Parallel computations of turbulent incompressible jets

摘要

Numerical computations of an incompressible turbulent round jet are performed on multiple processors in parallel. Computations are performed on the IBM SP2 and a quad-pentium PC workstation running Windows NT operating system. a finite volume numerical method is employed and a Line Gauss-Siedel iterative scheme is employed to solve the Poisson-type pressure equation. Message passing between processors is achieved through the MPI communication library. The results are first compared with theoretical and experimental results and reasonable agreement is obtained. The performance on multiple processors is evaluated on the basis of speed-up, efficiency and effectiveness. Two grid resolutions are employed to study the effect of the size of the computation on the parallel performance. The quad-pentium was found to be faster than the SP2 because of its greater clock-speed. But the speed-up and efficiency of the SP2 was found to be superior compared to that of the quad-pentium. The results suggest that there is scope for considerable reduction in the time of multi-dimensional jet computations using parallel processing.