Abstract
A ray acoustics approach to flow effects on acoustics scattering is considered, based on a combination of geometrical acoustics and the paraxial ray approximation. The approach allows for scattering by objects of arbitrary shapes, inhomogeneous and moving media. Applications to flow effects on scattering include the effect of a wall shear layer on scattering from a cylindrical shaped fuselage and the effects of an incompressible inviscid flow on the directivity pattern of the scattered field from a cylinder and a Rankine body. It has been found that the flow causes a modification and displacement of the lobes of the directivity pattern and the shadow zone of the scattered field, which can be important at Mach numbers greater than 0·2.
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