[aspect-devel] Handing nodes problem

[John Naliboff]

Hi Lev,

Additional questions: how often are you refining the mesh and what are the refinement criteria? If you are only refining based on composition (previous email), why not also refine based on velocity (or viscosity, strain-rate, etc)?

Cheers,
John

*************************************************
John Naliboff
Assistant Project Scientist, CIG
Earth & Planetary Sciences Dept., UC Davis



> On May 18, 2017, at 12:02 PM, Max Rudolph <maxwellr at gmail.com> wrote:
> 
> We have also been having odd non-convergence issues in 2D models with AMR and periodic boundary conditions. I can try to dig up a .prm file that produces errors with the current development version of aspect.
> 
> On Thu, May 18, 2017 at 11:24 AM, Lev Karatun <lev.karatun at gmail.com <mailto:lev.karatun at gmail.com>> wrote:
> Hi all,
> 
> Lately, several of my simulations crashed with a non-convergence error, and in almost every case there was a velocity anomaly somewhere on the boundary between different refinement levels (see attached screenshot). If I turn off AMR, the problem goes away. I'm using an Iterated Stokes solver, the tolerance is currently 1e-6. I tried lowering the CFL number to 0.1, but it didn't help. I was wondering if anyone had similar problems in the past, and what would be the common approach to deal with them? 
> 
> Thanks in advance!
> 
> Best regards,
> Lev Karatun.
> 
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