Whole impeller or part of impeller?

henriquempr · October 27, 2020, 09:17

Hi

I'm doing a CFX simulation of centrifugal fan (impeller + volute) with 11-blade impeller. Will the simulation of just one blade (impeller is symmetrical) to save computational effort cause false results, since the volute is not symmetrical?

Can someone help me?

Thanks.

Opaque · October 27, 2020, 09:52

It will definitely not give the most accurate results.

The question is: what are you trying to achieve out of your simulations?, and what level of approximation you are willing to accept.?

You may set it up with the full wheel/impeller, and still not make the best model selection and it will not give you the most accurate results

Summary: there is no free lunch.

henriquempr · October 27, 2020, 10:23

Hi Opaque.

I intend to obtain mass flow average value of pressure and total pressure stn frame at impeller inlet, impeller/volute interface and volute outlet.

October 27, 2020, 09:17	Whole impeller or part of impeller?	#1
henriquempr New Member Henrique Join Date: Jan 2020 Posts: 9 Rep Power: 6	Hi I'm doing a CFX simulation of centrifugal fan (impeller + volute) with 11-blade impeller. Will the simulation of just one blade (impeller is symmetrical) to save computational effort cause false results, since the volute is not symmetrical? Can someone help me? Thanks.

October 27, 2020, 09:52		#2
Opaque Senior Member Join Date: Jun 2009 Posts: 1,880 Rep Power: 33	It will definitely not give the most accurate results. The question is: what are you trying to achieve out of your simulations?, and what level of approximation you are willing to accept.? You may set it up with the full wheel/impeller, and still not make the best model selection and it will not give you the most accurate results Summary: there is no free lunch. henriquempr likes this. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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October 27, 2020, 10:23		#3
henriquempr New Member Henrique Join Date: Jan 2020 Posts: 9 Rep Power: 6	Hi Opaque. I intend to obtain mass flow average value of pressure and total pressure stn frame at impeller inlet, impeller/volute interface and volute outlet.