Numerical studies of unsteady flow past bluff bodies

Unsteady flow past prismatic two dimensional bodies have been numerically studied by solving the full Navier-Stokes equations at Reynolds numbers up to 1000 to study onset of vortex shedding and early stages of flow evolution. Loads have been calculated for the trapezoid section by solving Poisson equation for total pressure and its connection to the generation of unsteadiness has been explained. In addition, flows past two dimensional square cylinder with three different front corner fillet sizes have been numerically studied by solving the full Navier-Stokes equations at high Reynolds number of 14,000. Specific attention has been given to flow evolution at early stages in terms of vortex formation and shedding, interaction between vortex and body, and interaction between vortices. Emphasis is paid to the effect of different front corner fillet sizes on the flow patterns. Loads are also studied for the 3 cases at early stages.

Author dc:creator

• SUN RENHAI

• Bluff Bodies, Unsteady Flow, Navier-Stokes Equations, Orthogonal Grid, Upwind Scheme, Votex Shedding