The Normal Velocity adds an inward normal velocity either given as a scalar vn or as a velocity vector vb, the condition given is
where n is the surface normal. Both expressions should be functions of time. This feature represents an external source term. It can also be used to model a vibrating transducer surface or other vibrating surfaces.
Select a Type — Inward Velocity (the default) or Velocity.
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For Inward Velocity enter an expression for the Inward velocityvn(t) (SI unit: m/s). Use a positive value for inward velocity or a negative value for outward velocity.
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For Velocity enter expressions for the components of the Velocityvb(t) (SI unit: m/s).
