A road tanker partly filled with liquid can create high loads from a sudden acceleration or driving around sharp corners at speed. CFD provides an effective way to analyse these loads and see how the liquid is moving inside the tank creating these high loads. Another application of free fluid flow is floodgate applications when the gates are opened. The output here can be an erosion of the bottom structure (or how to avoid it), suitable opening speeds to reduce currents and loads on the ports.
Symetri can also help you via consultancy in the event you are under tight timescales.