Visualization and numerical simulation of three dimensional flow over a vertical pillar

Flow past cylinder is a primary example used in fluid mechanics. Even despite the multitude of studies of this case
the mechanism of boundary layer eruption behind a pillar is far from complete. Experimental and numerical investigation
related to the flow past a vertical pillar in channel with free surface was presented in the paper. Hydrodynamic tunnel and
investigation procedure was described. Qualitative research was performed with the use of visualization dye injection for
four values of the Reynolds numbers. Different boundary layer eruption patterns behind the pillar were observed. For deeper
analysis numerical simulation for the same Reynolds numbers using OpenFOAM software was performed. An attempt to
explain flowpath images obtained in experimental research was made. Three-dimensional nature of vortices formed in the
wake of pillar was shown with use of streamlines. It was pointed out that complication of the flow behind the pillar results
from no-slip critical points on the bottom wall behind the obstacle.