Jian An  , Guoqiang He  , Fei Qin  , Xianggeng Wei  , Duo Zhang

DOI Number XXX-YYY-ZZZ

Conference Number HiSST 2018-909

To deal with the major challenges of combustion simulation with detailed chemical kinetics, dynamic adaptive chemistry (DAC) method and In Situ Adaptive Tabulation (ISAT) method were introduced to accelerate numerical calculation in supersonic turbulent combustion flows. The proposed methods were validated in a hydrogen fueled model scramjet combustor (DLR) with 9 species and 27 reactions, and a total of eight cases with different threshold values using large eddy simulation were set. Compared to the case without any acceleration method, the results indicate that the two proposed methods can accurately capture the flame structure, and that the relative percentage errors of temperature and species concentration are well-controlled and proportional to the threshold values. As for performance, detailed diagnostics show that DAC and ISAT with different threshold values reduce the computational overhead of ODE integration by factors of 1.4 to 1.71 and 2.1 to 4.0, respectively. The successful validation demonstrates that the two proposed methods can be efficiently used in the simulation of supersonic reactive flow for detailed kinetic mechanisms.

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In Categories: HiSST 2018, Hypersonic Aerodynamics, Materials and Structures, Testing and Evaluation, Transition to Turbulence, Turbulence Modeling and Simulation
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