Pump CFD Analysis
Pump CFD Analysis
(OP)
Hi All
I've recently been trying to model one of my company's pumps so that i can later use CFD to predict the performance of new designs.
My results seem to be quite close at higher flows which I'm happy with, but at high pressures (low flows) my pressure is significantly down on the measured value.
What would be causing this?
I'm using SolidWorks Flow Simulation, which i know isn't the best, but it's all I've got for now.
Any help would be much appreciated.
Cheers
I've recently been trying to model one of my company's pumps so that i can later use CFD to predict the performance of new designs.
My results seem to be quite close at higher flows which I'm happy with, but at high pressures (low flows) my pressure is significantly down on the measured value.
What would be causing this?
I'm using SolidWorks Flow Simulation, which i know isn't the best, but it's all I've got for now.
Any help would be much appreciated.
Cheers





RE: Pump CFD Analysis
3.6 m3/hr at 2000 bar? (200000 kPa)
At that sort of pressure and size any small error will become important and also you can get some strange effects which become negligible as you go higher
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Pump CFD Analysis
sorry for the off topic.
RE: Pump CFD Analysis
RE: Pump CFD Analysis
Are you able to post plots/contours of streamline velocities and pressures from your CFD calculations. Also if you could give some details about the pump: type, size, impeller diameter, etc.
RE: Pump CFD Analysis
You are all correct, that pressure is far too high. The units are actually Pa, but I wrote kPa on the axis.
It's a fairly simple centrifical pump.
I've started using a transient analysis, which is giving better (higher) pressure, but still not accurate enough. I'm getting 182 kPa, chasing 195-200 kPa.
There seems to be recirculation at the outlet, but not at the inlet.
Please excuse my ignorance, but how does recirculation increase the pressure? I thought it would decrease it.
Thanks for the input.
RE: Pump CFD Analysis
You should to get certain amount of recirculation at the inlet of the impeller whilst at part-load conditions - as noticeable as the one you are getting at the outlet.
What turbulence model are you using? Are you specifying a value of the +y? How many nodes do you have for the impeller, diffuser and collector?
RE: Pump CFD Analysis