[aspect-devel] Open boundaries + tracers

Lev Karatun lev.karatun at gmail.com
Mon Nov 28 18:22:48 PST 2016

Hi Rene,

thanks a lot, I actually had the load balancing strategy set to
"repartition", changing it to "remove and add particles" solved the
problem. The manual only lists the possible choices, but doesn't explain
what they do, so I originally went with the default option.
Could you get into some more detail on the strategies, please? Do I
understand it correctly that the option "add particles" enforces the
minimum number of particles in the cell, generating them whenever needed?
What would be the difference between "set Load balancing strategy = add
particles, remove particles" and ""set Load balancing strategy = add
tracers, remove tracers"? And how will the "repartition" strategy work
together with the other listed algorithms? Speaking about the webinar on
particles, does "repartition" correspond to the "balanced repartitioning",
and the rest (except for none) - "particle management"? And for the
"Variable distribution" strategy (mentioned in the webinar), what option do
I have to choose to enable the mesh adjustment according to particles (and
how will it work together with the regular mesh refinement strategy?) ?

Best regards,
Lev Karatun.

2016-11-25 17:43 GMT-05:00 Rene Gassmoeller <rene.gassmoeller at mailbox.org>:

> Hi Lev,
> Let me cc this to the mailing list so that others hear about problems and
> solutions as well.
> Cool model! From what you describe it seems you are doing everything right
> so far. What is the value for the 'Load balancing strategy' in the
> Particles subsection? In order for the 'Minimum tracers per cell' option to
> have an effect you need to at least select the option 'add tracers'
> (possibly combine it with others like "set Load balancing strategy = add
> tracers, remove tracers, repartition"). This should then generate new
> tracers when many others have left that cell. However keep in mind that the
> properties of these new particles will be interpolated from the remaining
> existing particles in that cell. This might or might not be a problem for
> your model.
> Let me know about the parameter file option,
> Best,
> Rene
> On 11/24/2016 10:36 PM, Lev Karatun wrote:
> Hi Rene,
> I recently added tracers to my models, they work great, thank you for
> adding them! I was trying to incorporate open boundaries (by Anne Glerum)
> into my models, they work just fine too. However, when I included both of
> them, I ran into a problem: the cells near the open boundary, through
> which constant inflow of material is happening end up not having enough
> tracers (and later not  having any tracers at all) (see attached
> screenshot). I decreased the CFL number from 0.5 to 0.1, but it didn't
> help. So I was wondering if you could tell me what the possible causes are?
> It happens both with and without adaptive refinement, and I have min
> tracers number set to 10.
> Thanks in advance!
> Best regards,
> Lev Karatun.
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