High-resolution LES of a starting jet

Two parameters, namely the mixture fraction and its dissipation rate, are chosen for the statistical evaluation, which is presented for both the calculation and the experiment. It is clear that the initial/boundary conditions influence the flow dynamics, thus considerable differences in the statistics can be observed. The comparison of the resolved scales shows that the simulation resolves structures smaller than those from the experiment by a factor of two. However, this does not lead to the discrepancy of the numerical and experimental statistics, which is independent of the resolution. It is observed that the high scalar dissipation rate (SDR) values are mainly located in the mixing layer, however the vortex ring is occupied by the considerably lower SDR values.