Abstract
The objective of the study is to examine numerically the relation between the flow structure and the dynamical characteristics for the laminar flow in a two-dimensional rough channel. As a rough channel, the two-dimensional channel with repeated square ribs is considered. The Navier-Stokes equation and the equation of continuity have been solved numerically by the finite difference method. The calculation was performed for the range of pitch ratio 1.8≤W/h≤11, and for the range of Reynolds number 5≤Re≤3 000. The results showed that both the shear stress and the pressure acting on the roughness elements changed with the variation of flow pattern over the roughness elements depending on the pitch ratio W/h and Reynolds number Re. The contours of the ratio of pressure drag to total drag acting on the rough wall was shown in the manner of the division chart in W/h Re plane.
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