TY - JOUR
T1 - Wall-modeled large-eddy simulation of autoignition-dominated supersonic combustion
AU - Candler, Graham V.
AU - Cymbalist, Niccolo
AU - Dimotakis, Paul E.
PY - 2017
Y1 - 2017
N2 - Simulations of combustion in high-speed and supersonic flows need to account for autoignition phenomena, compressibility,andtheeffectsofintenseturbulence.Inthepresentwork,theevolution-variablemanifoldframework of Cymbalist and Dimotakis ("On Autoignition-Dominated Supersonic Combustion," AIAA Paper 2015-2315, June 2015) is implemented in a computational fluid dynamics method, and Reynolds-averaged Navier-Stokes and wall-modeled large-eddy simulations are performed for a hydrogen-air combustion test case. As implemented here, the evolution-variable manifold approach solves a scalar conservation equation for a reaction-evolution variable that represents both the induction and subsequent oxidation phases of combustion. The detailed thermochemical state of thereactingfluidistabulatedasalow-dimensionalmanifoldasafunctionofdensity,energy,mixturefraction,andthe evolution variable. A numerical flux function consistent with local thermodynamic processes is developed, and the approach for coupling the computational fluid dynamics to the evolution-variable manifold table is discussed. Wall-modeled large-eddy simulations incorporating the evolution-variable manifold framework are found to be in good agreement with full chemical kinetics model simulations and the jet in supersonic crossflow hydrogen-air experimentsofGambaandMungal("Ignition,FlameStructureandNear-WallBurninginTransverseHydrogenJets in Supersonic Crossflow," Journal of Fluid Mechanics, Vol. 780, Oct. 2015, pp. 226-273). In particular, the evolutionvariable manifold approach captures both thin reaction fronts and distributed reaction-zone combustion that dominate high-speed turbulent combustion flows.
AB - Simulations of combustion in high-speed and supersonic flows need to account for autoignition phenomena, compressibility,andtheeffectsofintenseturbulence.Inthepresentwork,theevolution-variablemanifoldframework of Cymbalist and Dimotakis ("On Autoignition-Dominated Supersonic Combustion," AIAA Paper 2015-2315, June 2015) is implemented in a computational fluid dynamics method, and Reynolds-averaged Navier-Stokes and wall-modeled large-eddy simulations are performed for a hydrogen-air combustion test case. As implemented here, the evolution-variable manifold approach solves a scalar conservation equation for a reaction-evolution variable that represents both the induction and subsequent oxidation phases of combustion. The detailed thermochemical state of thereactingfluidistabulatedasalow-dimensionalmanifoldasafunctionofdensity,energy,mixturefraction,andthe evolution variable. A numerical flux function consistent with local thermodynamic processes is developed, and the approach for coupling the computational fluid dynamics to the evolution-variable manifold table is discussed. Wall-modeled large-eddy simulations incorporating the evolution-variable manifold framework are found to be in good agreement with full chemical kinetics model simulations and the jet in supersonic crossflow hydrogen-air experimentsofGambaandMungal("Ignition,FlameStructureandNear-WallBurninginTransverseHydrogenJets in Supersonic Crossflow," Journal of Fluid Mechanics, Vol. 780, Oct. 2015, pp. 226-273). In particular, the evolutionvariable manifold approach captures both thin reaction fronts and distributed reaction-zone combustion that dominate high-speed turbulent combustion flows.
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U2 - 10.2514/1.J055550
DO - 10.2514/1.J055550
M3 - Article
AN - SCOPUS:85021785724
SN - 0001-1452
VL - 55
SP - 2410
EP - 2423
JO - AIAA journal
JF - AIAA journal
IS - 7
ER -