We compare and discuss measurements and simulations of the flow inside a scour hole around a cylinder mounted vertically in a flume with a sandy bed. The measurements have been performed by stereoscopic particle image velocimetry. For the simulation we have done a highly-resolved large–eddy simulation. This contribution aims to clarify how reliable the simulated results are and which resolutions are needed for a qualitative and quantitative prediction of flow quantities. We demonstrate that for the investigated Reynolds numbers (22, 618 and 45, 958) nearly converged solutions are obtained; however at large computational efforts. There is a highly satisfying agreement between simulated and measured flow quantities and the large–eddy simulation has an advantage when flow details, for example near the wall, are sought.     «

We compare and discuss measurements and simulations of the flow inside a scour hole around a cylinder mounted vertically in a flume with a sandy bed. The measurements have been performed by stereoscopic particle image velocimetry. For the simulation we have done a highly-resolved large–eddy simulation. This contribution aims to clarify how reliable the simulated results are and which resolutions are needed for a qualitative and quantitative prediction of flow quantities. We demonstrate that for...     »