关键词: 管道流;紊流;流场;计算

Abstract: The model coefficients in a new nonlinear k-ε turbulence model have been revised.With this new model and the new coefficients, the Reynolds stresses in channel flow, square duct flow and flow with constant rate of strain are calculated. They are consistent well with the experimental data. Numerical solution of turbulent flow passing a backward-facing step with this model has been obtained,Comparison are made between the results predicted by this new nonlinear model and those obtained from the linear k-ε model as well as the experimental data.The result shows that this model have a great improvement upon the linear k-ε model.It also has advantages over other nonlinear k-ε models.

Key words: Channel flow;Turbulent flow;Flow field;Computation