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Testing of RANS Turbulence Models for Stratified Flows Based on DNS DataIn most geophysical flows, turbulence occurs at the smallest scales and one of the two most important additional physical phenomena to account for is strati cation (the other being rotation). In this paper, the main objective is to investigate proposed changes to RANS turbulence models which include the effects of stratifi- cation more explicitly. These proposed changes were developed using a DNS database on strati ed and sheared homogenous turbulence developed by Shih et al. (2000) and are described more fully in Ferziger et al. (2003). The data generated by Shih, et al. (2000) (hereinafter referred to as SKFR) are used to study the parameters in the k- model as a function of the turbulent Froude number, Frk. A modified version of the standard k- model based on the local turbulent Froude number is proposed. The proposed model is applied to a stratified open channel flow, a test case that differs significantly from the flows from which the modified parameters were derived. The turbulence modeling and results are discussed in the next two sections followed by suggestions for future work.
Document ID
20040031727
Document Type
Other
Authors
Venayagamoorthy, S. K. (Stanford Univ. Stanford, CA, United States)
Koseff, J. R. (Stanford Univ. Stanford, CA, United States)
Ferziger, J. H. (Stanford Univ. Stanford, CA, United States)
Shih, L. H. (Stanford Univ. Stanford, CA, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2003
Publication Information
Publication: Center for Turbulence Research Annual Research Briefs 2003
Subject Category
Numerical Analysis
Funding Number(s)
CONTRACT_GRANT: NCC2-1371
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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