# initial velocity field with a pressure difference

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 July 23, 2009, 04:20 initial velocity field with a pressure difference #1 Member   Sven Degner Join Date: Mar 2009 Location: Zürich Posts: 55 Rep Power: 10 hi, Im not really sure about my initial fields, and i hope everyone help me with this problem. first of all I create a simple geometries. For the next step I will initial my p and U fields . The problem now my velocity field is define by a pressure difference . The question is that the correct definition, for this problem? /************************************** p *************/ outlet { type fixedValue; value uniform -50000; } inlet { type zeroGradient; } . . . /************************************************** ***/ /************************************** U *************/ outlet { type zeroGradient; } inlet { type zeroGradient; } . . . /************************************************** ***/

 July 23, 2009, 04:59 #2 Member   Julien Schaguene Join Date: Apr 2009 Location: France Posts: 55 Rep Power: 10 Hi, I think there is something missing here. If you want your flow to be defined by a pressure difference, you have to put fixedValue to outlet AND inlet, otherwise your domain is going to have a uniform relative pressure equal to -50000, and in theory no velocity... For further precision, we'll need explanations on geometry, solver used...

 July 23, 2009, 05:05 #3 Member   Join Date: Mar 2009 Location: Norway Posts: 97 Rep Power: 10 Also, this seems to be the boundary condition - not actually the initial field? The initial condition can be set in the internalField, located above you boundaryField. For example internalField uniform ; .

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