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September 9, 2010, 07:55 |
setup of inital condition
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#1 |
New Member
Silvia Di Francesco
Join Date: Jun 2010
Posts: 9
Rep Power: 15 |
hi
I would like to simulate an unsteady flow with a linear thermal gradient (with the vertical depth Z) at inlet. The all dominion should be initialized with the same gradient. How can I impose these value of temperature to the internal mesh? the simplified problem is something like the image attached. Suggestion about the solver to use? Thanks Silvia |
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September 10, 2010, 13:14 |
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#2 |
Member
edison
Join Date: May 2009
Location: Australia
Posts: 35
Rep Power: 16 |
You may need to do some modification on the source code for new inlet boundary. http://www.tfd.chalmers.se/~hani/kur...yCondition.pdf
This pdf may help you find a way. |
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September 10, 2010, 13:25 |
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#3 |
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edison
Join Date: May 2009
Location: Australia
Posts: 35
Rep Power: 16 |
actually, it may be easier that. Take a look at the discussion http://www.cfd-online.com/Forums/ope...-openfoam.html
and then check the user guide 4.2.9. Hope it may help. |
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September 10, 2010, 14:52 |
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#4 |
Senior Member
Santiago Marquez Damian
Join Date: Aug 2009
Location: Santa Fe, Santa Fe, Argentina
Posts: 452
Rep Power: 23 |
Did you try funkySetFields?
Bye.
__________________
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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September 23, 2010, 13:30 |
bouyantboussinesqpimpleFoam
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#5 |
New Member
Silvia Di Francesco
Join Date: Jun 2010
Posts: 9
Rep Power: 15 |
thanks for the suggestions. I used funkysetfields for temperature gradient and
timeVaryingUniformFixedValue for unsteady conditions at inlet. The fluid to simlate to is water, so uncompressible About the solver: I tried to use bouyantboussinesqpimpleFoam putting the following boundary conditions: U internalField uniform (0 0 0); boundaryField { inlet : timeVaryingUniformFixedValue; outlet: zeroGradient; bottom fixed value uniform (0 0 0); atmosphere zeroGradient; defaultFaces empty (2D case) } T inlet type fixedValue; value nonuniform All other boundaries are set as zerogradient. p inlet { type zeroGradient; } outlet { type fixedValue; value uniform 0; } bottom { type zeroGradient; } atmosphere { type fixedValue; value uniform 0; defaultFaces { type empty; For thermopysical aspect I use the folowing: thermoType hPsiThermo<pureMixture<constTransport<specieThermo <hConstThermo<icoPolynomial>>>>>; mixture water 1 18 4190 0 1.001e-03 10; pRef 100000; I tried with and without gravity but the temperature field seems to become crazy, with value too high! Did I make some big mistake or should I consider a different solver? and which one? thank you Silvia |
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