Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
668494 | International Journal of Thermal Sciences | 2013 | 15 Pages |
Abstract
Direct numerical simulations of a turbulent channel flow submitted to a high temperature gradient are performed. The temperatures of the channel walls are imposed to 293Â K for the cold one and 586Â K for the hot one. In this configuration, the flow is subsonic, while temperature variations can be strong and induce significant variations of the fluid properties. The unsteady low Mach number Navier-Stokes equations are solved numerically at a Reynolds number of 6400, based on mean centreline velocity, mean centreline viscosity and channel half-width. The mesh that contains about 470Â millions of grid points allows to resolve all essential turbulence scales and no subgrid model is used. The independence of the mesh resolution is shown. A large number of turbulence statistics are computed. The profiles obtained at the cold and at the hot walls are compared using different non-dimensionalizations. The coupling between the turbulence and the temperature gradient is shown to modify the mean and the fluctuation profiles.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Adrien Toutant, Francoise Bataille,