Advanced aeroacoustics based on hydrodynamic / acoustic separation

The objective of the present work is to deepen the understanding of hydrodynamic/acoustic separation (HAS) approaches in hybrid computer aided aeroacoustics (CAA) at low Mach numbers. The basic idea and characteristics of the HAS approach are explored. Here, the focus is on pretical modes and their influence.

In hybrid CAA, source data must be transferred between flow and acoustic models. The work shows that the HAS approach is insensitive to spatial errors, but appropriate temporal reconstruction is critical. Problems can arise with different sizes of flow and acoustic domains, and existing handling approaches are not always adequate. Therefore, a novel strategy to continue the flow pressure field into the outer acoustic propagation domain is proposed.