Cylinder-wall junction flow
Underlying Flow Regime 3-35
We applied a Large Eddy Simulation as well as Particle Image Velocity experiments at the flow around a vertical cylinder on a flat rigid bed. The occurring flow structure (horseshoe vortex) reveals a high dynamic pattern with horzintal oscillations generating turbulent kinetic energy. The vortex is linked to the dynamic of a wall-parallel jet, which exters highly amplified shear stress to the bottom plate. Due to this shear stress erosoin can take place in case of sand-embedded bridge piers leading to scour. This study followed a bilateral apporach by studying this flow configuration numerically as well as experimentally. Both data sets refer to the same flow configuration, but were acquired independently and are made accessible at the end of the section Evaluation.
Contributed by: Ulrich Jenssen, Wolfgang Schanderl, Michael Manhart — Technical University Munich
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