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For Velocity, enter the components of the vibrating surface velocity v. This could be the velocity that results from modeling a vibrating surface like the hull of a ship or and engine. For example, if the vibrating object is modeled by a Solid Mechanics interface, then enter the velocities as solid.u_tX, solid.u_tY, and solid.u_tZ, respectively.
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For Normal velocity, enter the normal velocity vn (SI unit: m/s). This is the normal velocity pointing into the infinite fluid domain. This can be a constant, an expression that depends on space coordinates, or it can be taken from the solution of another model.
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For User defined, enter the pressure p (SI unit: Pa) and t the normal velocity vn (SI unit: m/s) defined at the given boundary. This option gives full user control of the input to the Kirchoff-Helmholtz integral that is set up by the Exterior Field Calculation feature.
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