Abstract
Separated flows around several bluff bodies and wings have been studied. First, aerodynamic characteristics of rectangular Cylinders, trapezoidal cylinders, a row of flat plates, and concave bodies are measured and the flow fields are visualized by the smoke-wire technique. The results show that drag coefficients of rectangular and trapezoidal cylinders change remarkably with their shape parameters and that flow patterns of them are deeply concerned with their aerodynamic characteristics. Then, the potential flow analysis with linear-vortex and constant-source distribution is used for the calculation of separated flow around wings and a finite-difference method for the stream function-vorticity formulation of Navier-Stokes equation is used for two normal flat plates arranged side by side to a uniform flow. The results show good agreement with experiments. Also the discrete vortex method combined with singularity method is used for bluff bodies with some improvements, which are made on the expression of separated shear layer and on the estimation of vorticity of shedding vortices. The separated flows around rectangular cylinders and trapezoidal cylinders are simulated numerically. The numerical results show good agreement with experiments.
