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Calculations of turbulent separated flowsA numerical study of incompressible turbulent separated flows is carried out by using two-equation turbulence models of the K-epsilon type. On the basis of realizability analysis, a new formulation of the eddy-viscosity is proposed which ensures the positiveness of turbulent normal stresses - a realizability condition that most existing two-equation turbulence models are unable to satisfy. The present model is applied to calculate two backward-facing step flows. Calculations with the standard K-epsilon model and a recently developed RNG-based K-epsilon model are also made for comparison. The calculations are performed with a finite-volume method. A second-order accurate differencing scheme and sufficiently fine grids are used to ensure the numerical accuracy of solutions. The calculated results are compared with the experimental data for both mean and turbulent quantities. The comparison shows that the present model performs quite well for separated flows.
Document ID
19930017972
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Zhu, J.
(NASA Lewis Research Center Cleveland, OH, United States)
Shih, T. H.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1993
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
ICOMP-93-13
CMOTT-93-5
NASA-TM-106154
NAS 1.15:106154
E-7838
Meeting Information
Meeting: United States National Congress on Computational Mechanics
Location: Washington, DC
Country: United States
Start Date: August 16, 1993
End Date: August 18, 1993
Sponsors: The United States Association for Computational Mechanics
Accession Number
93N27161
Funding Number(s)
PROJECT: RTOP 505-90-5K
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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