Pumpsim

Pumpsim is a 3D flow simulation software for pipe networks. The program allows you to design, optimize, and simulate your pump and liquid reticulation system.

You can build a network of pipes, channels, pumps, tanks, valves, and sprays to simulate flows and pressures of liquids, slurries, and many other fluids. Also, the program includes a Dynamic Simulation feature that allows for the simulation of pump/pipe model behavior over a period of time.