Is it possible to model a fixed flow variable speed pump where the flow changes over time? For example a logical control to change the target flow.
As of version 10.03.02.75, there is currently not a direct way of doing this at this time due to technical reasons (although target pressure and target HGL for fixed head VSPs is available). There are a few options that are available to you. First, you could model this as a pattern-based variable speed pump instead. This would require trial and error to determine the pump speed that results in the desired fixed flow.
A simpler solution would be to omit the pump altogether and model the flow from the pump as an inflow node. This is basically using a junction with a negative demand. The negative demand can follow a pattern, which would allow you to control the flow going into the system.
We will investigate including target flow as an available control action for a future release. Reference Enhancement # 782645