|
[Sponsors] |
![]() |
![]() |
#1 |
Member
Francesco Capuano
Join Date: May 2010
Posts: 81
Rep Power: 16 ![]() |
Hi,
I would like to model a radiative and convective heat transfer through a wall. In practice, I would need an equilibrium boundary condition of the type ![]() where ![]() ![]() Is there any available boundary condition to model such problem? Or, did anyone encounter the same issue (and maybe developed a customized b.c.)? Many thanks in advance. |
|
![]() |
![]() |
![]() |
![]() |
#2 |
Senior Member
Anton Kidess
Join Date: May 2009
Location: Germany
Posts: 1,377
Rep Power: 30 ![]() |
A mixed boundary condition (i.e. groovyBC) should do the trick. I'm sure you can find a copy&paste solution here on the forum.
__________________
*On twitter @akidTwit *Spend as much time formulating your questions as you expect people to spend on their answer. |
|
![]() |
![]() |
![]() |
![]() |
#3 |
New Member
Napoli
Join Date: Oct 2015
Posts: 2
Rep Power: 0 ![]() |
We successfully modeled it with this implementation in file 'T' in directory '0'
boundaryField { fixedWalls { type groovyBC; refValue uniform 288; refGradient uniform 0; valueFraction uniform 1; value uniform 288; valueExpression "0"; gradientExpression "h*(T-Tinf)+(sigma)*E*(T*T*T*T-Tinf*Tinf*Tinf*Tinf)"; fractionExpression "0"; evaluateDuringConstruction 0; variables 4 ( "h=50;" "sigma=5.6e-8;" "E=0.8;" "Tinf=288;" ) ; After, we was forced to change the string thermoType>energy from 'sensibleEnthalpy' to 'sensibleInternalEnergy' in file 'thermophysicalProperties' in directory 'constant' for other reasons and we obtained a floating point exception error. What is the problem? Is there an alternative method to implement heat transfer written above? |
|
![]() |
![]() |
![]() |
Tags |
heat transfer, radiation, wall boundary condition |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
Domain Imbalance | HMR | CFX | 5 | October 10, 2016 05:57 |
Thin Wall Heat Transfer BC for rhoSimpleFoam | swahono | OpenFOAM Running, Solving & CFD | 12 | October 4, 2013 11:49 |
Question about heat transfer coefficient setting for CFX | Anna Tian | CFX | 1 | June 16, 2013 06:28 |
Low Mixing time Problem | Mavier | CFX | 5 | April 29, 2013 00:00 |
Enforce bounds error with heat loss boundary condition at solid walls | Chander | CFX | 2 | May 1, 2012 20:11 |