Rotorcraft aeroacoustics computations with overset-grid CFD methods

摘要

This paper describes a new method for computing the flowfield and acoustic signature of arbitrary rotors in forward flight. The overall scheme solves the Navier-Stockes equations on a system of overset grids. These grids allow for prescribed cyclic and Flapping blade motions and capture the interactions between the rotor blades and wake. The far-field noise is computed with An acoustic integral over a surface that completely encloses the rotor blades. Interpolations onto this acoustic surface use the Same overset-grid techniques that are used for the flowfield solution.