I think the filter you want is append attributes.  The append attributes filter 
takes two datasets with the same topology and combines their fields into one 
dataset.  The group datasets builds an assembly of parts.  Thus, your group 
datasets filter (if I understand correctly) has two parts that are coincident 
with each other.

-Ken

From: Pablo Mosquera Michaelsen 
<[email protected]<mailto:[email protected]>>
Date: Mon, 12 Sep 2011 14:20:17 +0200
To: <[email protected]<mailto:[email protected]>>
Subject: [Paraview] Join two derived variables

Hello,

I´m new to Paraview and I am  trying to perform a rather simple task I used to 
do with Tecplot. I have the flow field of a flat plate and I want to compare 
the boundary layer of my simulation with the theoretical velocity profile of 
Blasius. For that, both the velocity tangetial to the plate and the distance 
normal to the plate have to be turn dimensionless. This is how I´ve tried to do 
it in Paraview:
I open the solution file with the Tecplot reader, I add two Calculator filters 
to derive the dimensionless variables, then I join the two results with the 
Group Datasets filter. At that point I can find the two dimensionless variables 
in the Object inspector when the GroupDatasets1 object is activated in the 
pipeline. The problem is that only one of the two new variables is displayed 
appropriately with "Display, Color by" or by applying the Plot Over Line filter.

Am I making some fundamental mistake?   How would you people do this?

Another funny thing is that for the Group Datasets object, I see in the 
Information tab that I now have twice as many points and cells. That´s not what 
I wanted and sounds pretty inefficient. I only want to create new variables for 
already existing cells.

Any help will be greatly appreciated.

Regards,

Pablo Mosquera
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