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Effect of rotation on isotropic turbulence: computation and modelling

Published online by Cambridge University Press:  20 April 2006

Jorge Bardina ,
J. H. Ferziger  and
R. S. Rogallo
Jorge Bardina
Affiliation:
Department of Mechanical Engineering, Stanford University, Stanford, CA Present address: PEDA Corporation, Palo Alto, CA.
J. H. Ferziger
Affiliation:
Department of Mechanical Engineering, Stanford University, Stanford, CA
R. S. Rogallo
Affiliation:
NASA-Ames Research Center, Moffett Field, CA
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Abstract

This paper uses numerical simulation to analyse the effects of uniform rotation on homogeneous turbulence. Both large-eddy and full simulations were made. The results indicate that the predominant effect of rotation is to decrease the rate of dissipation of the turbulence and increase the lengthscales, especially those along the axis of rotation. These effects are a consequence of the reduction, due to the generation of inertial waves, of the net energy transfer from large eddies to small ones. Experiments are also influenced by a more complicated interaction between the rotation and the wakes of the turbulence-generating grid which modifies the nominal initial conditions in the experiment. The latter effect is accounted for in simulations by modifying the initial conditions. Finally, a two-equation model is proposed that accounts for the effects of rotation and is able to reproduce the experimental decay of the turbulent kinetic energy.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 154 , May 1985 , pp. 321 - 336
Copyright
© 1985 Cambridge University Press

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