# using buoyantBoussineqPimpleFoam for Laminar free convection

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 June 13, 2014, 15:31 using buoyantBoussineqPimpleFoam for Laminar free convection #1 New Member   Join Date: Mar 2014 Posts: 16 Rep Power: 3 Hi everybody first of all i will describe the model I'm trying to solve and the i will ask my questions i will be grateful to if any one could help me! I wanted to model laminar free convection flow in a simple cavity it is a asymptotic steady-state solution. i mean thermodynamical properties will remain constant except density . as i found out in forums we should set RASproperties to laminar and turn turbulence to off. here is my question: what should we do to insert laminar properties in "0" folder ?? what should we do to Kappa , nut and how we can insert these properties for laminar flows?? thanks in advance!

 June 13, 2014, 17:40 #2 Senior Member     Mostafa Mahmoudi Join Date: Jan 2012 Posts: 314 Rep Power: 6 just delete them!

June 14, 2014, 05:32
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Quote:
 Originally Posted by adambarfi just delete them!
tnx

then how should i give:
1-thermal conductivity
2-viscosity
and i guess i shoud delete K and epsilon in "0" folder too??

am i right??

June 14, 2014, 06:43
#4
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Mostafa Mahmoudi
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Quote:
 Originally Posted by realfear tnx then how should i give: 1-thermal conductivity 2-viscosity and i guess i shoud delete K and epsilon in "0" folder too?? am i right??
in transportProperties located in constant case you can specify nu and Pr number and you can extract the value of k from them.
u have a known Ra number then u should specify Pr and beta and nu in a way that the flow has the specified Rayleigh number

 June 15, 2014, 04:52 #5 New Member   Join Date: Mar 2014 Posts: 16 Rep Power: 3 Another question what is the meaning of asymptotic steady state solution ???? what is that??

 June 16, 2014, 06:01 #6 New Member   Join Date: Mar 2014 Posts: 16 Rep Power: 3 anybody knows how we should set P and P_rgh in "0" ??? in a cavity we can set internal field to atmospheric pressure and zero gradients on walls ?? for P_rgh we should calculate P_rgh=P-rho*g*h , but how we can calculate it over a vertical wall? it varies??

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