Scaling of pressure spectrum in turbulent boundary layers

Patwardhan, Saurabh S and Ramesh, ON (2014) Scaling of pressure spectrum in turbulent boundary layers. In: 1st Multiflow Summer Workshop on Turbulence, JUN 10-JUL 12, 2013, Univ Politecnica Madrid, Sch Aeronaut, Madrid, SPAIN.

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Abstract

Scaling of pressure spectrum in zero-pressure-gradient turbulent boundary layers is discussed. Spatial DNS data of boundary layer at one time instant (Re-theta = 4500) are used for the analysis. It is observed that in the outer regions the pressure spectra tends towards the -7/3 law predicted by Kolmogorov's theory of small-scale turbulence. The slope in the pressure spectra varies from -1 close to the wall to a value close to -7/3 in the outer region. The streamwise velocity spectra also show a -5/3 trend in the outer region of the flow. The exercise carried out to study the amplitude modulation effect of the large scales on the smaller ones in the near-wall region reveals a strong modulation effect for the streamwise velocity, but not for the pressure fluctuations. The skewness of the pressure follows the same trend as the amplitude modulation coefficient, as is the case for the velocity. In the inner region, pressure spectra were seen to collapse better when normalized with the local Reynolds stress (-(u'v') over bar) than when scaled with the local turbulent kinetic energy (q(2) = (u'(2)) over bar + (v'(2)) over bar + (w'(2)) over bar)

Item Type:	Conference Proceedings
Series.:	Journal of Physics Conference Series
Publisher:	IOP PUBLISHING LTD
Additional Information:	copyright for this article belongs to IOP PUBLISHING LTD, DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	24 Jun 2014 07:40
Last Modified:	24 Jun 2014 07:40
URI:	http://eprints.iisc.ac.in/id/eprint/49329

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