I'm working with simulations for my thesis and I have some problems with Ls-Dyna. It is possible to assign the same velocity value to every inlet's cell in a CFD simulation? I'm using ICFD_Prescribed_Vel keyword for the inlet boundary condition but I'm confused about the way in which Ls-Dyna assign the values defined to the cells.
Are you going to study how the fluid reacts to something in the simulation? Because I'm pretty sure that *ICFD_Boundary_Prescribed_Vel will "prescribe" the fluid to move in a certain way, it will not react. This is true for most things in LS-Dyna that are Boundary_Prescribed.
You can also try *ICFD_Initial to prescribe an initial velocity in the x,y, or z direction.
Let me know if this was helpful, sorry, CFD is not my forte.