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Cut-on, cut-off transition of sound in slowly varying flow ducts. (English) Zbl 0996.76079
Summary: We study the cut-on/cut-off transition of a slowly varying acoustic mode in a slowly varying hard-walled duct with irrotational isentropic mean flow. The usual turning point behaviour is found.
Reviewer: Reviewer (Berlin)

##### MSC:
 76Q05 Hydro- and aero-acoustics