Reliability of Wall Shear Stress Estimations in Front of a Wall-Mounted Cylinder

We investigate the flow around a circular cylinder mounted on a flat plate which has attracted attention due to a number of effects. Our focus is on modeling erosion rates during scour evolution around a cylindrical bridge pier in a river bed. Current models of sediment erosion rates use the average wall shear stress acting on sediment grains. We aim at understanding how instantaneous shear stress fluctuations affect the erosion rates, how they can be used in erosion rate modeling and how instantaneous and average wall shear stresses scale with Reynolds number. To do so, the wall shear stresses around a wall-mounted cylinder have to be estimated first.