[Paraview] find minimum on a slice using interpolated values

Thu May 3 10:51:10 EDT 2018

Unfortunately I am using polyhedral/ hexa mesh with higher order scheme, find the minimum on a mesh point is a good start.
But if someone know a programmable filter that, using VTK is able to find the minimum would be a lot useful.
The method would be very robust and not very sensitive to variations in the mesh that may undergo slight variations.
Do you have any ideas for how to use vtk and / or numpy for this purpose?

Best Regards,
Andrea

From: Cory Quammen [mailto:cory.quammen at kitware.com]
Sent: Thursday, May 03, 2018 16:17
To: Caffagni, Andrea
Cc: Mathieu Westphal; paraview at public.kitware.com
Subject: Re: [Paraview] find minimum on a slice using interpolated values

Andrea,

Are your mesh cells linear (and hence linear interpolation would be used)? If so, then the minimum will always be at a mesh point. If they are higher order elements, then indeed the minimum could be somewhere inside a cell. Others on the list may be able to tell you if there is a way to find this minimum point in VTK.

Best regards,
Cory

On Thu, May 3, 2018 at 4:13 AM Caffagni, Andrea <Andrea.Caffagni at ferrari.com<mailto:Andrea.Caffagni at ferrari.com>> wrote:
Thank you Mathieu for your suggestion,
But if I understand correctly with this method I’m able to find only the value on the mesh points.
Thus, if I change the mesh with finer or coarser elements the value and the location that I can find change.
I would like to avoid this behavior, for this reason I would get the minimum value using the interpolated value on the slice.
do you think it's possible to do it? can I manage this with a programmable filter (work from script without gui)?

Best Regards,
Andrea

From: Mathieu Westphal [mailto:mathieu.westphal at kitware.com<mailto:mathieu.westphal at kitware.com>]
Sent: Thursday, May 03, 2018 09:07
To: Caffagni, Andrea
Cc: paraview at public.kitware.com<mailto:paraview at public.kitware.com>
Subject: Re: [Paraview] find minimum on a slice using interpolated values

Hi Andrea,
If your are using ParaView, you can obtain this information quite easilly by showing your dataset in a Spreadsheet view and orderinng the data by "Pressure".

Best,

Mathieu Westphal

On Wed, May 2, 2018 at 8:57 PM, Caffagni, Andrea <Andrea.Caffagni at ferrari.com<mailto:Andrea.Caffagni at ferrari.com>> wrote:
Dear users,
I need to find the absolute minimum value on a slice of a certain scalar (like pressure).
I would get this point using the interpolation in order to avoid the ‘sensitivity’ to the mesh (in this way, theoretically, if I change the mesh the minimum should always remain at the same point).
For this point I would like to get the three-dimensional position and the value of the scalar in question (pressure and/or velocity), maybe I can use the numpy functions in a programmable filter?

https://docs.scipy.org/doc/numpy-1.14.0/reference/generated/numpy.amin.html

But I have not idea of how use the interpolation…

Thanks for the suggestions,
Andrea

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This message is intended only for the use of the addressee and may contain information that is privileged, confidential and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, or the employee or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is prohibited under the applicable data protection law. If you have received this e-mail by mistake, please notify us immediately by return e-mail and delete this e-mail and all attachments from your system.

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