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Record Details

Record 43 of 25993
A simplified Reynolds stress model for unsteady turbulent boundary layers
Author and Affiliation:
Fan, Sixin(NASA Lewis Research Center, Cleveland, OH, United States)
Lakshminarayana, Budugur(Pennsylvania State Univ., University Park, United States)
Abstract: A simplified Reynolds stress model has been developed for the prediction of unsteady turbulent boundary layers. By assuming that the net transport of Reynolds stresses is locally proportional to the net transport of the turbulent kinetic energy, the time dependent full Reynolds stress model is reduced to a set of ordinary differential equations. These equations contain only time derivatives and can be readily integrated in a time dependent boundary layer or Navier-Stokes code. The turbulent kinetic energy and dissipation rate needed for the model are obtained by solving the k-epsilon equations. This simplified Reynolds stress turbulence model (SRSM) does not use the eddy viscosity assumption, which may not be valid for unsteady turbulent flows. The anisotropy of both the steady and the unsteady turbulent normal stresses can be captured by the SRSM model. Through proper damping of the shear stresses, the present model can be used in the near wall region of turbulent boundary layers. This model has been validated against data for steady and unsteady turbulent boundary layers, including periodic turbulent boundary layers subjected to a mean adverse pressure gradient. For the cases tested, the predicted unsteady velocity and turbulent stress components agree well with the experimental data. Comparison between the predictions from the SRSM model and a k-epsilon model is also presented.
Publication Date: Jan 01, 1993
Document ID:
19930038625
(Acquired Dec 28, 1995)
Accession Number: 93A22622
Subject Category: FLUID MECHANICS AND HEAT TRANSFER
Report/Patent Number: AIAA PAPER 93-0204
Document Type: Preprint
Publication Information: 13 p.
Publisher Information: United States
Meeting Information: AIAA, Aerospace Sciences Meeting and Exhibit; 31st; Jan. 11-14, 1993; Reno, NV; United States
Meeting Sponsor: AIAA
Contract/Grant/Task Num: NAG3-1168
Financial Sponsor: NASA; United States
Organization Source: NASA Lewis Research Center; Cleveland, OH, United States
Description: 13p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: K-EPSILON TURBULENCE MODEL; NAVIER-STOKES EQUATION; REYNOLDS STRESS; TURBULENT BOUNDARY LAYER; UNSTEADY FLOW; SHEAR STRESS; TURBULENT FLOW
Imprint And Other Notes: AIAA, Aerospace Sciences Meeting and Exhibit, 31st, Reno, NV, Jan. 11-14, 1993
Availability Source: Other Sources
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