Large scale structural acoustics in Sierra-SD

Abstract

In this talk, we will present an overview of structural acoustics and model reduction capabilities in Sierra-SD (Structural-Dynamics). Sierra-SD is a massively parallel finite element application for structural dynamics and acoustics, having recently demonstrated the implicit solution of models with over 2 billion degrees of freedom and running on up to one hundred thousand distributed memory cores. Domain decomposition and MPI parallelism are used to split a large domain into many small domains that can be solved in parallel. Sierra-SD offers a wide range of capabilities for model reduction. For acoustic models, infinite elements and perfectly matched layers are available to reduce domain size. For structural models, Craig-Bampton style superelements are available to reduce specific components in the structural portions of the model. Various coupling and handoff methods between linear structural acoustics codes and nonlinear solid and fluid mechanics codes are used to reduce model size. Large-scale, realistic applications will be presented on models such as ship shock loading and vibration of reentry bodies. [Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy's National Nuclear Security Administration under Contract DE-NA-0003525.]