Abstract
Turbulent channel flows are simulated numerically with the no-slip condition imposed on walls, by the use of a generalized k-ε model. Anisotropy of turbulent intensities is studied by combining the numerical result with a theoretical expression for turbulent intensities. Moreover, turbulent intensities in asymmetric channel flows between smooth and rough walls are estimated on the basis of a numerical result with the logarithmic-velocity law as a wall condition. The anisotropy thus found, which cannot be calculated by the usual k-ε model, is in fairly good agreement with experimental results.
