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Statistics of pressure and pressure gradient in homogeneous isotropic turbulenceThe statistics of pressure and pressure gradient in stationary isotropic turbulence are measured within direct numerical simulations at low to moderate Reynolds numbers. It is found that the one-point pdf of the pressure is highly skewed and that the pdf of the pressure gradient is of stretched exponential form. The power spectrum of the pressure P(k) is found to be larger than the corresponding spectrum P(sub G)(k) computed from a Gaussian velocity field having the same energy spectrum as that of the DNS field. The ratio P(k)/P(sub G)(k), a measure of the pressure-field intermittence, grows with wavenumber and Reynolds number as -R(sub lambda)(exp 1/2)log(k/k(sub d)) for k less than k(sub d)/2 where k(sub d) is the Kolmogorov wavenumber. The Lagrangian correlations of pressure gradient and velocity are compared and the Lagrangian time scale of the pressure gradient is observed to be much shorter than that of the velocity.
Document ID
19950014629
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Gotoh, T. (Nagoya Inst. of Tech. Japan)
Rogallo, R. S. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1994
Publication Information
Publication: Stanford Univ., Studying Turbulence Using Numerical Simulation Databases. 5: Proceedings of the 1994 Summer Program
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
95N21046
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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