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Evaluation of Full Reynolds Stress Turbulence Models in FUN3D for Axisymmetric Jet FlowTwo full seven-equation turbulence models available in the FUN3D code are evaluated for their ability to improve the computation of challenging mixing flows encountered in aerospace propulsion. These models are the SSG/LRR and Wilcox full second-moment Reynolds stress models. They solve equations for the six components of the Reynolds stress and a seventh equation for the turbulent length scale. Two standard eddy viscosity models are also evaluated for comparison, the Spalart-Allmaras (SA) one-equation model and the Menter Shear Stress Transport (SST-V) two-equation turbulence model. Flow through an axisymmetric reference nozzle is examined at three flow conditions: subsonic unheated, subsonic heated, and near sonic unheated. Centerline profiles of velocity and turbulent kinetic energy and radial profiles of velocity, turbulent kinetic energy and turbulent stresses are examined. Results showed that the SA model did well at predicting the jet potential core length, but over-mixed the downstream flow, whereas the SST-V model over-predicted the potential core length. The Wilcox-model significantly over-predicted the potential core length and under-predicted the mixing and was not well-suited for the jet flows evaluated, however the SSG/LRR Reynolds stress model did well at predicting the mixing rate and mean velocity for all cases examined.
Document ID
20190004932
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Dudek, Julianne C.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
May 2, 2019
Publication Date
April 1, 2019
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
GRC-E-DAA-TN64966
NASA/TM—2019-220067
E-19657
AIAA Paper 2019–2332
Meeting Information
Meeting: 2019 Science and Technology Forum (SciTech)
Location: San Diego, CA
Country: United States
Start Date: January 7, 2019
End Date: January 11, 2019
Sponsors: American Institute of Aeronautics and Astronautics (AIAA)
Funding Number(s)
WBS: 109492.02.01.01.05
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Technical Review
Single Expert
Keywords
mixing layers
turbulent mixing
Reynolds averaging
computational fluid dynamics
jet mixing flow
Reynolds stress
turbulence models
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