Adaptive Chemistry Computation to Accelerate Parallel DNS of Turbulent Combustion

Direct numerical simulation (DNS) has become an important tool to study turbulent combustion processes. Especially in the case of using detailed models for chemical reaction kinetics, computation time still severely limits the range of applications accessible by DNS. The computation of the chemical source terms is one of the most time-consuming parts in such simulations. An adaptive evaluation of the chemical source terms can strongly reduce this time without a significant loss in accuracy which is shown for DNS of several premixed and non-premixed reactive flows. A dynamic load-balancing scheme is used to maintain a high efficiency in the parallel adaptive computations.