Reply To: How to apply displacement derivative dependent force on bunch of nodes in apdl?

[Mehdi Baghaee]

Thanks for your help.

instead of using delta_uz_11/dt (dW(x,y,z,t)/dt), why don't use VZ(11)? 

And also can use TAN(ROTX(11)) instead of delta_uz_11/delta_ux_11 for dW(x,y,z,t)/dx?

Note W(x,y,z,t) is the displacement of nodes in z direction in current time t.