MPI by definition runs muitiple copies of the specified process, with appropriate communication between them. Whether those processes run on the same machine/node or not depends how the hostfile is specified, e.g. see the questions on hosts here: https://www.open-mpi.org/faq/?category=running
Also, doing a google search for "mpp bind to core" should take you to a page how to make sure LS-DYNA jobs don't migrate from core to core during a run
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