Journal of Fluid Mechanics



Evaluation of subgrid-scale models using an accurately simulated turbulent flow


Robert A.  Clark a1, Joel H.  Ferziger a2 and W. C.  Reynolds a2
a1 Group TD-5, Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87544
a2 Department of Mechanical Engineering, Stanford University, Stanford, California 94305

Article author query
clark ra   [Google Scholar] 
ferziger jh   [Google Scholar] 
reynolds wc   [Google Scholar] 
 

Abstract

We use a calculation of periodic homogeneous isotropic turbulence to simulate the experimental decay of grid turbulence. The calculation is found to match the experiment in a number of important aspects and the computed flow field is then treated as a realization of a physical turbulent flow. From this flow, we compute the large eddy field and the various averages of the subgrid-scale turbulence that occur in the large eddy simulation equations. These quantities are compared with the predictions of the models that are usually applied in large eddy simulation. The results show that the terms which involve the large-scale field are accurately modelled but the subgridscale Reynolds stresses are only moderately well modelled. It is also possible to use the method to predict the constants of the models without reference to experiment. Attempts to find improved models have not met with success.

(Published Online April 19 2006)
(Received March 14 1978)
(Revised June 19 1978)



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