Abstract:

The application of an implicit dual time step algorithm for the prediction of 3 D unsteady flow is presented. It is proved that the dual time step algorithm is efficient in the simulation of unsteady flow with the prediction of vortex shedding over circular cylinders and shock buffeting over bicircular airfoils. The dual time step procedure is used to simulate the unsteady flow through a one stage compressor, and the result reveals that there are complex unsteady flow structures in the blade passage.

Key words: implicit dual time step approach, unsteady flow, numerical simulation, rotor/stator interaction