Wavenumber-frequency characteristics of pressure fluctuations associated with separating vortices

N. H. Mostafa, M. R. Hajj, M. D. Zeiger, S. A. Ragab

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

Abstract

Local wavenumber/frequency characteristics of pressure fluctuations associated with two types of vortex separation over a prism are examined. The first vortex is a spanwise vortex associated with the separation formed by normal flow over a prism. The second vortex is a conical vortex formed by the separation of a flow at 45°to two sides of the prism. The technique used to estimate the wavenumber-frequency spectra uses pressure measurements from two taps. For the spanwise vortex, the measurements show that low frequencies and small wavenumbers dominate the pressure fluctuations. Further downstream, the energy is reduced and distributed to a wide range of frequencies and wavenumbers. As for the conical vortex, most of the energy is confined to low frequencies and wavenumbers. Wavenumber spectra for the pressure fluctuations are also presented.

Original languageEnglish
Title of host publicationProceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM)
Pages1
Number of pages1
StatePublished - 1999

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