heat transfer boussinesq

Andrev · October 13, 2011, 16:02

Dear Foam s,
please

can anyone tell me how can I set a fixed heat flux on a wall using buoyantBoussinesqPimpleFoam?

On the temperature file (T and T.org), if I set temperature as a fixedGradient, does it works?

like grad (T) = qflux / k.

Thanks for the attention.

nimasam · October 15, 2011, 10:10

it depends ur k is fixed or not
1) if your k is fixed so use the fix Gradient for temperature

2) if your k is variable and change during simulation use groovyBC, to read k in each simulation and divide it into fixed qflux. (you can find in froum more

)

Andrev · October 18, 2011, 17:30

Thanks for the help.

I'm having problems with the time step of my case,
when I set a fixedGradient to define heat flux ( k constant), if I increase the time step on controlDict, the results change too: temperature increases...

Anyone know what am I doing wrong ?

Thanks for the attention.

October 13, 2011, 16:02	heat transfer boussinesq	#1
Andrev New Member AV. Join Date: Apr 2011 Posts: 14 Rep Power: 15	Dear Foam s, please can anyone tell me how can I set a fixed heat flux on a wall using buoyantBoussinesqPimpleFoam? On the temperature file (T and T.org), if I set temperature as a fixedGradient, does it works? like grad (T) = qflux / k. Thanks for the attention.

October 15, 2011, 10:10		#2
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,267 Blog Entries: 1 Rep Power: 25	it depends ur k is fixed or not 1) if your k is fixed so use the fix Gradient for temperature 2) if your k is variable and change during simulation use groovyBC, to read k in each simulation and divide it into fixed qflux. (you can find in froum more ) Andrev likes this.

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October 18, 2011, 17:30		#3
Andrev New Member AV. Join Date: Apr 2011 Posts: 14 Rep Power: 15	Thanks for the help. I'm having problems with the time step of my case, when I set a fixedGradient to define heat flux ( k constant), if I increase the time step on controlDict, the results change too: temperature increases... Anyone know what am I doing wrong ? Thanks for the attention.