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Space/time characteristics of pressure fluctuations in separation regions
Faculty
Not Specified
Year:
2002
Type of Publication:
Article
Pages:
415-426
Authors:
Mostafa, NH, Hajj, MR, Zeiger, MD, Ragab, SA
DOI:
10.1016/S0167-6105(01)00217-3
Journal:
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS ELSEVIER SCIENCE BV
Volume:
90
Research Area:
Engineering; Mechanics
ISSN
ISI:000176456500013
Keywords :
wavenumber/frequency spectra, space/time pressure fluctuations, separation regions
Abstract:
Local wavenumber/frequency characteristics of pressure fluctuations associated with two types of flow separation over the roof of a surface-mounted prism are examined. The first type is the separation formed by a flow normal to one side of the prism. In this separation region, the flow is highly unsteady and reattachment takes place intermittently at varying locations. The second type is the separation formed by a flow at 45degrees to two sides of the prism. In this separation, two conical vortices form over the prism. Frequency analysis of the surface pressure fluctuations shows broadband spectra at many locations under both types of separation regions. The local wavenumber-frequency spectrum is estimated by using pressure measurements from two taps. In both separation regimes, the measurements show that, at the onset of separation, low frequencies and small wavenumbers dominate the surface pressure fluctuations. Further downstream, where intermittent reattachment or vortex breakdown takes place, the level of energy of the high frequency and large wavenumbers increases. Local wavenumber spectra for the pressure fluctuations are also presented and discussed. (C) 2002 Elsevier Science Ltd. All rights reserved.
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