Problem in step-44, 2d simulations

[navneet roshan]

Dear dealii members, 

While running step-44, 2d simulations I stumbled upon the mismatch in the vertices of the quadrilaterals in the deformed mesh(please find the attached image), I am curious if it's an artifact in visualization? How to overcome this problem?

Thank you

Regards, 

Navneet

 

   

[Wolfgang Bangerth]

> While running step-44, 2d simulations I stumbled upon the mismatch in the
> vertices of the quadrilaterals in the deformed mesh(please find the attached
> image), I am curious if it's an artifact in visualization? How to overcome

Navneet
the default in step-44 is to use quadratic elements, and the call to
DataOut::build_patches() then outputs each cell as a collection of 2x2
quadrilaterals. In cases such as this, you get artifacts like the ones
described here:
https://github.com/dealii/dealii/wiki/Frequently-Asked-Questions#in-my-graphical-output-the-solution-appears-discontinuous-at-hanging-nodes

So yes, what you are seeing your output is an artifact of visualization. These
artifacts become smaller if you refine the mesh more often.

Best
W.


--
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Wolfgang Bangerth email: bang...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/