Abstract: The local refined mesh leads to a large increase of calculation time in the structural dynamic finite element analysis. In order to improve the calculation efficiency, an explicit asynchronous parallel computational method based on multiple overlapping nodes is proposed. The procedure combines domain decomposition with subcycling method. The whole structure is divided into several subdomains by node partition method and the integral step size is selected according to the internal mesh sizes of the subdomain. An explicit Newmark time integral scheme is adopted in the subdomain. Multiple overlapping nodes between different subdomains constitute the coupling region without the interpolation process in the subcycling process. Simulation results of two cases implemented on Tianhe 2 supercomputer platform show that the proposed method can improve the computational efficiency with a high computational accuracy.

Key words: explicit integration; finite element analysis; multiple overlapping nodes; asynchronous parallel; refined mesh