MIXED TIME INTEGRATION PARALLEL ALGORITHM AND ITS APPLICATION TO DYNAMIC IMPACT PROBLEM

In order to enhance the efficiency and speed of finite element analysis, the algorithm of mixed time step in an explicit finite element parallel program is proposed for dynamical impact problems. In this paper, mixed time integration parallel program is executed on distributed memory MIMD computer. Based on domain decomposition method, the structure is decomposed into some subdomains according to the time step of element. When problems contain elements with varying sizes and material properties, subcycling method is used to make subdomains with different time step. Subdomains are distributed to processors of cluster in terms of the principle that the quantity of computation on every processor is most uniform. The program applies the usual message-passing parallelization technique based on the message-passing library PVM(parallel virtual machine)to message the information. Finally, numerical examples show that the mixed integration parallel algorithm can markedly improve the calculative efficiency, the speed-up with subcycling and reduce the computation time.