[Thamali]

Dear swak4Foamers,
I am using a new thread for this,since I have put a question earlier in a wrong place.

I am using a Boundary condition to find out "Tempreature" of a patch.The value is a fixed value.
The gradient expression is used for calculation of temperature.
Earlier I had some problems in making expressions,but now they semms to be ok...
My groovyBC expression is as follows
[boundaryField{
interFace
{

type groovyBC;
#include "commonVariables"
gradientExpression "yGRAD" ;

fractionExpression "1";
value uniform 400;

}][/CODE]
commonVariables

[variables "sig=5.67e-8;emiss=0.9;Tenv=773;Yvolat=(YCOs+YCO2s+YH2s+YCH4s +YCxHyOzs);epsilon=0.5+0.5*((0.7207-Yvolat)+(0.1457-Ychar)+(0.0426-Yash));yGRAD=sig*emiss*(pow(Tenv,4)-pow(ts,4))/((1-epsilon)*mag(effectiveThermalConductivityS)*mag(Sf ()));";][/CODE]

Now,my solver is a steady state one and it stops at a certain point in Time=2,when try to calculate the following(according to me);

[volScalarField cp =((D*log(ts/AA)-E)+cpSstd)/2;][/CODE](only place which used "log")


The error is as follows

[Time = 2

#0 Foam::error:rintStack(Foam::Ostream&) at ??:?
#1 Foam::sigFpe::sigHandler(int) at ??:?
#2 in "/lib/x86_64-linux-gnu/libc.so.6"
#3 log in "/lib/x86_64-linux-gnu/libm.so.6"
#4 Foam::log(Foam::Field<double>&, Foam::UList<double> const&) at ??:?
#5
at ??:?
#6
at ??:?
#7 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#8
at ??:?
Floating point exception (core dumped)
]

My problem is in "log(ts/AA)" is not (-)ve or zero,so,what my problem can be....???

Please help.
Thanks.
Thamali