TWO AND THREE DIMENSIONAL NUMERICAL FLUID FLOW ANALYSIS FOR AERODYNAMIC CHARACTERISTICS OF RECTANGULAR CYLINDERS WITH SIDE RATIO 4

Abstract

Three-dimensional and two-dimensional simulations of the unsteady flows around a rectangular cylinder are carried out by means of IBTD+FS Finite Element technique without any turbulence model. In case of the three-dimensional simulations, it is confirmed that the aerodynamic characteristics of a rectangular cylinder with a side ratios of breadth/depth(B/D) of 4.0 is good agreement with the experimental result. We have succeeded in simulating the detailed behaviors of the shear layer and the vortex motions around a rectangular cylinder. The relation between the structures and the aerodynamics of the rectangular cylinders is also investigated.