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#1 |
Senior Member
Cyprien
Join Date: Feb 2010
Location: Stanford University
Posts: 299
Rep Power: 18 ![]() |
Hi !
I want to set up an equation from the knowledge of a flux. My equation has the following form: Code:
ddt(S)+div(phib)=0 As inlet boundary condition, I want to impose a constant flux phib0. Moreover with such inlet, I have been told that S do not need any BC. Is there a simple manner to do that ? Best regards, Cyp |
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#2 |
Senior Member
Cyprien
Join Date: Feb 2010
Location: Stanford University
Posts: 299
Rep Power: 18 ![]() |
Hi everybody!
I am still on this problem : i do not succeed to impose a flux at the inlet without set up a BC fixedValue for my field S... May be I should try a specific BC ?? which one ? I hope you can unblock me.... Regards, Cyp |
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#3 |
New Member
Gert Jan Auwerda
Join Date: Jan 2011
Posts: 3
Rep Power: 16 ![]() |
Hi I have the exact same question. I have a CFD problem where I have a fixed mass flux at the inlet and a fixed pressure at the outlet.
As the pressure at inlet will depend on flow properties, the inlet pressure is not known in advance. As the density depends on this pressure, I do no know the inlet velocity. So is there a velocity BC, which lets me input a fixed (total) flux, from which inlet velocity BC is derived? I can make a decent guess of course, but I want to be exact. And running the code a few times, adjusting manually my inflow BC seems a really stupid way. I cannot believe this BC does not exist, it is so common in CFD problems! Please help! |
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#4 |
Member
Join Date: Jun 2010
Posts: 33
Rep Power: 16 ![]() |
Hello,
do you mean? boundaryField { Inlet { type flowRateInletVelocity; flowRate 2.8; // [kg/s] value uniform (0 0 0); // only place holder } Regards, Ralph |
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#5 |
New Member
Gert Jan Auwerda
Join Date: Jan 2011
Posts: 3
Rep Power: 16 ![]() |
Ah yes, that is the one I was looking for. Thank you very much!
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