[Nek5000-users] Mass flow rate and averages

[nek5000-users at lists.mcs.anl.gov]

Hi neks, 
maybe mine, will be noob questions, but i am a nek noob. 
I am running a DNS of channel with riblets, now i  need to know the 
averages fields and the mass flow rate. 
For the averages fields i have seen in turbChannel example folder, and i 
have seen in turbchannel.usr that there is a subroutine that do it. 
But i didn't understand, if i set fintime(P10) and iotime(P14) and P68 
in rea file, have i always the output?Because in turbchannel example, if 
i set how i already told, i have errors in compilation. 
And the second question is related to the mass flow rate. 
If i set forcing, can i know the relative mass flow rate? Or viceversa, 
if i set the mass flow rate in .rea file, can i know the forcing? Where 
can i read or compute it?