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Hi all, I'm trying to apply a boundary load (F/area) in the solid mechanics module where the load would look like: T(Pascals)=-C(Pas/m)V(m/s) where T is the Force/area, C is some constant, and V is the velocity of the boundary. I'm working with frequency domain and eigenfrequency studies. I know both the velocity only acts in the x direction in a 2D example. The velocity comes from piezoelectric shearing.

Using the Boundary Load->Load type: Load defined as force per unit area->Fa: user definied: -Csolid.u_tX or -Csolid.uAmptX seem to work as expected. uAmp gives me an unknown variable error, and utX doesn't seem to make a theoretical prediction based on the calculated velocity. I get a load with half the period of the velocity.

Is there a good way to apply a boundary load using the velocity of the boundary? (Using 5.2a)

Thank you,