An anisotropic two-equation heat transfer model for turbulent heat transport under arbitrary wall thermal conditions

摘要

An anisotropic near-wad (t(2)) over bar - epsilon (t) two-equation heat transfer model is presented The turbulent heat flux is expressed in the form of anisotropic eddy diffusivity representation, in which the temperature variance (t(2)) over bar and its dissipation rare epsilon (t), together with k and epsilon, were used to model the isotropic and anisotropic eddy diffusivity for Beat. The method to determine the mixing time scale characterizing turbulent heat transport in the anisotropic turbulent heat flux representation mid the requirement that it should meet nr e presented. The proposed model reproduces the correct wall-limiting Behavior of temperature under arbitrary wall thermal conditions and is applied to turbulent channel flow and heat transfer. Calculated results a, e compared with the direct numerical simulation (DNS) data. It is shown the present model works much better. [References: 18]