[B_R_Khan]

HI!

I want to use temperature value of a specific mesh point from previous time step in a boundary condition. I have used cloud set in controlDict functions to get temperature at specific mesh point; however when I'm trying to use this data in defining boundary condition via swak4foam, I'm getting error that the set is not found in table. Valid entries: 0()

I'm using this piece of code in groovyBC to get sampled set data:

ceiling 
{	type groovyBC; 
	value	uniform 300; 
	variables ( 
		"Tpoint{set'sensor}=average(T);" 
		); 
	gradientExpression "mag((Tpoint-oldTime(Tpoint))/deltaT())";
}

I have added the following function for cloud set in controlDict:

sensor 
{
type            sets;
libs            (sampling);
writeControl timeStep; 
writeInterval 1;
interpolationScheme cellPointFace;
setFormat       raw;
fields          ( T );

sets
(
    sensor
    {
	type cloud; 
	axis xyz; 
	points ( 
		(0 0.5 0.5) 
		); 
    }
 
);
}

What am I missing? please guide

Thanks