[arsalan.dryi]

Dear Foamers,

How could I use the calculated swak expressions at other functions for example like below:

    createInterface
    {
        type createSampledSurface;
        outputControl timeStep;
        outputInterval 1;
        surfaceName interface;
        surface {
            type isoSurface;
            isoField alpha.water;
            isoValue 0.5;
            interpolate true;
      		 }
    }

 surface
    {
	ignore_unimplemented_simpleFunctionObject::movePoints true;
        type swakExpression;
        valueType surface;
        surfaceName interface;
        verbose true;
        expression "sum(area())";
        accumulations (
            min
                   );
	autowrite true;
    }

    k
    {
	aliases {
 		alphawater alpha.water;
		}
	ignore_unimplemented_simpleFunctionObject::movePoints true;
        type swakExpression;
        valueType internalField;
	variables (
	"thres=0.5;"//which cells to keep
	"VolC= sum (alphawater < thres ? C*vol() : 0);"
	);        
	expression "VolC/surface";
        accumulations (
		average		
        );
    }

Here I want to use calculated area() from surface function in the k function, what kind of method should be implemented in this situation?
Moreover, we couldn't calculate area() in the k function separately because this function has an internalField valueType while using area() needs a surface valueType!

The second question is how could we use the runTime() value in the functions? I think it has a keyword but I don't remember that.

Any help and comment will be appreciated.
Regards,
Arsalan.