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Improved turbulence models based on large eddy simulation of homogeneous, incompressible turbulent flowsThe physical bases of large eddy simulation and subgrid modeling are studied. A subgrid scale similarity model is developed that can account for system rotation. Large eddy simulations of homogeneous shear flows with system rotation were carried out. Apparently contradictory experimental results were explained. The main effect of rotation is to increase the transverse length scales in the rotation direction, and thereby decrease the rates of dissipation. Experimental results are shown to be affected by conditions at the turbulence producing grid, which make the initial states a function of the rotation rate. A two equation model is proposed that accounts for effects of rotation and shows good agreement with experimental results. In addition, a Reynolds stress model is developed that represents the turbulence structure of homogeneous shear flows very well and can account also for the effects of system rotation.
Document ID
19840009460
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Bardino, J.
(Stanford Univ. CA, United States)
Ferziger, J. H.
(Stanford Univ. CA, United States)
Reynolds, W. C.
(Stanford Univ. CA, United States)
Date Acquired
September 4, 2013
Publication Date
May 1, 1983
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NASA-CR-166541
SU-TF-19
NAS 1.26:166541
Accession Number
84N17528
Funding Number(s)
CONTRACT_GRANT: NCC2-15
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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