[javat33489]

Hi all.
I am interested in the calculation of a centrifugal pump in fluent.

The video sets the inlet pressure to 0, which means atmospheric pressure, and the outlet flow. Fine. In real life, a centrifugal pump does not work like that, it needs to gain pressure, it is first launched onto a closed valve and then it is slowly opened to equalize the pressure, so the outlet pressure can be, for example, 10 MPa.

So how can I carry out such a trick? My pump produces a nominal output of 500 m3/day. Can I set the inlet flow and mute the outlet? Then I will look at the graph of the pressure in the pump cavity, when the pressure increases, I will stop the calculation and increase the outlet diameter each time, for example 0, 10, 50 and 100 mm - this is the desired diameter. Will the pump reach the required pressure?
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I calculated the pump as an ansis video, the inlet pressure is 0 and the outlet flow rate is 500 m3/day. But with this condition, I have a lot of negative pressure. Why?