Adaptive Mesh Refinement in 3D

Hello Christopher,

Thank you for your assistance.
Do I need to Install the latest release or the nightly build release to get these changes?.

Regards,

Ahmed

Hi,
currently it is only in the nightly release, but we plan to release 1909 this weak.
Best
Christopher

Hello Christopher,

The latest nightly build doesn't work on my macOS (10.12.6). Actually any release from September 3 and older works fine, but the latest ones (September 4 and later) do not work.


Best,

Ahmed

Hello,

I was trying to do something very similar here. I would like to solve an electrostatic problem in 3D and use the adaptive refinement method to improve the result accuracy.

In practice I want to do the following.
I build a 3D geometry composed of a prism which contains come charge density surrounded by a "vacuum" domain enclosed in a far external surface (a sphere).
I than try to solve the BVP of the related Poisson problem with the adaptive refinement algorithm as in the example in section 1.6 (Error estimation & adaptive refinement).
I also added the lines of code suggested by Christopher to remove the refinement flags for surface elements.

As a result, i find a strange behavior of the error estimator. Indeed, with increasing mesh density the
error estimate tends to zero, but not with a monotonic manner (as in the tutorial example).
I have the feeling there is something wrong going on, but I can't say if it's a problem of my code or something related to the 3D refinement as faced by Ahmed.

I'm attaching the code.
Thanks in advance for the help.

Tommaso

Hi Tomasso,

have a look at your solution ... and think about your boundary conditions

J

Hi Joachim,

My bad. It was a stupid mistake. Thanks for pointing that out.

Best,
Tommaso