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The use of DDM in FEA makes parallel solution of the whole analysis e.g. assembly, solver etc possible. DDM splits the model in domains and runs them in parallel. Since there are interconnected nodes between domains, Will DDM give unreliable result? Also, is there any other factor that can affect the correct solution result?
The application is in structural dynamics FEA and the platform is SMP (single machine with 2 processing cores).
Domain decomposition methods do not discard coupling, they just isolate it to enable parallel computation. For explicit dynamic simulations, this just amounts to exchanging ghost values, and the (distributed) solution is identical to a serial implementation. For implicit problems, DD is an iterative method and the convergence rate will depend on the decomposition (number and shapes of subdomains) for any particular method. Methods in which the rate is robust to the number of subdomains must have more than one level (they need a "coarse grid" to produce global communication on each iteration). Continuity between subdomains will be enforced either by definition of the state space (a non-overlapping vertex partition) or by Lagrange multipliers (the FETI family).
