Anti-Aliasing 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 LargeEddy Simulations (LES). These separate flow solvers run simultaneously and exchange information at the interface. However, since the LES flow solver operates usually with a much smaller time-step, the LES data has to be sampled in order to provide data for the RANS flow solver. In the sampling process aliasing errors can occur. This study investigates possibilities in order to suppress aliasing errors while preserving the amplitude and phase of the long wave spectrum.