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An analysis of RNG based turbulence models for homogeneous shear flowIn a recent paper, the authors compared the performance of a variety of turbulence models including the k-epsilon model and the second-order closure model based on Renormalization Group (RNG) Methods. The performance of these RNG models in homogeneous turbulent shear flow was found to be quite poor, apparently due to the value of the constant C(sub epsilon1) in the modeled dissipation rate equation which was substantially lower than its traditional value. However, recently a correction has been made in the RNG based calculation of C(sub epsilon1). It is shown that with the new value of C(sub epsilon1), the performance of the RNG k-epsilon model is substantially improved. On the other hand, while the predictions of the revised RNG second-order closure model are better, some lingering problems still remain which can be easily remedied by the addition of higher order terms.
Document ID
19910014120
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Speziale, Charles G. (NASA Langley Research Center Hampton, VA., United States)
Gatski, Thomas B. (NASA Langley Research Center Hampton, VA., United States)
Fitzmaurice, Nessan (Case Western Reserve Univ. Cleveland, OH., United States)
Date Acquired
September 6, 2013
Publication Date
April 1, 1991
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AD-A236667
NASA-CR-187552
ICASE-91-37
NAS 1.26:187552
Accession Number
91N23433
Funding Number(s)
CONTRACT_GRANT: NAS1-18605
PROJECT: RTOP 505-90-52-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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