| Flow over flat wall is simulated by mean of large eddy simulation on the parallel computation platform in this paper.The parallel computation platform is made up of PC connected networks under the circumstance of WINDOWS NT using the star-typed topological structure with the support of universal MPI (Massage Passing Interface). Its performance was tested after the installment finished, and it was proved that calculating efficiency was all improved to some degree when dealing with the problems of different complexity.Turbulence over flat wall is presented with the CFD software CFD ACE(U) when given by various inlet boundary conditions, subgrid model and turbulence intensity under the two-dimensional circumstance. On comparing these outcomes with the experimental data, we can analyze the impacts that all these factors have on the development of flow boundary layer.Three-dimensional flow over flat wall is simulated by virtue of large eddy simulation. The subgrid model is Germano dynamical model and the numerical difference scheme is center difference scheme of two-order precision. The outcomes can be validated by its experimental counterpart. The results show the moment developing course of flow over flat wall and the evolvement of coherent structure, and also completely simulate all kinds of detail processes in development of boundary layer over flat wall, such as the generation and rise of low-speed stream, the extension and rupture of horse-hoof-shaped vortex and so on. Additionally there is particular analysis on the generation of vortex along span.
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