[GRAUPS]

Hey guys, I'm looking to calculate a mass weighted average over a faceZone for pressure using swak4foam. Specifically, this is the equation I'm trying to implement...

Capture.PNG

My question comes when trying to implement. Is it possible in swak4foam to divide a sum by a sum within one expression? Can I do two sums separately and divide them? So far I've only seen expressions that can do one accumulation, such as the one below for mass flow rate...

mass-in
    {
        type swakExpression;
        valueType faceZone;
        zoneName interior-inlet-1;
        expression "phi*flip()";
        accumulations (
            sum
        );
        verbose true;
	autoInterpolate	true;
    }

Also, (if possible) what is the syntax for getting the absolute value and dot product within a swakExpression? Thanks in advance!