Abstract
The unsteady flow structures around a square cylinder are examined numerically. The non-linear k-ε model with the effect of the strain parameter and the rotation parameter is adopted as the turbulence model. Applicability of the model to the Karman vortex shedding in the 2-D flow field is firstly investigated through the comparison of the calculated results with the experimental ones conducted in closed water section by Lyn (1992) and the model constants are adjusted. Then, the 3-D computations of unsteady flows in open channels are carried out focusing on the Karman vortex and the horseshoe vortex.
