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Can large eddy simulation (LES) predict laminar to turbulent flow transition?

S. Aly, Hossam and M. Saqr, Khalid and A. Eldrainy, Yehia and Jaafar, Mohammad Nazri (2009) Can large eddy simulation (LES) predict laminar to turbulent flow transition? International Journal of Mechanical and Materials Engineering, 4 (1). pp. 42-48. ISSN 1823-0334

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Abstract

Four numerical experiments have been conducted using Large Eddy Simulation (LES) to visualize laminar and turbulent incompressible flows over a horizontal finite cylinder. The unsteady velocity fluctuations were studied at a point on the near wake downstream the cylinder. These fluctuations were used, through the fundamental understanding of LES mechanism, as indications of the LES sensitivity in capturing the occurrence of transitional flow. Such proved sensitivity is deemed to depend on the Reynolds number and problem physics. The purpose of this study is to investigate the capability of LES in capturing laminar-to-turbulent transitional flow dynamics. Moreover, the present article describes a generalized methodology to use LES in predicting the spatial and temporal onsets of transitional flow. The significance of this study is pointed out from the fundamental dilemma of predicting transitional flow, and the wide application domain of such phenomena.

Item Type:Article
Uncontrolled Keywords:LES, CFD, transitional flow, turbulence model, laminar to turbulent transition
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Mechanical Engineering
ID Code:13245
Deposited By: Ms Zalinda Shuratman
Deposited On:27 Jul 2011 01:16
Last Modified:27 Jul 2011 01:16

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