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BEM acoustics with incident wave

An example of acoustic pressure scattered from a rigid spherical surface shows how to solve acoustiv scattering problems with *FREQUENCY_DOMAIN_ACOUSTIC_BEM and *FREQUENCY_DOMAIN_ACOUSTIC_INCIDENT_WAVE. Example 8.12 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.