Hi Michael,
Autodesk Algor can do flow visualization via CFD. Here is an intake manifold I'm designing for an inline-6 cylinder engine. It is just steady-state and a non-changing mesh.
If you really want to model the intake and exhaust valves opening and closing, then you would need the mesh to change dynamically (volume and shape changing with time). If you need that, I'm afraid that we may not have what you're looking for (I'm not 100% positive on this the Algor team would be able to answer your questions). {color:#c0c0c0}I've
heard FIDAP or Star-CMM+ can do it.
{color}{color:#000000}Thanks, -Hugh{color}
Hugh Henderson
QA Engineer (Fusion Simulation)