Abstract: In accordance with the recent experimental research for flow visualization, the unsteady behavior of the starting period is investigated numerically for flow past blunt bodies. Finite difference methods are employed to solve the unsteady two-dimensional incompressible Navier-Stokes equations. A short discussion is presented of explicit, implicit and ADI methods. Finally, the explicit and ADI schemes are used to study the flow field in the starting period for flow past mountain-shaped and rectangular bodies.

Key words: blunt body, ADI method, unsteady flow, computational fluid mechanics