Hybrid Aeroacoustic Simulation of EAA’s Axial Fan Benchmark (online)

* Presenting author
Day / Time: 23.03.2022, 10:40-11:00
Room: 9-0208
Typ: Vortrag (strukturierte Sitzung)
Online-access: Bitte loggen Sie sich ein, damit weitere Inhalte sichtbar werden (bspw. der Zugang zur Onlinesitzung).

The accurate and efficient numerical simulation of fan noise is a challenging task. It requires a proper treatment of motion, turbulence, sound propagation and the boundary conditions. On the acoustics side, hybrid simulation approaches, that couple an incompressible flow simulation with a convective wave equation, offer a well-established solution for low-speed aeroacoustics. On the flow side, wall-modeled Large Eddy Simulation (WMLES) is a promising method to obtain transient fluctuations at reasonable computational costs. A hybrid simulation that combines these two aspects within the second order finite volume framework of Simcenter STAR-CCM+, is demonstrated on the EAA benchmark case of a wall mounted Axial Fan. An automated workflow employs a pre-cursor steady state Reynolds Averaged Navier Stokes (RANS) phase followed by a transient, WMLES analysis. The rotation of the fan in the transient phase, is modeled using rigid body motion. A perturbed convective wave equation is simultaneously solved on the same mesh and considers the aeroacoustic sources within the whole computational domain. The simulation methodology is validated against experimental data, showing good agreement. Furthermore, the importance of accurate boundary conditions and interface treatment, between the rotating and stationary domains, are illustrated.