NUMERICAL-SIMULATION OF FLOW AROUND RECTANGULAR PRISM

Using the large eddy simulation (LES), both two-dimensional (2D) and t hree-dimensional (3D) simulations of the velocity and pressure fields surrounding a rigid rectangular prism at a Reynolds number of 10(5) ar e conducted. A finite difference numerical scheme based on a staggered grid is employed. The convection terms are discretized with either QU ICK or central difference schemes, while the Leith method is employed for temporal marching. The computed mean velocity along the symmetry l ine is compared with experimental results as well as numerical results reported by other investigators. It is in closer agreement with the e xperimental results than other reported numerical results. The mean, t he root mean square (RMS) pressure distribution on the prism surface, and the integral forces (lift and drag) are computed. The correlation coefficients of pressure at different chordwise locations around a squ are prism are also calculated. These simulations are found to be in ve ry good agreement with available experimental results reported in the literature. Both QUICK and central difference schemes are used to disc retize the convection terms, and the upwinding effect of the QUICK sch eme is investigated. A grid refinement study is also conducted to eval uate the effects of grid size on the simulation results.