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

A proposed near-wall (t(2)) over bar-epsilon (t) two-equation model for tur bulent heat transport reproduces the correct near-wall behavior of temperat ure under various wall thermal boundary conditions. In this model, a mixing timescale is introduced to model the production term of epsilon (t) equati on, and a more convenient boundary condition for epsilon (t) under the unif orm wall heat flux is suggested. The present model is tasted through applic ation to turbulent heat transfer for channel flow. Predicted results are co mpared with direct numerical simulation (DNS) data. The near-wall (t(2)) ov er bar-epsilon (t) two-equation model predicts reasonably well the distribu tions of the time-mean temperature. normal turbulent heat flux, temperature variance, dissipation rate and their near-wall budgets. (C) 2001 Elsevier Science Ltd. All rights reserved.