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Time correlations of pressure in isotropic turbulence

Huadong Yao (Institutionen för tillämpad mekanik, Strömningslära) ; Guo-Wei He ; Meng Wang ; Xing Zhang
Physics of Fluids (1070-6631). Vol. 20 (2008), 025105,
[Artikel, refereegranskad vetenskaplig]

The time correlations of pressure modes in stationary isotropic turbulence are investigated under the Kraichnan and Tennekes “random sweeping” hypothesis. A simple model is obtained which predicts a universal form for the time correlations. It implies that the decorrelation process of pressure fluctuations in time is mainly dominated by the sweeping velocity, and the pressure correlations have the same decorrelation time scales as the velocity correlations. These results are verified using direct numerical simulations of isotropic turbulence at two moderate Reynolds numbers; the mode correlations collapse to the universal form when the time separations are scaled by wavenumber times the sweeping velocity, and the ratios of the correlation coefficients of pressure modes to those of velocity modes are approximately unity for the entire range of time separation.



Denna post skapades 2014-09-18.
CPL Pubid: 202906

 

Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Strömningslära

Ämnesområden

Strömningsmekanik

Chalmers infrastruktur