[Paraview] Gradient between cell data

[Moreland, Kenneth]

Christoph,

To my knowledge, there is no direct way to do this. If your data are in an ImageData or some other type of structured grid, it should be fairly straightforward to use a programmable filter to build a new grid with one fewer point in each dimension and then copy the cell data of this original mesh to the point data of the new mesh. You can then do finite differences on the points of the new mesh and get the result you are looking for.

-Ken

-----Original Message-----
From: ParaView [mailto:paraview-bounces at paraview.org] On Behalf Of Christoph Grüninger
Sent: Thursday, January 26, 2017 6:09 AM
To: paraview at paraview.org
Subject: [EXTERNAL] [Paraview] Gradient between cell data

Dear ParaView!

I have a simulation computed with a finite volume method which outputs pressure as cell data. The pressure gradient is related to the velocity (Darcy's law). Is it possible to calculate the gradient as a finite difference between the cell centers of adjacent cells?
The result would be located between the cells, not sure whether this works at all.

Converting cell data to point data and using the gradient filter is not what I want.

Bye
Christoph
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