The Influence of Grooved Surface and Liquid Properties on Vortices Formation in Vicinity of Immersed Cylinders

The paper is dedicated to the experimental and numerical investigations of the viscous and viscoelastic flows around immersed cylinders with smooth and grooved surfaces. The study analyses the influences of the cylinders surface quality on the vortical structures and the wake developed downstream in a 2D open channel. The analyzed flow is in the domain of the free surface weakly turbulence regime under subcritical conditions. Numerical simulations are performed with turbulent solvers implemented in Ansys Fluent, using the VOF code for the calculation of the free surface geometry. The numerical results and visualizations are corroborated to determine the effect of the grooved surface on the drag coefficient and the location of the boundary layer separation points. The investigations emphasize also the qualitative changes of the flow spectrum induced by the Reynolds number magnitude and the presence of elasticity within the viscous fluid.