Prediction of turbulent flow in two-dimensional channel with turbulence promoters. II - Numerical prediction by k-epsilon model and comparison with experimental results

Fully developed incompressible turbulent flow in a two-dimensional channel with turbulence promoters has been simulated numerically. A K-epsilon model, which consists of two model transport equations of turbulence energy and energy dissipation rate besides the mean velocity equation, is applied. The Reynolds number is set at 11,000 and only 400 grid points are distributed. A detailed comparison between the calculated results by k-epsilon model and large eddy simulation is made. The distributions of mean velocities, turbulence energies and turbulence shear stresses by both methods are in good agreement near the upper wall without turbulence promoter, but quite different behind the turbulence promoters. The calculated results are also compared with the experimental results. The large eddy simulation method can describe these flow fields well. Calculations were carried out on the HITAC M 200/280H system computer of University of Tokyo.