[Simeone_Parolisi]

Hi,
I successfully modeled a radiative and convective heat transfer through a wall



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, I was forced to change the string thermoType>energy from 'sensibleEnthalpy' to 'sensibleInternalEnergy' in file 'thermophysicalProperties' in directory 'constant' for other reasons and I obtain a floating point exception error.
What is the problem? Is there an alternative method to implement heat transfer written above?