Coarse grid selection method based on BDDC region decomposition parallel algorithm

The invention discloses a coarse mesh selection method based on a BDDC region decomposition parallel algorithm, and belongs to the field of large-scale flexible multi-body system parallel simulation prediction. According to the method, the Deluxe scaling matrix is used for constructing the generalized characteristic equation coefficient matrix, and the situation that the coefficient of a sub-domain interface material jumps in the flexible multi-body system can be effectively solved; besides, by calculating a secondary Sul complement matrix of a common edge and condensing information of the rest of the interface except the common edge in the flexible multi-body system subdomain, the stability of the BDDC region decomposition parallel algorithm is ensured effectively aiming at the situation that the subdomain interface material coefficient of the flexible multi-body system jumps, and the method is suitable for large-scale popularization and application of the flexible multi-body system. And the parallel simulat