SOLUTION OF THE PARALLEL SHEAR LAYER GREEN'S FUNCTION USING CONSERVATION EQUATIONS

摘要

A parallel shear flow representative of a jet is a standard way to solve for the wave propagation terms in jet noise modelling using the acoustic analogy. In this paper the author shows by introducing a new primary Green's function variable, proportional to the convective derivative of the pressure-like Green's function, the wave propagation equations reduce to an exact conservation form that does not include any derivatives of the mean flow. The author analyzes this Green's function variable numerically and shows its utility when the mean flow is defined by a CFD solution and known only at a discrete set of points.