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Forum: CFX June 13, 2022, 05:41
Replies: 17
Views: 7,149
Posted By ghorrocks
The absolute pressure and pressure variables are...

The absolute pressure and pressure variables are the same, just with an offset of the reference pressure. So if you are getting a pressure of -5 bar and your reference pressure is 6 bar then there is...
Forum: CFX January 3, 2014, 05:38
Replies: 17
Views: 7,149
Posted By ghorrocks
That general question is a FAQ:...

That general question is a FAQ: http://www.cfd-online.com/Wiki/Ansys_FAQ#Why_are_my_results_inaccurate.3F
Forum: CFX January 3, 2014, 05:15
Replies: 17
Views: 7,149
Posted By ghorrocks
This thread already discusses what to do about...

This thread already discusses what to do about the negative pressures. Have you read the other posts on this thread?
Forum: CFX February 15, 2011, 16:49
Replies: 17
Views: 7,149
Posted By ghorrocks
Looks like this can be modelled with a single...

Looks like this can be modelled with a single rotating frame of reference.

But be aware I think your inlet and outlet bounadries are too close to your impeller to get good results or convergence.
Forum: CFX February 12, 2011, 05:32
Replies: 17
Views: 7,149
Posted By ghorrocks
Sorry, I do not understand your question. Can you...

Sorry, I do not understand your question. Can you explain it again?
Forum: CFX February 9, 2011, 18:38
Replies: 17
Views: 7,149
Posted By ghorrocks
Yes, cavitation modelling is multiphase. But as I...

Yes, cavitation modelling is multiphase. But as I said before - don't do a cavitation model. Until you have the basics under control a cavitation model will not help.
Forum: CFX February 8, 2011, 17:19
Replies: 17
Views: 7,149
Posted By ghorrocks
I have already explained what the -30 bar...

I have already explained what the -30 bar pressure is about.

Whether your y+ is good enough has to be established by a sensitivity analysis.

The wall at the boundary has been asked many times...
Forum: CFX February 7, 2011, 16:39
Replies: 17
Views: 7,149
Posted By ghorrocks
Assuming the effect you have modelled is real: ...

Assuming the effect you have modelled is real:

It is quite common for incompressible simulations to give negative absolute pressures. Physically what happens is a small cavitation bubble forms and...
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