Abstract:

The separated flow structures of the transonic flow around a blunt nosed and short body at large angles of attack are calculated by using three different types (inviscid, laminar and turbulent) of numerical simulations. Numerical results are compared with each other. In the numerical calculation van Leers Schemes is used to discretize the inviscid flux terms and a kind of limiter function is constructed to realize TVD character. The viscous flux terms are discretized by using a central difference scheme. B L model is used in the turbulent flow calculation. Numerical results show that the common feature of the 3 different separated flow structures is the unsteady quasi periodic character, while their detailed structures are quite different.

Key words: transonic flow, ablunt nosed and short body, separated flow at alarge angle of attack, unsteadyflow