Numerical Computations Of Unsteady Flows For Multistage Cascades Using Distributed Computing Technology

Under the condition of the improved computer resource and calculating method, CFD (Computational Fluid Dynamics) has played a more important role in both theoretically analyzing the principle of the internal flow and optimizing the performance of the apparatus in turbomachinery. This thesis makes a progress in using the distributed network parallel computing technology in the CFD field based on the previous works, followed development of parallel computing environment and applications.In order to improve the simulating accuracy of the complicated flow field, one of the most effective methods is parallel computing technology, under the condition of lack of computing resource of single computer. This thesis is focused on the popular distributed network parallel computing technology, and accomplished the numerically predicting the rotor/stator interactions using two dimensional Navier-Stokes Equations on the PVM network parallel platform. For improving the accuracy to capture the shock wave, the TVD scheme presented by H.C.Yee and A.Harten is used. Approximate Factorization presented by R.M.Beam and R.F.Warming is used to make the algorithm efficient. The algebraic Baldwin-Lomax model is used to evaluate the turbulence effects. In order to resolve the key problems of distributed network parallel technology in CFD applications, A Universal Interface Model on Parallel Platform was established. With this universal interface model, modification of traditional CFD program to parallel CFD program is simplified, CFD core program can be modified to parallel program using in different cases easily and quickly; the transplantability of CFD parallel program in different platforms is improved.The computed results demonstrate that the PVM network parallel platform developed is stable and robust, and the Universal Interface Model on Parallel Platform is useful.