Abstract
This paper presents the results of modeling of fully developed turbulent gas flow in a uniform heated vertical tube by using the LES method and Smagorinski model. Unstructured Cartesian grids with local anisotropic refinement were used for modeling hydrodynamics and heat transfer in cylindrical pipes. Such meshes unlike structured meshes in cylindrical coordinates allow to construct more detailed meshes for the LES method. In addition, such meshes allow to simulate flows in channels of arbitrary cross-section. To verify the proposed methodology the results of direct numerical simulation of turbulent air flow in a vertical heated tube for forced and mixed convection were used. Thus, for upward flows the most interesting case with significant laminarization flow due to the buoyancy influence was studied.
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