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contributor authorD. Keith Walters
contributor authorDavor Cokljat
date accessioned2017-05-09T00:28:16Z
date available2017-05-09T00:28:16Z
date copyrightDecember, 2008
date issued2008
identifier issn0098-2202
identifier otherJFEGA4-27349#121401_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/138128
description abstractAn eddy-viscosity turbulence model employing three additional transport equations is presented and applied to a number of transitional flow test cases. The model is based on the k-ω framework and represents a substantial refinement to a transition-sensitive model that has been previously documented in the open literature. The third transport equation is included to predict the magnitude of low-frequency velocity fluctuations in the pretransitional boundary layer that have been identified as the precursors to transition. The closure of model terms is based on a phenomenological (i.e., physics-based) rather than a purely empirical approach and the rationale for the forms of these terms is discussed. The model has been implemented into a commercial computational fluid dynamics code and applied to a number of relevant test cases, including flat plate boundary layers with and without applied pressure gradients, as well as a variety of airfoil test cases with different geometries, Reynolds numbers, freestream turbulence conditions, and angles of attack. The test cases demonstrate the ability of the model to successfully reproduce transitional flow behavior with a reasonable degree of accuracy, particularly in comparison with commonly used models that exhibit no capability of predicting laminar-to-turbulent boundary layer development. While it is impossible to resolve all of the complex features of transitional and turbulent flows with a relatively simple Reynolds-averaged modeling approach, the results shown here demonstrate that the new model can provide a useful and practical tool for engineers addressing the simulation and prediction of transitional flow behavior in fluid systems.
publisherThe American Society of Mechanical Engineers (ASME)
titleA Three-Equation Eddy-Viscosity Model for Reynolds-Averaged Navier–Stokes Simulations of Transitional Flow
typeJournal Paper
journal volume130
journal issue12
journal titleJournal of Fluids Engineering
identifier doi10.1115/1.2979230
journal fristpage121401
identifier eissn1528-901X
keywordsFlow (Dynamics)
keywordsTurbulence
keywordsEddies (Fluid dynamics)
keywordsViscosity
keywordsBoundary layers
keywordsEquations
keywordsAirfoils
keywordsFlat plates AND Engineering simulation
treeJournal of Fluids Engineering:;2008:;volume( 130 ):;issue: 012
contenttypeFulltext


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