A Hydrodynamic/Acoustic Splitting Method with Fluid-structure Feedback for Flowinduced Noise

A hydrodynamic/acoustic splitting (HAS) method is presented to simulate flow-induced noise in fluid-structure-sound interactions. This method consists of hydrodynamic governing equations and acoustic perturbed equations. The hydrodynamic governing equations are solved by wavelet immersed boundary method (IBM) to calculate fluid and structure fields, which will affect the acoustic propagation. The acoustic perturbed equations are computed by a dispersion-relation-preserving (DRP) difference scheme, as well as a low-dissipation and low-dispersion Runge-Kutta (LDDRK) scheme to acquire the acoustic field precisely. In addition, perfectly matched layers (PML) are constructed by PML governing equations to form no-reflective boundary conditions in the acoustic computation. Finally, two numerical examples, which include sound generation by flow over a cylinder or two parallel cylinders, are calculated to validate the new method is a simple and efficient method for fluid-structuresound interactions.