Hi Team,
I have been going through your tutorial models and I came across the centrifugal pump model where I can't seem to figure out.
Here's a video from your AU class: http://au.autodesk.com/au-online/classes-on-demand/class-catalog/classes/year-2017/simulation-cfd-36... (you might want to go to timestep 19:00 where the boundary conditions are applied).
Also go through this tutorial of a similar pump model: https://knowledge.autodesk.com/support/cfd/learn-explore/caas/CloudHelp/cloudhelp/2014/ENU/SimCFD/fi...
In the video, can you explain why we have a zero pressure inlet and but specified flow rate for the outlet. Taking into account that we have specified the parameters of the rotating region. Isn't this model over-constrained?
The set up in the tutorial page makes more sense since we specified a zero pressure inlet and outlet. We allow the flow to be generated (only) by the rotating region.
Please, what am I missing?
Thanks,
Nnaemeka
Solved! Go to Solution.
Solved by Jon.Wilde. Go to Solution.
Hi Nnaemeka, welcome to our CFD forum 🙂
Pumps generate a pressure rise and so there should be a higher pressure at the outlet than the inlet.
We tend to pull flow out and have a P=0 at the inlet, then CFD predicts the outlet pressure.
If we swap the conditions, we get into negative pressures, which are not as simple for the solver.
You can also run P=0 at both, this is simply an open flow condition which represents a different point on the pump curve.
Assigning various outlet flow rates simply gives you a different point on the curve. These models are not over constrained.
Does that answer your question?
Thanks!
Jon
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