Short answer: Flow Sim isn't well suited for this project.
SW Flow Simulation can't do moving parts. Once it meshes the model, whether a given node is solid or fluid is fixed and can't change as would be required for moving parts. The only thing you might be able to work is defining the time step to make configurations of the bullet in various positions and solve a series of transient simulations based on that time step.
Ah, thats what I expected. Thank you very much for such a quick responce.
So what would be a solution to this? I am trying to build my senior design project and have the same issue? I have moving components that includes spring which is attached to pressure input. Can you please suggest that can simulate moving parts for flow simulation?