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contributor authorSharath S. Girimaji
contributor authorEunhwan Jeong
contributor authorRavi Srinivasan
date accessioned2017-05-09T00:18:39Z
date available2017-05-09T00:18:39Z
date copyrightMay, 2006
date issued2006
identifier issn0021-8936
identifier otherJAMCAV-26599#422_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/133049
description abstractHybrid/bridging models that combine the advantages of Reynolds averaged Navier Stokes (RANS) method and large-eddy simulations are being increasingly used for simulating turbulent flows with large-scale unsteadiness. The objective is to obtain accurate estimates of important large-scale fluctuations at a reasonable cost. In order to be effective, these bridging methods must posses the correct “energetics”: that is, the right balance between production (P) and dissipation (ε). If the model production-to-dissipation ratio (P∕ε) is inconsistent with turbulence physics at that cutoff, the computations will be unsuccessful. In this paper, we perform fixed-point analyses of two bridging models—partially-averaged Navier Stokes (PANS) and unsteady RANS (URANS)—to examine the behavior of production-to-dissipation ratio. It is shown that the URANS-(P∕ε) ratio is too high rendering it incapable of resolving much of the fluctuations. On the other hand, the PANS-(P∕ε) ratio allows the model to vary smoothly from RANS to DNS depending upon the values of its resolution control parameters.
publisherThe American Society of Mechanical Engineers (ASME)
titlePartially Averaged Navier-Stokes Method for Turbulence: Fixed Point Analysis and Comparison With Unsteady Partially Averaged Navier-Stokes
typeJournal Paper
journal volume73
journal issue3
journal titleJournal of Applied Mechanics
identifier doi10.1115/1.2173677
journal fristpage422
journal lastpage429
identifier eissn1528-9036
keywordsFlow (Dynamics)
keywordsTurbulence
keywordsKinetic energy
keywordsEnergy dissipation
keywordsComputation
keywordsEquations
keywordsReynolds-averaged Navier–Stokes equations
keywordsEddies (Fluid dynamics)
keywordsMotion
keywordsFluctuations (Physics) AND Resolution (Optics)
treeJournal of Applied Mechanics:;2006:;volume( 073 ):;issue: 003
contenttypeFulltext


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