Abstract
Three dimensional simulations of flow around an elongated rectangular cylinder with a section of depth / breadth of 5.0 are carried out by means of direct finite difference technique without any turbulence model. As the span leneth of the cylinder and the grid space in the spanwize direction are varied, the unsteady 3-D flow structures and the pressure distributions acting on the side surface of the cylinder are investigated. On condition that instantaneous 3'D flow structures inside the shear layer separated from the leading edge are recognized, the pressure distributions of the simulations are in good agreement with the those of the previous experiment. We indicate the requirements of the discretized resolutions and the spanwize length of the computational region for the appropriate simulation of the 3-D flow structures.
