TY - JOUR T1 - On the two-dimensional turbulent flow and transport phenomena Using Large Eddy Simulation method TT - ‌بررسی جریان آشفته دوبعدی و پدیده انتقال به‌روش شبیه‌سازی گردابه‌های بزرگ (LES) JF - mdrsjrns JO - mdrsjrns VL - 10 IS - 2 UR - http://mme.modares.ac.ir/article-15-4738-en.html Y1 - 2010 SP - 80 EP - 87 KW - Key words: Passive Scalar KW - turbulence KW - Large Eddies KW - Filtering KW - Numerical simulation KW - Turbulent Flow Modeling KW - Cavity Flow KW - Backward Facing step Flow N2 - 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. M3 ER -