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FEM acoustics of a simplified compartment model I

This is an example of a simplified compartment model with hexaeder elements and velocity boundary conditions. It is shown how to set up a model for frequency domain FEM acoustics with *FREQUENCY_DOMAIN_ACOUSTIC_FEM and how to post-process with *DATABASE_FREQUENCY_BINARY_D3ACS. Results can be compared with the example ''BEM acoustics of a simplified compartment model''. Example 9.1 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.