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Category 17: Acoustic Equations
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These boundary conditions are applied to acoustic equations (Preal, Pimag, Reyn_stress).

.. include:: /problem_description_file/boundary_conditions/acoustic/apr.rst

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.. include:: /problem_description_file/boundary_conditions/acoustic/apr_plane_tran.rst

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.. include:: /problem_description_file/boundary_conditions/acoustic/api.rst

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.. include:: /problem_description_file/boundary_conditions/acoustic/api_plane_tran.rst