Ansys Fluent - Centrifugal Pump
Written by cfd.ninja
In a centrifugal pump the impeller adds energy to the fluid and the volute turns part of that velocity into pressure. A CFD model gives you the head and the torque at each operating point, and therefore the efficiency, plus the low pressure regions where cavitation is likely to appear.
The domain is normally split into two cell zones: the impeller, solved in a rotating reference frame, and the volute, which stays still. With a Moving Reference Frame the simulation remains steady, which is enough to build a performance curve. When you need the blade passing effect in time, the sliding mesh approach replaces it.
The mesh decides how much you can trust the head and the torque. Inflation layers on the blades and the volute walls are not optional, and the height of the first layer should come from the y+ your turbulence model expects. You can work it out with the Y+ calculator.
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