hello i a attaching my model file with this please can you let me know why this error is showing in my run for behrampur scenario
41890 "Behrampur" "(N/A)" "-1" "(N/A)" 0.000 "Negative pressures in system at one or more time steps." Pressure Engine
also i have made controls in pumps can you please see if it is ok
Hello Rahul,
As mentioned by Joeri, the negative pressures that you see in the model is on suction side of pump, as reservoir elevation and pump elevations are same so pressure reported is zero, this is observed very often.
Raising the elevation of the reservoir a little would fix this. You can find more information on negative pressure in a water model at the following link: Troubleshooting negative pressures at pumps, junctions, and other node elements.
Calculating Net Positive Suction Head (NPSH)
About controls in the model, pumps are operating as per set controls so it looks correct, here is more information on modeling time based controls so you can combine controls together for same element.
Using "Clock Time" and "Time From Start" Controls
Regards,
Sushma Choure
Bentley Technical Suppport
This was helpful. Thank you. I had the same issue and moved the elevation of the reservoir up by one foot and it solved the warning.