# difference between inletValue and value in inletOutlet B.C.

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 May 29, 2011, 07:34 difference between inletValue and value in inletOutlet B.C. #1 Member   Hossein Join Date: Apr 2010 Posts: 65 Rep Power: 9 Dear foamers I try to run a case and have a problem with inletOutlet Boundary condition. What is the difference between the inletValue and value in this B.C.? It seems that they have a same value in most of the cases. regards, Moha

 May 29, 2011, 10:31 #2 Senior Member     su junwei Join Date: Mar 2009 Location: Xi'an China Posts: 151 Rep Power: 12 inletOutlet is a back flow boundary condition for outlet. If fluid attepts to flow inwards, it applies a fixed value velocity assigned by inletValue for that given patch face. Or, it use zerogradient. InletValue is the value flow inwards you have to give. value is the actual value for the given patch. given by inletValue or patchface neighbour cell(zerogradient). Hope this helps. regards, Junwei

 May 29, 2011, 22:43 #3 Member   Hossein Join Date: Apr 2010 Posts: 65 Rep Power: 9 Thanks for your answer. It was useful for me.

May 30, 2011, 13:28
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Santiago Marquez Damian
Join Date: Aug 2009
Location: Santa Fe, Santa Fe, Argentina
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Junwei, your explanation about inletValue is clear for me but the one for value isn't.

Quote:
 Originally Posted by su_junwei InletValue is the value flow inwards you have to give. value is the actual value for the given patch. given by inletValue or patchface neighbour cell(zerogradient).
Suppose you want a velocity pointing only outwards. It would be zeroGradient if velocity is outwards and (0 0 0) if it is inwards. I suppose inletValue should be (0 0 0) and it would represent the inlet velocity. Then what is the purpose of the "value" entry?.

Regards.
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 May 30, 2011, 21:01 #5 Senior Member     su junwei Join Date: Mar 2009 Location: Xi'an China Posts: 151 Rep Power: 12 value is a keyword for all the numerical boundary condition. It is not used for input but calculated based on the boundary you set. It is useful for postprocessing. you can set the same value as inletValue, and it will be updated during the calculation. sometimes, paraview don't like boundary condition without "value" entry. Regards, Junwei calim_cfd likes this.

 May 30, 2011, 21:42 #6 Senior Member     Santiago Marquez Damian Join Date: Aug 2009 Location: Santa Fe, Santa Fe, Argentina Posts: 438 Rep Power: 17 Junwei, thanks for the clarification and confirmation. Tthat's true when values are calculated "value" entry data is replaced by which is calculated at running time. Regards. __________________ Santiago MÁRQUEZ DAMIÁN, Ph.D. Research Scientist Research Center for Computational Methods (CIMEC) - CONICET/UNL Tel: 54-342-4511594 Int. 7032 Colectora Ruta Nac. 168 / Paraje El Pozo (3000) Santa Fe - Argentina. http://www.cimec.org.ar

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