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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 10.00.00.55, there is currently not a direct way of doing this at this time. 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.