I simulated the acoustic scattering of a plane wave on a rigid object in free-field and computed the total pressure at one point on the object's surface. I used Comsol's acoustics module and Boundary Element Method. The resulting pressure's magnitude exceeds 6dB (i.e. the resulting pressure is more than twice the initial pressure). This doesn't makes sense to me. Could someone help me clarify what's going on? Thanks.
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