A model is developed which contributes to the understanding of the scattering in the presence of moving objects and space- and time- dependent moving media. The model is restricted to irrotational flows, neglects velocity effects except of the first order in the Mach number, and assumes slow variations in the ambient medium. These restrictions facilitate the analytical discussion of specific canonical problems. The study indicates that Doppler effects can be produced by moving scatterers in a medium at rest, scatterers at rest in a moving medium, and in configurations in which combined motion of scatterers and media take place. The Doppler effects are of the same order of magnitude in all cases. This vindicates the simple models used for research and applications, which assume that the moving objects produce Doppler effects but neglect the flow of the surrounding medium.
|Number of pages||2|
|State||Published - 1 Dec 1987|
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