Computational prediction of aerodynamic noise induced by a fan in semi-closed space

Abstract

Numerical simulations of aerodynamic noise by a hybrid method of combining large eddy simulation (LES) and the Lighthill’s acoustic analogy are expected to be used as a development tool for low noise products. In the present paper, the Lighthill dipole source introduced by Green’s theorem is applied to predict aerodynamics noise induced by a fan in semi-closed space, e.g. cooling fan of motor. The present method enables efficient sampling of Lighthill quadrupole source in a rotational region. The simulation results for the sound spectra show good agreement with the experimental results.