A new finite element method for unsteady analysis of fluid dynamics

摘要

Based on compressible flow formulation, large eddy simulation, explicit time integration scheme and sliding mesh techniques, a general but efficient finite element method for the unsteady analysis of the stator-rotor or impeller-volute interaction of rotating fluid machinery is presented. By this method, not only the performance and efficiency of the fluid machinery but also the flow induced vibration and noise can be computed. In this paper, numerical examples with verification on the flow past acircular cylinder and in a centrifugal blower are carried out to evaluate the accuracy and versatility of the finite element method. By directly integrated in the solver, the particle flow traces are derived and animated to give better understanding onthe complex 3D unsteady flow fields.