectra conditioned on the planar-averaged reactant mass fraction are computed through the flame brush and variations in the spectra are connected to terms in the spectral kinetic energy transport equation. Conditional kinetic energy spectra show that turbulent small-scale motions are suppressed in the burnt combustion products, while the energy content of the mean flow increases. An analysis of spectral kinetic energy transfer further indicates that, contrary to the net down-scale transfer of energy found in the unburnt reactants, advective processes transfer energy from small to large scales in the flame brush close to the products. Triadic interactions calculated through the flame brush show that this net up-scale transfer of energy occurs primarily at spatial scales near the laminar flame thermal width. The present results thus indicate that advective processes in premixed reacting flows contribute to energy backscatter near the scale of the flame.

  View details for DOI 10.1103/PhysRevE.93.053115

  View details for Web of Science ID 000376644900015

  View details for PubMedID 27300986

• Phase transitions in quasi 1-D and 2-D nanoconfined water Raju, M., Van Duin, A., Ihme, M. AMER CHEMICAL SOC. 2016

  View details for Web of Science ID 000431903806567

• Reaxff reactive force field study of oriented attachment of TiO2 nanocrystals in non-aqueous solvents Raju, M., Penn, R., Fichthorn, K., Ihme, M. AMER CHEMICAL SOC. 2016

  View details for Web of Science ID 000431903805574

• Water desalination and selective ion-separation using single-layer graphyne and hydrogenated graphyne membranes at realistic reverse-osmosis pressures Raju, M., Van Duin, A., Ihme, M. AMER CHEMICAL SOC. 2016

  View details for Web of Science ID 000431905700784

• Characterizing spray flame-vortex interaction: A spray spectral diagram for extinction COMBUSTION AND FLAME Franzelli, B., Vie, A., Ihme, M. 2016; 163: 100-114

  View details for DOI 10.1016/j.combustflame.2015.09.006

  View details for Web of Science ID 000367278600009

• On the generalisation of the mixture fraction to a monotonic mixing-describing variable for the flamelet formulation of spray flames COMBUSTION THEORY AND MODELLING Franzelli, B., Vie, A., Ihme, M. 2015; 19 (6): 773-806

  View details for DOI 10.1080/13647830.2015.1099740

  View details for Web of Science ID 000366248600005

• A Pareto-efficient combustion framework with submodel assignment for predicting complex flame configurations COMBUSTION AND FLAME Wu, H., See, Y. C., Wang, Q., Ihme, M. 2015; 162 (11): 4208-4230

  View details for DOI 10.1016/j.combustflame.2015.06.021

  View details for Web of Science ID 000363998300013

• Characterization of scalar mixing in dense gaseous jets using X-ray computed tomography EXPERIMENTS IN FLUIDS Dunnmon, J., Sobhani, S., Kim, T. W., Kovscek, A., Ihme, M. 2015; 56 (10)

  View details for DOI 10.1007/s00348-015-2057-9

  View details for Web of Science ID 000363486500009

• Entropy-bounded discontinuous Galerkin scheme for Euler equations JOURNAL OF COMPUTATIONAL PHYSICS Lv, Y., Ihme, M. 2015; 295: 715-739

  View details for DOI 10.1016/j.jcp.2015.04.026

  View details for Web of Science ID 000354399700033

• Ignition regimes in rapid compression machines COMBUSTION AND FLAME Grogan, K. P., Goldsborough, S. S., Ihme, M. 2015; 162 (8): 3071-3080

  View details for DOI 10.1016/j.combustflame.2015.03.020

  View details for Web of Science ID 000356999700008

• An SMLD Joint PDF Model for Turbulent Non-Premixed Combustion Using the Flamelet Progress-Variable Approach FLOW TURBULENCE AND COMBUSTION Coclite, A., Pascazio, G., De Palma, P., Cutrone, L., Ihme, M. 2015; 95 (1): 97-119

  View details for DOI 10.1007/s10494-015-9609-1

  View details for Web of Science ID 000355927500005

• Quantitative model-based imaging of mid-infrared radiation from a turbulent nonpremixed jet flame and plume COMBUSTION AND FLAME Rankin, B. A., Ihme, M., Gore, J. P. 2015; 162 (4): 1275-1283

  View details for DOI 10.1016/j.combustflame.2014.10.019

  View details for Web of Science ID 000351794100032

• A multi-scale asymptotic scaling and regime analysis of flamelet equations including tangential diffusion effects for laminar and turbulent flames COMBUSTION AND FLAME Scholtissek, A., Chan, W. L., Xu, H., Hunger, F., Kolla, H., Chen, J. H., Ihme, M., Hasse, C. 2015; 162 (4): 1507-1529

  View details for DOI 10.1016/j.combustflame.2014.11.016

  View details for Web of Science ID 000351794100053

• Weak and strong ignition of hydrogen/oxygen mixtures in shock-tube systems PROCEEDINGS OF THE COMBUSTION INSTITUTE Grogan, K. P., Ihme, M. 2015; 35: 2181-2189

  View details for DOI 10.1016/j.proci.2014.07.074

  View details for Web of Science ID 000348048800120

• Large eddy simulation of a partially-premixed gas turbine model combustor PROCEEDINGS OF THE COMBUSTION INSTITUTE See, Y. C., Ihme, M. 2015; 35: 1225-1234

  View details for DOI 10.1016/j.proci.2014.08.006

  View details for Web of Science ID 000348048800012

• Analysis of segregation and bifurcation in turbulent spray flames: A 3D counterflow configuration PROCEEDINGS OF THE COMBUSTION INSTITUTE Vie, A., Franzelli, B., Gao, Y., Lu, T., Wang, H., Ihme, M. 2015; 35: 1675-1683

  View details for DOI 10.1016/j.proci.2014.06.083

  View details for Web of Science ID 000348048800061

• Computational analysis of re-ignition and re-initiation mechanisms of quenched detonation waves behind a backward facing step PROCEEDINGS OF THE COMBUSTION INSTITUTE Lv, Y., Ihme, M. 2015; 35: 1963-1972

  View details for DOI 10.1016/j.proci.2014.07.041

  View details for Web of Science ID 000348048800095

• Coupling of flame geometry and combustion instabilities based on kilohertz formaldehyde PLIF measurements PROCEEDINGS OF THE COMBUSTION INSTITUTE Allison, P. M., Chen, Y., Ihme, M., Driscoll, J. F. 2015; 35: 3255-3262

  View details for DOI 10.1016/j.proci.2014.05.127

  View details for Web of Science ID 000348049500089

• Instability of elliptic liquid jets: Temporal linear stability theory and experimental analysis PHYSICS OF FLUIDS Amini, G., Lv, Y., Dolatabadi, A., Ihme, M. 2014; 26 (11)

  View details for DOI 10.1063/1.4901246

  View details for Web of Science ID 000345578700024

• Assessment of model assumptions and budget terms of the unsteady flamelet equations for a turbulent reacting jet-in-cross-flow COMBUSTION AND FLAME Chan, W. L., Kolla, H., Chen, J. H., Ihme, M. 2014; 161 (10): 2601-2613

  View details for DOI 10.1016/j.combustflame.2014.04.007

  View details for Web of Science ID 000341905200011

• Effects of flow-field and mixture inhomogeneities on the ignition dynamics in continuous flow reactors COMBUSTION AND FLAME Wu, H., Ihme, M. 2014; 161 (9): 2317-2326

  View details for DOI 10.1016/j.combustflame.2014.02.007

  View details for Web of Science ID 000340443400010

• Tabulated chemistry approach for diluted combustion regimes with internal recirculation and heat losses COMBUSTION AND FLAME Lamouroux, J., Ihme, M., Fiorina, B., Gicquel, O. 2014; 161 (8): 2120-2136

  View details for DOI 10.1016/j.combustflame.2014.01.015

  View details for Web of Science ID 000337990500015

• Discontinuous Galerkin method for multicomponent chemically reacting flows and combustion JOURNAL OF COMPUTATIONAL PHYSICS Lv, Y., Ihme, M. 2014; 270: 105-137

  View details for DOI 10.1016/j.jcp.2014.03.029

  View details for Web of Science ID 000336406200007

• Modeling of Non-Equilibrium Homogeneous Turbulence in Rapidly Compressed Flows FLOW TURBULENCE AND COMBUSTION Hamlington, P. E., Ihme, M. 2014; 93 (1): 93-124

  View details for DOI 10.1007/s10494-014-9535-7

  View details for Web of Science ID 000338232700005

• Effects of finite-rate chemistry and detailed transport on the instability of jet diffusion flames JOURNAL OF FLUID MECHANICS See, Y. C., Ihme, M. 2014; 745: 647-681

  View details for DOI 10.1017/jfm.2014.95

  View details for Web of Science ID 000333907700027

• Subgrid-scale backscatter in reacting and inert supersonic hydrogen-air turbulent mixing layers JOURNAL OF FLUID MECHANICS O'Brien, J., Urzay, J., Ihme, M., Moin, P., Saghafian, A. 2014; 743: 554-584

  View details for DOI 10.1017/jfm.2014.62

  View details for Web of Science ID 000332844200024

• Large-eddy simulation of a piloted premixed jet burner COMBUSTION AND FLAME Chen, Y., Ihme, M. 2013; 160 (12): 2896-2910

  View details for DOI 10.1016/j.combustflame.2013.07.009

  View details for Web of Science ID 000326061700022

• Effect of gravity on capillary instability of liquid jets PHYSICAL REVIEW E Amini, G., Ihme, M., Dolatabadi, A. 2013; 87 (5)

  Abstract

  The effect of gravity on the onset and growth rate of capillary instabilities in viscous liquid jets is studied. To this end, a spatial linear stability analysis of Cosserat's equations is performed using a multiscale expansion technique. A dispersion relation and expressions for the perturbation amplitude are derived to evaluate the growth rate of the most unstable axisymmetric disturbance mode. Modeling results are compared with classical results in the limit of zero Bond number, confirming the validity of this approach. Expressions for the critical Weber number, demarcating the transition between convective and absolute instability are derived as functions of capillary and Bond numbers. Parametric investigations for a range of relevant operating conditions (characterized by capillary, Weber, and Bond numbers) are performed to examine the jet breakup and the perturbation growth rate. In addition to the physical insight that is obtained from this investigation, the results that are presented in this work could also be of relevance as test cases for the algorithmic development and the verification of high-fidelity multiphase simulation codes.

  View details for DOI 10.1103/PhysRevE.87.053017

  View details for Web of Science ID 000319284800009

  View details for PubMedID 23767630

• Effect of gravity on capillary instability of liquid jets. Physical Review E Amini, G., Ihme, M., Dolatabadi, A. 2013; 87: 053017
• Acoustic characterization of a partially-premixed gas turbine model combustor: Syngas and hydrocarbon fuel comparisons PROCEEDINGS OF THE COMBUSTION INSTITUTE Allison, P. M., Driscoll, J. F., Ihme, M. 2013; 34: 3145-3153

  View details for DOI 10.1016/j.proci.2012.06.157

  View details for Web of Science ID 000313131800144

• Liquid Jet Instability Under Gravity Effects. Amini, G., Ihme, M. 2013
• Detailed Simulations of Shock-Bifurcation and Ignition of an Argon-diluted Hydrogen/Oxygen Mixture in a Shock Tube. Ihme, M., Sun, Y., Deterding, R. 2013
• Large Eddy Simulation of Shear Coaxial Rocket Injector: Real Fluid Effects. Hickey, J., P., Ma, P., C., Ihme, M., Thakur, S. 2013
• Discontinuous Galerkin Method for Compressible Viscous Reacting Flows. Lv, Y., Ihme, M. 2013
• Acoustic characterization of a partially-premixed gas turbine model combustor: Syngas and hydrocarbon fuel comparisons. Allison, P., M., Driscoll, J., F., Ihme, M. 2013
• Regularization of reaction progress variable for application to flamelet-based combustion models. Journal of Computational Physics Ihme, M., Shunn, L., Zhang, J. 2012; 23 (231): 7715-7721
• On the generation of direct combustion noise in turbulent non-premixed flames INTERNATIONAL JOURNAL OF AEROACOUSTICS Ihme, M., Pitsch, H. 2012; 11 (1): 25-78

  View details for Web of Science ID 000299393900002

• On the generation of direct combustion noise in turbulent nonpremixed flames. International Journal of Aeroacoustics Ihme, M., Pitsch, H. 2012; 11: 25-78
• On the role of turbulence in rapid compression machines: Autoignition of syngas mixtures. Combustion and Flame Ihme, M. 2012; 157: 1592-1604
• Large-eddy simulation of a jet in hot coflow burner operating in the oxygen-diluted combustion regime. Flow, Turbulence and Combustion Ihme, M., Zhang, J., He, G., Dally, B. 2012; 3 (89): 449-464
• Reduced order modeling of turbulent reacting flows with application to scramjets. Journal of Propulsion and Power Torrez, S., M., Driscoll, J., F., Ihme, M., Fotia, M., L. 2011; 2 (27): 371-382
• LES flamelet modeling of a three-stream MILD combustor: Analysis of flame sensitivity to scalar inflow conditions PROCEEDINGS OF THE COMBUSTION INSTITUTE Ihme, M., See, Y. C. 2011; 33: 1309-1317

  View details for DOI 10.1016/j.proci.2010.05.019

  View details for Web of Science ID 000285780200144

• LES Modeling of a Turbulent Lifted Flame in a Vitiated Co-flow Using an Unsteady Flamelet/Progress Variable Formulation 8th Workshop on Direct and Large-Eddy Simulation Ihme, M., See, Y. C. SPRINGER. 2011: 339–344

  View details for DOI 10.1007/978-94-007-2482-2_54

  View details for Web of Science ID 000323091800054

• LES modeling of a turbulent lifted flame in a vitiated co-flow using an unsteady flamelet/progress variable formulation. Direct and Large-Eddy Simulation VIII, Proceedings of the Eighth International ERCOFTAC Workshop on Direct and Large-Eddy Simulation Ihme, M., See, Y., C. edited by Kuerten, J., G.M. University of Eindhoven. 2011
• LES modeling of a turbulent lifted flame in a vitiated co-flow using an unsteady flamelet/progress variable formulation. M., Ihme, Y., See, C. edited by Kuerten, J., G.M. 2011
• Characterization of flow field structure and species composition in a shear coaxial rocket GH2/GO2 injector: Modeling of wall heat losses. Presented at the 47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, AIAA 2011-6125, San Diego, CA Lee, D., J., Thakur, S., Wright, J., Ihme, M., Shyy, W. 2011
• Characterization of flow field structure and species composition in a shear coaxial rocket GH2/GO2 injector: Modeling of wall heat losses. Lee, D., J., Thakur, S., Wright, J., Ihme, M., Shyy, W. 2011
• LES of a gaseous H2/O2 rocket injector: Wall heat transfer modeling. Lee, D., J., Ihme, M., Thakur, S., Shyy, W. 2011
• Reconcile discrepancies of current syngas kinetics models by considering turbulence effects on ignition delay at gas-turbine relevant operating conditions. Ihme, M. 2011
• LES flamelet modeling of a three-stream MILD combustor: Analysis of flame sensitivity to scalar inflow conditions. Ihme, M., See, Y., C. 2011
• Construction of Optimal Artificial Neural Network Architectures for Application to Chemical Systems: Comparison of Generalized Pattern Search Method and Evolutionary Algorithm. Artificial Neural Networks Ihme, M. InTech Open Access Publisher. 2011
• Prediction of autoignition in a lifted methane/air flame using an unsteady flamelet/progress variable model COMBUSTION AND FLAME Ihme, M., See, Y. C. 2010; 157 (10): 1850-1862

  View details for DOI 10.1016/j.combustflame.2010.07.015

  View details for Web of Science ID 000281337800005

• Prediction of autoignition in a lifted methane/air flame using an unsteady flamelet/progress variable model. Combustion and Flame Ihme, M., See, Y., C. 2010; 157: 1850-1862
• Topological Optimization of Artificial Neural Networks Using a Pattern Search Method. Neural Computation and Particle Accelerators: Research, Technology and Applications (Neuroscience Research Progress) Ihme, M. edited by Chabot, E., D’arras, H. Nova Science Publishers. 2010
• Analysis of different sound source formulations to simulate combustion generated noise using a hybrid LES/APE-RF method. International Journal of Aeroacoustics Bui, T., P., Ihme, M., Schroeder, W., Pitsch, H. 2009; 1-2 (8): 95-123
• Optimal artificial neural networks and tabulation methods for chemistry representation in LES of a bluff-body swirl-stabilized flame PROCEEDINGS OF THE COMBUSTION INSTITUTE Ihme, M., Schmitt, C., Pitsch, H. 2009; 32: 1527-1535

  View details for DOI 10.1016/j.proci.2008.06.100

  View details for Web of Science ID 000264756800176

• Radiation of noise in turbulent non-premixed flames PROCEEDINGS OF THE COMBUSTION INSTITUTE Ihme, M., Pitsch, H., Bodony, D. 2009; 32: 1545-1553

  View details for DOI 10.1016/j.proci.2008.06.137

  View details for Web of Science ID 000264756800178

• Prediction of extinction and reignition in nonpremixed turbulent flames using a flamelet/progress variable model 1. A priori study and presumed PDF closure COMBUSTION AND FLAME Ihme, M., Pitsch, H. 2008; 155 (1-2): 70-89

  View details for DOI 10.1016/j.combustflame.2008.04.001

  View details for Web of Science ID 000260362400006

• Prediction of extinction and reignition in nonpremixed turbulent flames using a flamelet/progress variable model 2. Application in LES of Sandia flames D and E COMBUSTION AND FLAME Ihme, M., Pitsch, H. 2008; 155 (1-2): 90-107

  View details for DOI 10.1016/j.combustflame.2008.04.015

  View details for Web of Science ID 000260362400007

• Modeling of radiation and nitric oxide formation in turbulent nonpremixed flames using a flamelet/progress variable formulation PHYSICS OF FLUIDS Ihme, M., Pitsch, H. 2008; 20 (5)

  View details for DOI 10.1063/1.2911047

  View details for Web of Science ID 000256304800032

• Generation of optimal artificial neural networks using a pattern search algorithm: Application to approximation of chemical systems NEURAL COMPUTATION Ihme, M., Marsden, A. L., Pitsch, H. 2008; 20 (2): 573-601

  Abstract

  A pattern search optimization method is applied to the generation of optimal artificial neural networks (ANNs). Optimization is performed using a mixed variable extension to the generalized pattern search method. This method offers the advantage that categorical variables, such as neural transfer functions and nodal connectivities, can be used as parameters in optimization. When used together with a surrogate, the resulting algorithm is highly efficient for expensive objective functions. Results demonstrate the effectiveness of this method in optimizing an ANN for the number of neurons, the type of transfer function, and the connectivity among neurons. The optimization method is applied to a chemistry approximation of practical relevance. In this application, temperature and a chemical source term are approximated as functions of two independent parameters using optimal ANNs. Comparison of the performance of optimal ANNs with conventional tabulation methods demonstrates equivalent accuracy by considerable savings in memory storage. The architecture of the optimal ANN for the approximation of the chemical source term consists of a fully connected feedforward network having four nonlinear hidden layers and 117 synaptic weights. An equivalent representation of the chemical source term using tabulation techniques would require a 500 x 500 grid point discretization of the parameter space.

  View details for PubMedID 18045024

• Prediction of extinction and reignition in non-premixed turbulent flames using a flamelet/progress variable model 2. Application in LES of Sandia Flames D and E. Combustion and Flame Ihme, M., Pitsch, H. 2008; 155: 90-107
• Modeling of radiation and nitric oxide formation in turbulent nonpremixed flames using a flamelet/progress variable formulation. Physics of Fluids Ihme, M., Pitsch, H. 2008; 20: 055110
• Large-eddy simulation of turbulent reacting flows. Progress in Aerospace Sciences Pitsch, H., Desjardins, O., Balarac, G., Ihme, M. 2008; 6 (44): 466-478
• Construction of optimal artificial neural networks for tabulated chemistry using a pattern search algorithm. Ihme, M., Pitsch, H. 2008
• Prediction of extinction and reignition in non-premixed turbulent flames using a flamelet/progress variable model 1. A priori study and presumed PDF closure. Combustion and Flame Ihme, M., Pitsch, H. 2008; 155: 70-89
• Generation of optimal artificial neural networks using a pattern search algorithm: Application to approximation of chemical systems. Neural Computation Ihme, M., Marsden, A., L., Pitsch, H. 2008; 20: 573–601
• On the optimization of artificial neural networks for application to the approximation of chemical systems. Center for Turbulence Research Annual Research Briefs Ihme, M., Marsden, A., L., Pitsch, H. 2006: 105–118
• Towards the prediction of combustion-generated noise in non-premixed turbulent flames using large-eddy simulation. Center for Turbulence Research Annual Research Briefs Ihme, M., Bodony, D., Pitsch, H. 2005: 311–323
• Prediction of local extinction and re-ignition effects in non-premixed turbulent combustion using a flamelet/progress variable approach 30th International Symposium on Combustion Ihme, M., Cha, C. M., Pitsch, H. ELSEVIER SCIENCE INC. 2005: 793–800

  View details for DOI 10.1016/j.proci.2004.08.260

  View details for Web of Science ID 000229944200083

• Stochastic mixing model with power law decay of variance PHYSICAL REVIEW E Fedotov, S., Ihme, M., Pitsch, H. 2005; 71 (1)

  Abstract

  A stochastic mixing model based on the law of large numbers is presented that describes the decay of the variance of a conserved scalar in decaying turbulence as a power law, sigma2(c) proportional t(-alpha). A general Lagrangian mixing process is modeled by a stochastic difference equation where the mixing frequency and the ambient concentration are random processes. The mixing parameter lambda is introduced as a coefficient in the mixing frequency in order to account for initial length-scale ratio of the velocity and scalar field and other physical dependencies. We derive a nonlinear integral equation for the probability density function (pdf) of a conserved scalar that describes the relaxation of an arbitrary initial distribution to a delta-function. Numerical studies of this equation are conducted, and it is shown that lambda has a distinct influence on the decay rate of the scalar. Results obtained from the model for the evolution of the pdf are in a good agreement with direct numerical simulation (DNS) data.

  View details for DOI 10.1103/PhysRevE.71.016310

  View details for Web of Science ID 000227459400087

  View details for PubMedID 15697725

• Stochastic mixing model with power law decay of variance. Physical Review E Fedotov, S., Ihme, M., Pitsch, H. 2005; 1 (71): 1–9
• Numerical prediction of nitrogen oxide emission using flamelet/progress variable model. Ihme, M., Pitsch, H. 2005
• LES of a non-premixed flame using an extended flamelet/progress variable model. Ihme, M., Pitsch, H. 2005
• Flamelet/progress variable model closure with statistically mostlikely distribution. Ihme, M., Pitsch, H. 2005
• An unsteady/flamelet progress variable method for LES of nonpremixed turbulent combustion. Pitsch, H., Ihme, M. 2005
• Prediction of local extinction and re-ignition effects in non-premixed turbulent combustion using a flamelet/progress variable approach. Ihme, M., Cha, C., M., Pitsch, H. 2005
• An extended flamelet/progress variable method for LES of nonpremixed turbulent combustion. Ihme, M., Pitsch, H. 2004
• Stochastic mixing model with power law decay of variance. Center for Turbulence Research Annual Research Briefs Fedotov, S., Ihme, M., Pitsch, H. 2003: 285–296