Numerical Simulation of Incompressible Flow on Parallel Computer with the Domain Decomposition Technique.

Abstract

The domain decomposition technique, which is widely used in the solution of a flow field on multiprocessors, requires a treatment of new boundaries appearing between subdomains. Poor convergence tends to be introduced due to these new boundaries where otherwise very frequent communication between neighboring processors is required. We determined how frequently processors should communicate with each other so as to obtain the best efficiency. In this study, steady 2-D incompressible laminar and turbulent flows are solved on the transputer system equipped with distributed-type memory. The SIMPLE method is employed as a numerical algorithm for the incompressible flow solution. The performance of parallel programs, such as the efficiency and increase in speed, is discussed for the cavity and sudden expansion flows.