The finite element analysis of complex structure often requires a refine mesh in some local domain. To reduce the computation time, an explicit asynchronous step parallel computing method is proposed. The domain decomposition with overlapping node method is used to divide the model into different subdomains. The multiple overlapping nodes between different subdomains constitute the coupling region. Each subdomain selects the time step based on the mesh characteristics. The subcycling method is adopted to tackle the matching of asynchronous step boundary. The subdomain model, boundary information and calculation results are stored in parallel files which mean the overall finite element analysis process is implemented in parallel. The validity and efficiency of the proposed method are verified through three simulation cases which conducted on Tianhe 2 multi-core supercomputers. The results of simulation cases show that the proposed method has a higher accuracy than classic subcycling method under the same time step. The total speedup of the algorithm relates to the step ratios between subdomains, the number of subdomain and the load balance. This approach offers an efficient way to solve large-scale and super-scale structural dynamics analysis with local refine mesh.

中文翻译：

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一种用于多核集群有限元分析的显式异步步进并行计算方法

复杂结构的有限元分析通常需要在某些局部域中细化网格。为了减少计算时间，提出了一种显式异步步进并行计算方法。使用重叠节点的域分解方法将模型划分为不同的子域。不同子域之间的多个重叠节点构成耦合区域。每个子域根据网格特征选择时间步长。采用子循环方法解决异步步长边界匹配问题。子域模型、边界信息和计算结果存储在并行文件中，这意味着整个有限元分析过程是并行执行的。通过在天河二号多核超级计算机上进行的三个仿真案例验证了所提方法的有效性和有效性。仿真案例结果表明，在相同的时间步长下，该方法比经典的子循环方法具有更高的精度。算法的总加速与子域之间的步长比、子域数量和负载平衡有关。这种方法提供了一种有效的方法来解决具有局部细化网格的大规模和超大规模结构动力学分析。