[alimea]

Hi
I want to calculate heat flux of a surface with the "wallHeatFlux". If I get a constant temperature BC, it gives me correct answer, but if I get "groovyBC" that is:

right
{
type groovyBC;
variables "k=0.6;alpha=2.85;Tinf=295;f=1/(1+k/(alpha*mag(delta())));";
valueExpression "Tinf";
gradientExpression "0";
fractionExpression "f";
value uniform 0;
}

it gives me this error:

#0 Foam::error:rintStack(Foam::Ostream&) at ??:?
#1 Foam::sigFpe::sigHandler(int) at ??:?
#2 in "/lib/x86_64-linux-gnu/libc.so.6"
#3 Foam::heRhoThermo<Foam::rhoThermo, Foam:ureMixture<Foam::constTransport<Foam::speci es::thermo<Foam::hConstThermo<Foam:erfectGas<Foa m::specie> >, Foam::sensibleEnthalpy> > > >::calculate() at ??:?
#4 Foam::basicThermo::addfvMeshConstructorToTable<Foa m::heRhoThermo<Foam::rhoThermo, Foam:ureMixture<Foam::constTransport<Foam::speci es::thermo<Foam::hConstThermo<Foam:erfectGas<Foa m::specie> >, Foam::sensibleEnthalpy> > > > >::New(Foam::fvMesh const&, Foam::word const&) at ??:?
#5 Foam::autoPtr<Foam::basicThermo> Foam::basicThermo::New<Foam::basicThermo>(Foam::fv Mesh const&, Foam::word const&) at ??:?
#6 Foam::basicThermo::New(Foam::fvMesh const&, Foam::word const&) at ??:?
#7
at ??:?
#8 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#9
at ??:?
Floating point exception (core dumped)

Help me please.
Thanks