Aerodynamic noise radiated from low Mach number turbulent wake of a circular cylinder has been numerically predicted by the following two-step approach.

First, the three dimensional unsteady incompressible Navier-Stokes equations are solved by the large eddy Simulation (LES) technique using a newly proposed streamline upwind finite element method. The far field sound pressure is then calculated from the fluctuating surface pressure on the cylinder, based on the Lighthill-Curle's equation. A sophisticated method has been proposed for computing sound pressure level (SPL) radiated from the whole span of the cylinder using the surface pressure fluctuation obtained in a small spanwise computational domain. The method takes the effects of the random phase shift of the surface pressure fluctuation into account. The predicted SPL is compared with the measured value. A fairly good agreement has been achieved between the predicted and measured SFL's for the peak spectrum intensity and the frequency dependency of the SFL up to about ten times higher than the peak frequency.