[nwpukaka]

Dear Foamer,

solver: laplacianFoam
openfoam: foam-extend-3.0

I am using groovyBC to prescribe a neumann boundary condition in my heat conduction analysis, the gradient value will be updated during the simulations. however, it always return a zero gradient value, can someone check my setup of boundary condition for temperature?

OF_wall_01
{
type groovyBC;
value $internalField
gradientExpression "gt";
fractionExpression "0"
variables (
    "T_ambinet = 3.000000e+02;"
    "k = 1.454000e+01;"
    "hfc = 100.0;"
    "gt = hfc*(T-T_ambinet)/k;"
);
}

I also tried to set a valueExpression, where I think the value should be constant as 300.0.

OF_wall_01
{
    type groovyBC;
    value $internalField
    valueExpression "300.0";
    fractionExpression "1"
}

However, it is surprised to me that the temperature field is reduced to 1.9 K.

Thank you in advance!
Kan