Effects of pressure gradient on higher order statistics in turbulent boundary layers

Z. Harun, I. Marusic, J. P. Monty, R. Mathis

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

This paper investigates the effect and influence of pressure gradient on the skewness and flatness in turbulent boundary layers, which are subjected to adverse, zero and favourable pressure gradients. The large scale features are found to increase the skewness in the near wall-region for adverse pressure gradients in a manner similar to the effect of changing Reynolds number as documented by Metzger & Klewicki [1] for zero pressure gradient flows. The skewness is expanded by decomposing the fluctuating velocities into small and large-scale components, u+ = u+L + u+S , and the individual terms are compared. The large-scale term, u+3L /(u2)3/2, and the cross product term, 3u+L u+2S /(u2)3/2, are found to be the major contributors for the skewness factors and change drastically with pressure gradient. Further, it is found that the cross product term could replace the amplitude modulation method proposed by Mathis et al (2009) [2] in turbulence boundary layer flows with pressure gradient.

Original languageEnglish
Pages (from-to)2101-2112
Number of pages12
JournalProceedings of the International Symposium on Turbulence, Heat and Mass Transfer
Volume2012-September
DOIs
Publication statusPublished - 1 Jan 2012
Event7th International Symposium On Turbulence, Heat and Mass Transfer, THMT 2012 - Palermo, Italy
Duration: 24 Sep 201227 Sep 2012

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Higher order statistics
Pressure gradient
Boundary layers
Amplitude modulation
Boundary layer flow
Reynolds number
Turbulence

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

Cite this

Effects of pressure gradient on higher order statistics in turbulent boundary layers. / Harun, Z.; Marusic, I.; Monty, J. P.; Mathis, R.

In: Proceedings of the International Symposium on Turbulence, Heat and Mass Transfer, Vol. 2012-September, 01.01.2012, p. 2101-2112.

Research output: Contribution to journalConference article

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