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Saving solution (magnetostatics) to .vtk - extremely large files

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5 years 8 months ago #686 by creativeworker
Saving solution (magnetostatics) to .vtk - extremely large files was created by creativeworker
Hello,

i'd like to save my solution of the ngsolve calculation to a .vtk file to prepare some nice graphics with ParaView. The problem is a magnetostatic one and has about 600.000 elements.
The export is lasting forever and producing extremely large files. (way over 20 GB)

i use the following code:
Code:
# VTKOutput object vtk = VTKOutput(ma=mesh, coefs=[u], names = ["vectorfield"], filename="result", subdivision=3) # Exporting the results: vtk.Do()

Is there something wrong with the concept of exporting the solution?
Can i reduce the resolution of the numbers?

Many thanks in advance for your support!
With best regards
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5 years 8 months ago #688 by schruste
Replied by schruste on topic Saving solution (magnetostatics) to .vtk - extremely large files
Hi creativeworker,

The VTK-legacy format (what is used here) is really consuming a lot of disk space (we haven't implemented the VTK binary format which would spare a lot of space). Your example snippet is fine. However, you are using subdivision=3 which means that every tetrahedron is divided into 8³=512 tetrahedron only for the purpose of visualization. This makes sense for higher order polynomials representing solutions with large variations. However, if you are ok with a low resolution visualization, try subdivision=0 which should give you roughly a file size of around 40 MB.

Best,
Christoph
The following user(s) said Thank You: creativeworker, gcdiwan
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5 years 8 months ago #689 by creativeworker
Replied by creativeworker on topic Saving solution (magnetostatics) to .vtk - extremely large files
Thank you! This solved it for my purpose. I wasn't aware of the extreme effect of the subdivision parameter. FYI: The file has now 160MB.
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