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Simulation of spatially evolving turbulence and the applicability of Taylor's hypothesis in compressible flowFor the numerical simulation of inhomogeneous turbulent flows, a method is developed for generating stochastic inflow boundary conditions with a prescribed power spectrum. Turbulence statistics from spatial simulations using this method with a low fluctuation Mach number are in excellent agreement with the experimental data, which validates the procedure. Turbulence statistics from spatial simulations are also compared to those from temporal simulations using Taylor's hypothesis. Statistics such as turbulence intensity, vorticity, and velocity derivative skewness compare favorably with the temporal simulation. However, the statistics of dilatation show a significant departure from those obtained in the temporal simulation. To directly check the applicability of Taylor's hypothesis, space-time correlations of fluctuations in velocity, vorticity, and dilatation are investigated. Convection velocities based on vorticity and velocity fluctuations are computed as functions of the spatial and temporal separations. The profile of the space-time correlation of dilatation fluctuations is explained via a wave propagation model.
Document ID
19920061737
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lee, Sangsan
(NASA Ames Research Center Moffett Field, CA, United States)
Lele, Sanjiva K.
(Stanford University CA, United States)
Moin, Parviz
(Stanford University; NASA, Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 15, 2013
Publication Date
July 1, 1992
Publication Information
Publication: Physics of Fluids A
Volume: 4
Issue: 7, Ju
ISSN: 0899-8213
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
92A44361
Distribution Limits
Public
Copyright
Other

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