The present research is focussed on improving the liquid fuel atomization process and to increase fuel-air mixing downstream of the fuel injector in advanced gas turbine combustors. Since fuel atomization and fuel-air mixing are both highly unsteady, conventional steady state methods cannot be used to elucidate the finer details. The details of the LES equations and the subgrid closure employed have been reported in the cited papers and therefore, are avoided here for brevity. Thus, ad hoc subgrid models for the scalar field cannot be used. The method has also been further refined and used to study vaporization and the subsequent chemical reactions.
More details are in the cited papers.
In the present implementation, the partitioning scheme results in each processor performing computations only on the cells held by it. This exchange is carried out using a few relatively long messages. As a result, the high cost of latency associated with message passing is minimized, resulting in a reduced communication overhead even though this data exchange results in an increased memory overhead. The implementation of the subgrid combustion model within the LES method is relatively straightforward since the subgrid model resides within the LES cells and requires no inter-cell communication for the local subgrid processes. However, inter-processor communication is needed every LES time step to transport the subgrid scalar field across LES cell surfaces.