Temperature dependant mixed Boundary condition

argonaut · October 28, 2010, 12:56

Hello,

I have a solid body, and I calculate temperature in it by laplacianFoam. One of its patches has boundary condition like this:

dT/dn + alpha(T) * (T-Tenv) = 0

where alpha(T) is non-linear function taking temperature on the surface as argument, but Tenv is a constant (temperature of environment)

By what means I can set such boundary condition in OpenFoam. I have found some threads about making my own BC already, but still I could not understand where I should start. Maybe there is a similar BC shipped with OpenFOAM, but I don't know. alpha(T) incorporates heat convection and heat radiation (and divided by conductivity of the material)

Raimonds

nimasam · October 28, 2010, 15:47

hi friend
are you familiar with groovyBC ? if not, search it in openFoam wiki
ur boundary condition is a combination fixedValue and fixedGradient and you can use this utility

argonaut · February 15, 2011, 12:02

Thanks for your advice, I have started to get into it. Although, it is not so easy to implement Robin boundary conditions as I expected. See, e.g. this post

October 28, 2010, 12:56	Temperature dependant mixed Boundary condition	#1
argonaut New Member Raimonds Vilums Join Date: Oct 2010 Posts: 17 Rep Power: 16	Hello, I have a solid body, and I calculate temperature in it by laplacianFoam. One of its patches has boundary condition like this: dT/dn + alpha(T) * (T-Tenv) = 0 where alpha(T) is non-linear function taking temperature on the surface as argument, but Tenv is a constant (temperature of environment) By what means I can set such boundary condition in OpenFoam. I have found some threads about making my own BC already, but still I could not understand where I should start. Maybe there is a similar BC shipped with OpenFOAM, but I don't know. alpha(T) incorporates heat convection and heat radiation (and divided by conductivity of the material) Raimonds

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October 28, 2010, 15:47		#2
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,266 Blog Entries: 1 Rep Power: 24	hi friend are you familiar with groovyBC ? if not, search it in openFoam wiki ur boundary condition is a combination fixedValue and fixedGradient and you can use this utility

February 15, 2011, 12:02		#3
argonaut New Member Raimonds Vilums Join Date: Oct 2010 Posts: 17 Rep Power: 16	Thanks for your advice, I have started to get into it. Although, it is not so easy to implement Robin boundary conditions as I expected. See, e.g. this post