Yade

Invisible data point in paraview

Asked by Yimsk

Hi, I have some problems to visualize the VTK file of DEM simulation data.

The data point from the VTK file was not detected correctly in the paraview.
However, it can be visualized using the FreeCad software.

I don't know the exact reason, but this problem sometimes happened when the multi-sphere simulation cost becomes large.

For saving the VTK file, i use the following sentence:

 VTKRecorder(fileName='3d-vtk-',recorders=['all'],iterPeriod=50000),
 qt.SnapshotEngine(fileBase='3d-',iterPeriod=100000,label='snapshot'),

I attached a link for downloading the VTK file, please kindly check it:
https://drive.google.com/file/d/1D14LlAkuo0DG6K_Ys_YvFjILaRcXsukM/view?usp=sharing

Please give some feedback about this problem.

Thank you for your consideration.

Best regards,

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Jan Stránský (honzik) said : 		#1

Hello,

> I have some problems to visualize the VTK file of DEM simulation data.
> The data point from the VTK file was not detected correctly in the paraview.

please read [1] and:

Be (much) more specific.
- what are "some problems"?
- what does "not detected correctly" mean?
- what is "the data point"?
- ...

Specify, what version of Paraview you use.

Describe at least roughly your simulation:
- is it periodic or not?
- do you have spheres only, or also other shapes?
- what are typical dimensions?
- ... ?

If I open your file, I see two "dots".
If I click "+" next to "Layout #1", Create New -> SpreadSheet View, I see that almost all your points have coordinates around unity, radius << 1.
BUT
If I click on "Points" to order the sheet by coordinates, I see that a few particles have coordinates in order of 1e8.
Together with radius << 1 and other particles very close to (0,0,0), it seems suspicious.
could this be the reason of the problems?

Cheers
Jan

[1] https://www.yade-dem.org/wiki/Howtoask

Revision history for this message
Yimsk (sky-132) said : 		#2

Dear. Jan

Thank you for your kind answer.

Description of this DEM simulation is:

1. The random sphere pack was generated
2. Some particle was replaced to clump particle
3. Replaced clump pack was deposited on the base plate through the hole by gravitational force (hall-flow test)

In this simulation, the visualized point data from the recorded VTK file was visible up to time step 2 in the Paraview, while it was suddenly disappeared in time step 3.
Based on your suggestion, I revised some clump particle information, and this problem was solved.
I suspected that invisible point data in ParaView could be due to heavy clump particles consisted many spheres particles.

Thank you for your kind answer again.

Best regards,

Yim