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using buoyantBoussineqPimpleFoam for Laminar free convection

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Old   June 13, 2014, 16:31
Default using buoyantBoussineqPimpleFoam for Laminar free convection
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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!
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Old   June 13, 2014, 18:40
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just delete them!
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Old   June 14, 2014, 06:32
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Quote:
Originally Posted by adambarfi View Post
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??
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Old   June 14, 2014, 07:43
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Quote:
Originally Posted by realfear View Post
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
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Old   June 15, 2014, 05:52
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Another question
what is the meaning of asymptotic steady state solution ????
what is that??
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Old   June 16, 2014, 07:01
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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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