what is the useage of pRefCell/pRefvalue

lg88 · November 5, 2011, 00:27

hi everyone.
when i run my case,a suggestion said that i didn't set the pRefCell. Is it necessary to set the pRefCell in every case? what is the useage of pRefCell/pRefValue ?

nimasam · November 5, 2011, 01:57

not every case, just for incompressible solver! because what is important in incompressible flow is not the exact value of pressure, just the difference between pressure! so it just defines a reference, and if i was not wrong, imagine you have a field of pressure with zeroGradient boundary condition! (for example a liquid in a closed box) ,your boundary condition is some how poor, you only knows the gradient not the value! so that point give you a reference to calculate pressure distribution

zakir hussain · November 5, 2011, 07:06

So it is!
Thank you very much!

zakir

November 5, 2011, 00:27	what is the useage of pRefCell/pRefvalue	#1
lg88 Member jack Join Date: Jul 2011 Posts: 52 Rep Power: 14	hi everyone. when i run my case,a suggestion said that i didn't set the pRefCell. Is it necessary to set the pRefCell in every case? what is the useage of pRefCell/pRefValue ?

November 5, 2011, 01:57		#2
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,266 Blog Entries: 1 Rep Power: 24	not every case, just for incompressible solver! because what is important in incompressible flow is not the exact value of pressure, just the difference between pressure! so it just defines a reference, and if i was not wrong, imagine you have a field of pressure with zeroGradient boundary condition! (for example a liquid in a closed box) ,your boundary condition is some how poor, you only knows the gradient not the value! so that point give you a reference to calculate pressure distribution

November 5, 2011, 07:06		#3
zakir hussain Member zakir Join Date: Nov 2011 Posts: 44 Rep Power: 14	So it is! Thank you very much! zakir