A parallel moving grid multigrid method for flow simulation in rotor-stator configurations

A parallel multigrid Þnite volume solver for the prediction of unsteady ßows in rotorÐstator conÞgurations using a moving-grid technique is presented. The numerical solution procedure is based on a second-order Þnite volume discretization with collocated block-structured grids, an implicit time discretization, a pressure- correction procedure of SIMPLE type, a non-linear multigrid method and a grid partitioning technique for parallelization. For the handling of the rotation and the relative movement of stationary and moving parts of the conÞguration a splitting technique is employed, which, based on the block structuring, divides the computational domain in a stationary and a rotating part. According to this splitting, the time-dependent ßow equations are solved in a stationary and rotating frame of reference, and a special coupling procedure is used for the interfacial blocks. The method is investigated with respect to its accuracy, where special emphasis is given to the inßuence of di¤erent interpolation techniques of pressure-related terms within the non-staggered pressure-correction scheme. As a practical application, the ßow in a stirrer conÞguration with ba§es is studied, for which also results concerning the numerical and parallel e¦ciency of the proposed method are given