Parallel Algorithm With The Cluster System For The Numerical Simulation Of Three-dimensional Flow In Turbomachinery

CFD (Computational Fluid Dynamics) for the numerical simulation of real flow in turbomachinery is one of the most powerful methods to research the three-dimensional unsteady turbulent flow and important approach to develop the design technique of turbomachinery. Now, great progression has been made on numerical computing of full-three-dimensional Navior-Stokes equations that has gradually become the main tool of engineering design. Much more grid points are required in order to differentiate the structure of flow field which is extremely complex inside turbomachinery. In addition, unsteady flow simulation needs gain flow movement along time. As a result, the computing task of the numerical simulation is very great. In order to make the long computing can be expediently applied to engineering, the computing time have to be decreased and the efficiency have to be increased. There are two ways that will be effective. One way is improving numerical algorithm by all kinds of skills to accelerate convergence. The other way is introducing parallel computing.The dissertation is focused on the following aspects:1. A system of high resolution numerical simulation on complex flow in turbomachinery has been developed. The application of an unconditional stable implicit algorithm (LU-SGS) extremely improves the convergence rate. As the base of the comparison with parallel computing, an example completed on single processor is given.2. Cluster of workstation (COW) has been established as parallel computing platform.3. A parallel computing program of three-dimension flow numerical calculation has been completed. Some important techniques including communication among nodes and load balancing are analyzed.