Abstract
We develop a complex-ray approach to the calculation of high-frequency flow-interaction effects for 3D jet engine noise in a moving media obeying the Lilley equation. The method copes with caustics, complex rays and the multiplicity of ray solutions. Excellent agreement with modal and numerical solutions is achieved. For off -axis point sources, the solution fi eld is rich in the canonical, but easily calculable, caustic structures of catastrophe theory. The result is some unexpected bad news on jet noise for a certain distinguished resident of Windsor.
Co-authors: Jon Stone, Rod Self (ISVR Southampton)