Abstract
A direct numerical simulation (DNS) of turbulent flow in a channel with longitudinally ridged walls has been carried out using the finite-difference method based on a body-fitted coordinate system. The finite-difference scheme used is consistent with the analytical differential operations. The computational domain is relatively small and similar to the “minimal flow unit”. The simulated ridged wall is the longitudinal ridge and trough of a river bedform. Turbulent flow field with secondary flows is reproduced on the computer by DNS and turbulence statistics such as the mean velocity, the Reynolds shear stress and the mean streamwise vorticity are in good agreement with experimental measurements.
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