[Zinedine]

Dear foamers,

Maybe my query might sound obvious, but afrer many attempts I
could not resolve the following:

Let's say you are simulating a cylinder-like fluid flow systems.
You have periodic inlet flow velocity BC and you wish to time
average at certain times.
To be more specific let say that inlet velocity is:
V(t)=Asin(2pi.freq.time).

Now I wish to time average at times where:

1. V(t) = 0 at upstroke
2. V(t) = 0 at down-stroke
2. V(t) = A
4. V(t) = -A

Assume that V(t) = 0 at upstroke at t=0, 1, 2, .... etc ...
V(t) = 0 at downtroke at t=0.5, 1.5, 2.5, .. etc ..
V(T) = A at t= 0.25, 1.25, 2.25, etc
V(T) = -A at t = 0.75, 1.75, 2.75, etc.

using the fieldAverage utility.

I would like time average a times:
1. t=0,1,2,3,4, etc..
2. t= 0.5,1.5,2.5, etc.
3. t= 0.25,1.25,2.25, etc. and
4. t= 0.75, 1.75, 2.75 etc..

This means I need to setup fieldAverage utility in controlDict
four times to achieve the aforementioned, however I am completely
lost in translation !

Your help is greatly appreciated.

Cheers



Z.