A near-wall two-equation heat transfer model for wall turbulent flows

摘要

A proposed near-wall t~2- ε_t two-equation model for turbulent heat transport reproduces the correct near-wall behavior of temperature under various wall thermal boundary conditions. In this model. a mixing timescale is introduced to model the production term of ε_t equation. and a more convenient boundary condition for ε_t under the uniform wall heat flux is suggested. The present model is tested through application to turbulent heat transfer for channel flow. Predicted results are compared with direct numerical simulation (DNS) data. The near-wall t~2-ε_t two- equation model predicts reasonably well the distributions of the time--mean temperature. normal turbulent heat flux, temperature variance, dissipation rate and their near-wall budgets.