Simulation of moving/stationary blade interaction for unsteady flow using sliding interface technique

A sliding interface technique is applied in conjunction with non-orthogonal grids and nonstaggered arrangement techniques to solve the unsteady flow of moving/stationary blade interaction problem. This approach can overcome the shortcoming of the mixing plane methods for computing the inherent periodic unsteadiness caused by the relative motion between moving/stationary blade rows. The pressure implicit split-operator (PISO) method is used to resolve the coupling between velocity and pressure. Calculations are thus made for an incompressible Coutte flow and an unsteady flow of infinite moving/stationary blade rows. The results show that the developed sliding interface method could predict the unsteadiness behavior of rotor/stator interaction in turbomachinery.