Antialiasing filters for coupled Reynolds-averaged/large-eddy simulations

The increasing complexity of engineering problems makes the coupling of multiple simulation codes attractive. In fluid mechanical applications, the physical range of flow phenomena that can be modeled can be extended significantly by coupling flow solvers based on the Reynolds-averaged Navier–Stokes (RANS) approach and on large-eddy simulations (LES). These separate flow solvers run simultaneously and exchange information at the interface. However, because the LES flow solver operates usually with a much smaller time step, the LES data have to be sampled to provide data for the RANS flow solver. In the sampling process, aliasing errors can occur. Possibilities are investigated to suppress aliasing errors while preserving the amplitude and phase of the long wave spectrum.