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INTERACTION BETWEEN CHEMISTRY AND MICRO-MIXING MODELING IN TRANSPORTED PDF SIMULATIONS OF TURBULENT NON-PREMIXED FLAMES

A comparative study is presented of the impact of chemistry modeling on the behavior of 2 micro-mixing models in transported scalar PDF simulations of turbulent non-premixed flames. The micro-mixing models are CD (modified Curl's Coalescence/Dispersion) and EMST (Euclidean Minimum Spanning Tree). A first order non-linear k-ε turbulence model is applied for the turbulent flow and mixing fields. Three C1 chemistry models are considered: 2 skeletal schemes containing 16 species and 31, resp. 41 elementary reactions, and one augmented reaction scheme (ARM), consisting of 9 independent species and 5 global reaction steps. The test cases considered are the piloted turbulent Delft Flame III jet diffusion flame and the bluff-body stabilized turbulent non-premixed Sydney HM1 flame. With EMST the chemistry model choice has a negligible effect on the micro-mixing model behavior or on the results in physical space. With CD on the other hand, larger differences appear.