[FLASH-USERS] Checkboard of Magnetic Monopoles

[Mark L Richardson]

Hi Aaron,
  Are you able to overlay the grid so we can see how these features relate
to the blocksize?

Cheers,
  -Mark

On Thu, Apr 12, 2012 at 3:54 PM, Aaron Froese <
aaron.froese at generalfusion.com> wrote:

> I am using the USM MHD solver with flash3 and I noticed that I am getting
> very large magnetic monopoles appearing in my solution, of the same order
> as the magnetic fields.  The monopoles appear in a somewhat random
> checkboard-like pattern, which I believe has something to do with the
> block-structure of the mesh.  I have attached two plots which show the
> magnitude of divb and posted copies online in case the mailing list does
> not allow file attachments.
>
> Cylindrical Shell Compression 2D - abs(divb)
> http://oi40.tinypic.com/1zeihbp.jpg
>
> Spherical Shell Compression 3D - abs(divb)
> http://oi39.tinypic.com/34grldv.jpg
>
> The central circle where the checkboard pattern appears is the only volume
> that is magnetized.  I am using a static AMR mesh with a uniform resolution
> across the magnetized volume, and less refinement in the surrounding
> non-magnetized fluid.  Has anyone observed similar behaviour?  It is
> definitely numerical in nature, but I do not know what part of the code is
> responsible.
>
> Thanks,
> Aaron




-- 
Mark Richardson,
Mark.L.Richardson at asu.edu
Ph.D. Candidate: Astrophysics
PSF 271
School of Earth and Space Exploration
Arizona State University
480 318-4449
www.public.asu.edu/~mlricha4
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