Volume 10, Issue 2 (9-2010)
Modares Mechanical Engineering 2010, 10(2): 80-87 |
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Heidarinejad G, Eskandari Sani A, Zolfaghari A. On the two-dimensional turbulent flow and transport phenomena Using Large Eddy Simulation method. Modares Mechanical Engineering 2010; 10 (2) :80-87
URL: http://mme.modares.ac.ir/article-15-4738-en.html
URL: http://mme.modares.ac.ir/article-15-4738-en.html
1- Tarbiat Modares University
Abstract: (21568 Views)
A passive scalar is a property that is affected by the flow field without affecting it. In this paper, first, the governing equations on the turbulent flows are solved and the property of a passive scalar in two dimensions is numerically studied. Having the values of the velocity components, the governing equation on transport of a passive scalar is solved. To compute the turbulent velocity field, the Large Eddy Simulation (LES) method using Smagorinsky subgrid scale is invoked. The flow in a cavity has been the basis to validate the accuracy of the generated computer code. To ensure the compatibility between the flow and the transport of passive scalar fields a similar LES approach is used. As a three-dimensional numerical solution for a turbulent flow fields needs a massive computational time and efforts, therefore a two-dimensional simulation used for a proper saving. Instead, to validate the numerical results, the range of the Reynolds number of the flow is kept within the range of the two-dimensional measurements. Comparison of the numerical results and the experimental measurements in two-dimension reveals the high accuracy of the results and compatibility between the flow and passive scalar fields. Ability of developed scheme to accurately handle transport of a passive scalar is promising to extend LES method into the transport of more species and hence to simulate reacting flows.
Keywords: Key words: Passive Scalar, turbulence, Large Eddies, Filtering, Numerical simulation, Turbulent Flow Modeling, Cavity Flow, Backward Facing step Flow
Received: 2007/07/29 | Accepted: 2009/06/19 | Published: 2010/09/7
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