Abstract: Numerical simulations of the flow field around a double-wedge shaped projectile overtaking shocks, which move in two different directions, are carried out by solving unsteady compressible Navier-Stokes equations. In order to have enough grid resolution, the unified zonal fortified solution algorithm is used. Two test cases, the pursuing overtaking and the colliding overtaking are considered and discussed. The complex structure of wave systems and the aerodynamic forces are discussed. By comparing with the results acquired with the original methods, it is shown that the developed unified zonal method can be an effective and simple tool for handling complex bodies and enhancing the accuracy of numerical simulation.

Key words: unified zonal fortified solution algorithm, numerical simulation, pursuing overtaking, colliding overtaking