AFT Impulse checks the model with the Waterhammer Assistant before a transient simulation to see if it has any advice. If it does, the Waterhammer Assistant is displayed. The user then has the option of canceling the run to take the suggested actions or ignoring the advice and continuing. If you do not want the Waterhammer Assistant to be consulted before each run, you can specify this choice in the User Options window on the Tools menu. The Waterhammer Assistant can also be opened from the Help menu.

An example of something the Waterhammer Assistant will check for is if there are any pipes that could be combined to reduce runtimes using the Combine Pipes tool.