International Journal of Fluid Mechanics Research

ISSN for PRINT: 1064-2277

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2006, Volume33

Issue 4

92 pages

DOI: 10.1615/InterJFluidMechRes.v33.i4

Issue price - $310.00

A. O. Borisyuk
Institute of Hydromechanics of the National Academy of Sciences of Ukraine, Zhelyabov Str., 8/4, 03680, Kyiv-180, MSP, Ukraine

Wall pressure fluctuations p_t in an elastic pipe behind a local axisymmetric narrowing are studied. Sharp increase in the pressure p_t in a finite region immediately downstream the narrowing and the presence of a pronounced pressure maximum upstream the point of jet re-attachment were found. The study of the wall pressure power spectrum, P(f), has revealed the low-frequency maximums in it. The maximums were found to be determined by the appropriate large-scale eddy structures in the regions of separated and reattached flow, and their frequencies were close to the characteristic frequencies of the eddies formation. A comparative analysis of the data for rigid-walled and elastic pipes shows that the wall elasticity causes the changes in the flow structure and the corresponding redistribution of the flow energy among the vortices. This results in the increase of the wall pressure amplitude and the level of the wall pressure power spectrum, P(f), at low frequencies, as well as appearance of new frequency components in this domain.

DOI: 10.1615/InterJFluidMechRes.v33.i4.60 Download article, 379-389 pages

Article price - $40.00

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