Slip Factor and Slip Velocity on a Permeable Bed

Abstract

Abstract CHEN, Y.-Y.; CHEN, G.-Y., and LIN, C.-H. 2012. The slip factor and slip velocity on a permeable bed. In the present study, a new, simple method for determining the slip velocity (also called the bed velocity) at the solid-fluid interface in the wave boundary layer is proposed. Based on experimental and numerical results, when waves travel over a rigid permeable seabed, a nonzero slip velocity exists at the interface. The defect of a small slip velocity has been found to occur in previous studies and is usually encountered in fluid–porous layer problems. In the wave–rigid permeable seabed problem, the slip effect depends on the properties of the seabed. The slip velocity boundary condition (SVBC) is one specification of the slip conditions and is usually applied to explain the slip phenomenon in a fluid–porous layer problem. However, the traditional SVBC or the slip velocity is only considered in a single flow, and application of SVBC in harmonic motion is still an open problem that necessitates a...