Workflow Example for Water Hammer

This section contains a brief summary describing how to set up Water Hammer when creating a new project based on a steady state model.

1. Add a wave speed value to every pipe
2. Make sure every junction node has elevation defined
3. Use hydraulic time step of 0.01 or 0.05 sec for networks in towns and 0.1 sec for large transmission systems
4. Use report time step of 0.5 - 1 sec or 0.1 sec (as in above case)
5. From the 'Water hammer' tab in the 'Simulation setup' editor, set theta to 0.505 - 0.51 for better stability
6. You do not need any water hammer boundaries for tanks/reservoirs (they are set automatically by the program)
7. You do not need any water hammer boundaries for junction node demands (they are set automatically by the program)
8. Apply a user-defined pipe length of 10 m for all pipes that have a geometric shape length < 10m (for numerical stability purposes)
9. If you have pump stations with multiple pumps, close (= remove) all but 1 for the transient mode and use the equivalent pump characteristics
10. Change all valves to TCV, e.g. PRV and PSV or FCV valves need to be replaced by a TCV with a setting (local loss) that will give the same pressures/flows
11. You might need to add a TCV valve to an air-chamber connecting pipe and close it initially and open with the pump failure
12. If you have any inflows into the system, Q(t) boundary conditions must have positive flow values (negative flow values corresponding to an outflow).