Pump flow bump

Introduction

When a pump is turned on, it will take some time for the flow to ramp up from 0 to its pumping capacity. Just like it takes a car some time from stop to reach 60mph.

Time step matters

What I found is that if I change the model timestep from 15 seconds to 30 seconds, the small bump is gone.

Conclusion

In the model, pumps are modeled in rather simplistic manner, and the way it can ramp up in no time is far from realistic. And this can cause a little bump when the flow is discharged into the downstream pipe.

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