Hydrodynamic modelling of roughness discontinuities

TL;DRAbstract

In this study the effect of a roughness discontinuity caused by a pipeline cover layer in the sea bed is investigated. As a result of this non-uniform flow configuration, the environmental forces acting on the pipeline cover layer change. To investigate the effect of roughness discontinuities, a numerical model of the flow is made; thereby neglecting the effect of waves. This is done by making use of the flow solvers Delft3D-FL0W and CFX. The most important difference between these solvers is the hydrostatic pressure assumption in Delft3D-FL0W, while CFX solves the full 3D Navier Stokes equations. In order to create reliable simulations, both hydrostatic and non-hydrostatic calculations are performed and compared with experiments and calculations found in literature. These calculations deal with the transition from hydraulically smooth to hydraulically rough surfaces and vice versa. The phenomena of overshooting and undershooting of the wall/bed shear stress near the discontinuity and

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