[immortality]

I've found this function in an thesis.is it correct?
because it has defined an average of total pressure on the patch at each time step and in accumulations it uses average again.what does average do in this case?is it a correct method to get average on a patch?

Total-pressuresec9outlet
{
functionObjectLibs("libsimpleSwakFunctionObjects.so”);
type swak Expression ;
outputControl outputTime ;
valueType faceZone ;
zoneName sec9 outlet ;
expression ”sum((0.5∗rho*pow(mag(U),2)+p)∗(area()∗rho))/(sum(area()∗rho))”;
accumulations
(
average
);
verbose true ;
autoInterpolate true ;
warnAutoInterpolate false ;
}