an error in Calculator's equation
 

I have written this equation for averaging on p:
but there shown an error:

Looks like you are trying some funkyDoCalc kind of expression in ParaView, that won't work.

Hi Bernhard
what do you mean by "trying some funkyDoCalc kind"?
then can't do averaging in paraView?

I am not sure whether or not "area()" is correct notation in the ParaView calculator, I think it is not. I do recognize the notation from the funkyDoCalc utility (by Gschaider)

is there a way to contribute area or volume of cells in the formulas in paraview?

Greetings to all!

@Ehsan:
:confused: I've written about this in the past and reminded you at least once... so this makes it the second time I'll have to remind you:

As for the area calculation, you'll have to first use the filter "Integrate Variables", which will calculate the area.

Best regards,
Bruno

Hi Bruno
yes I grasped that problem,I just put here the full error message.
could you clarify a bit about the filter?
thanks.

Dear Ehsan
take the following steps:

1> first define the slice that you want to calculate its area or averaging data on it and click apply.
2> on the filters menu,select the last item i.e. Alphabetics and click on "Integrate Variables" and apply.
3> be sure to select attribute mode: cell data
4>you can see the area of the selected slice and the integral of any variable (e.g P in your case) on this plane. (i.e sum(p*area())). so in order to find the average P; just divide this value by the area.
5>You can also use calculator for this purpose;again on the filters menu,select the last item i.e. Alphabetic and click on calculator. be sure that is on: attribute mode: cell data and define the new variable Pbar by using the values that is on the scalar section.
you can see the new Pbar value on this plane now!
I hope that was useful!:):)

Hi Mohsen
thanks,
I did the way you told in number 5,but it doesn't know area yet:
I did it by using 1-4 steps nad it was fine,thanks,but step 5 is a bit unclear to me.

Hi
how can I define two fields with calculator?
when I define second field it replaces to previous one!

Dear Ehsan
Probably they have the same name.
choose a different name for your 2nd field
there shouldn't be any problem with defining more than 2 fields with calculator

I was using one calculator branch only!it resolved,thanks for consideration.

Nusslet calculation in openfoam
 

Hi all

I want to calculate the Nusslet number in ParaView. When I calculate the inner product to normals and grad(T), it gives me this error:

Do you know how to solve it?

Also, it seems that wallHeatFlux does not work in my solver: rheoHeatFoam.

Thank you!