Hello,
I am analzing one network with two different scenarios of flow and head(keeping all remaining parameter same) in hammer. I am getting that maximum pressure in the network for less flow and low head scenario exceeding from maximum pressure in the network for large flow and high head scenario under power failure condition. But In general, maximum pressure in the network for less flow and low head scenario be less as compare to maximum pressure in the network for large flow and high head scenario.
Please clarify why maximum pressure in the network for less flow and low head scenario exceeds from maximum pressure in the network for large flow and high head scenario.
Regards,
Ankit Kumar
Hello Ankit,
Can you explain more about these two conditions that you are comparing? Are you referring to high/low flow/pressure during the initial conditions, transient or both? What type of transient event?
Generally speaking, higher flow conditions during a transient tend to produce less conservative results (lower surge impact) because friction dissipates transient energy, while lower flow conditions tend to produce more severe transient conditions because there isn't as much friction to dissipate the transient energy. See related article that mentions this: What kind of demands should be used as the initial conditions of a transient simulation?
However, there can be many other factors at play during a transient simulation, such as check valve closure, vapor or air pocket formation and collapse, just to name a few. If you have not done so already, be sure to animate your profile paths in the Transient Results Viewer.
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.