A sharp interface immersed boundary method for flow-induced noise prediction using acoustic perturbation equations

In this paper, a hybrid computational aero/hydro-acoustic approach is proposed to deal with acoustic scattering and flow-induced noise problems based on the sharp interface immersed boundary method (IBM). For flow field, incompressible Navier–Stokes equations are solved by an in-house direct numerical simulation solver. The field predicted solving perturbation (APEs). Both solid boundaries complexity mobility dealt IBM. Benchmark varied scatterers in two three dimensions presented validate accuracy of codes treatments. Then, feasibility present validated considering problem past circular cylinder at Reynolds number 200. Subsequently, used predict generated around four-cylinder array two-dimensions arrangements (i.e., square diamond array), physics investigated detail. results show that retains monopole-like sound-radiation shape, while directivity pattern produces dipole-like shape. both arrays, propagation waves affected Doppler effect, latter larger alternation angle compared single due influence geometric configuration. intensity radiated pressure much greater for one most circumferential directions, arrays than cylinder. spectrums far-field indicate have similar peak frequencies profiles, vortex shedding playing predominant role generation all configurations.