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Numerical study of pressure and velocity fluctuations in nearly isotropic turbulence

Published online by Cambridge University Press:  19 April 2006

U. Schumann  and
G. S. Patterson
U. Schumann
Affiliation:
Institut für Reaktorentwicklung, Kernforschungszentrum Karlsruhe, 7500 Karlsruhe, Postfach 3640, West Germany
G. S. Patterson
Affiliation:
National Center for Atmospheric Research, Boulder, Colorado 80307
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Abstract

The spectral method of Orszag & Patterson has been extended to calculate the static pressure fluctuations in incompressible homogeneous decaying turbulence at Reynolds numbers Reλ [lsim ] 35. In real space 323 points are treated. Several cases starting from different isotropic initial conditions have been studied. Some departure from isotropy exists owing to the small number of modes at small wavenumbers. Root-mean-square pressure fluctuations, pressure gradients and integral length scales have been evaluated. The results agree rather well with predictions based on velocity statistics and on the assumption of normality. The normality assumption has been tested extensively for the simulated fields and found to be approximately valid as far as fourth-order velocity correlations are concerned. In addition, a model for the dissipation tensor has been proposed. The application of the present method to the study of the return of axisymmetric turbulence to isotropy is described in the companion paper.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 88 , Issue 4 , 27 October 1978 , pp. 685 - 709
Copyright
© 1978 Cambridge University Press

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