[Paraview] using integrate variables between two filters

[Sven Buijssen]

Hi Michael,

Your first question has been discussed before, e.g., here:
http://markmail.org/message/jon3wyz3ve2rzza5

Regarding your second question you're looking for the ParaView filter Resample
with Dataset. It takes two inputs which will be your coarse and refined grid.
See the filter's help for more details.

Sven


----- Original Message -----
From: Michael Rapson <rpsmic001 at gmail.com>
To: paraview at paraview.org
Sent: 12/09/09 12:41:12
Subject: [Paraview] using integrate variables between two filters
> Hi all,
> 
> I use Paraview to post process results from finite element simulations
> and find it very useful. There is however, one thing that seems
> feasible but I cannot find out how to do in Paraview and I would
> appreciate it if someone could tell me whether it is possible.
> 
> I write data from my simulation to file as .vtk with a number of
> variables at each mesh location (say x velocity, y velocity and
> pressure). In Paraview I can load the file, compute result =
> velocity_X - velocity_Y using the calculator and then integrate
> variables to get the integral of velocity_X - velocity_Y on the mesh.
> This is obviously not a very useful result in general, what I really
> want is to compute velocity_X_simulation_1 - velocity_X_simulation_2,
> where simulation 1 and 2 share the same mesh but some different
> parameters. I can use a similar method to the one described above as
> long as the data from both simulations is stored in the same .vtk
> file, but is it possible to load two .vtk files into a single
> pipeline, or to access data across pipelines for the integrate
> variables method?
> 
> An even more optimistic question, if the two simulations are run on
> meshes that exist on the same domain (i.e. region in space) but have a
> different set of nodes, say the mesh for simulation 2 is refined once
> more than the mesh from simulation 1, is it possible for Paraview to
> interpolate data from the less refined mesh to the more refined mesh
> in order to compute velocity_X_simulation_1 - velocity_X_simulation_2
> and integrate?
> 
> The first scenario seems technically feasible, if it has been offered
> in Paraview. Alternatively, are there specialized programs that can
> read two .vtk files and combine their variables into a single .vtk
> file? The second is more optimistic and couldn't be done without
> explicitly interpolating the results from one mesh to the other. I
> have found the Group Datasets filter, but this does not seem to quite
> do it (the data sets are marked (partial) once grouped and calculating
> differences fails).
> 
> Thank you for any ideas about how I could achieve this, and also
> confirming whether it can be done in Paraview or if I should make
> another plan will help me to move forward.
> 
> Regards,
> Michael
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