[Mesa-users] The problem of Laminar Flame Speeds in Degenerate Oxygen–Neon Mixtures

Mon Nov 8 16:19:38 UTC 2021

hi liguo,

yes, cells = zones, as shown in the profile files, terminal, etc.

mesa has many controls for changing/adapting the mass resolution (i.e., the number of cells)

https://docs.mesastar.org/en/latest/reference/controls.html#mesh-adjustment

some of the more convenient ones are described in

https://docs.mesastar.org/en/latest/using_mesa/best_practices.html#explore-numerical-convergence

fxt

> On Nov 8, 2021, at 6:28 AM, Liguo <liguo070923 at 163.com> wrote:
> 
> Dear Francis
> I want to test as you suggest as follow,but I meet a problem.
> >the c13_pocket test suite case will run with the 495 isotope network only if the number of cells 
> >in the model is significantly reduced, or (as rob mentioned) by using a smaller reaction network 
> >while keeping the same number of cells.
> 
> What is the number of cells?Is it number of zone as  show in profile files?
> I set 'max_num_profile_zones ' =100 or smaller  number in inlist files.But It didn't change anything.
> How can I change number of cells？
> Looking forward your reply！
> sincerely！
> Liguo
> 
> 
> 
> 
> 
> 
> At 2021-10-20 10:41:43, "Francis Timmes" <fxt44 at mac.com> wrote:
> >> So I think that it will run successfully in star/test_suit/c13_pocket.
> >
> >
> >
> >currently, mesa has an maximum limit on the addressable space. 
> >a model's addressable space is combination of the size of the reaction network 
> >and the number of cells in a model. if a model's addressable space exceeds 
> >the maximum, then invalid memory access messages are emitted and the model terminates.
> >
> >the number of cells in the conductive_flame test suite case is much smaller than 
> >than the number of cells in the c13_pocket test case. hence the conductive_flame
> >test suite case runs with a 495 isotope network while the c13_pocket test suite case will not. 
> >the c13_pocket test suite case will run with the 495 isotope network only if the number of cells 
> >in the model is significantly reduced, or (as rob mentioned) by using a smaller reaction network 
> >while keeping the same number of cells.
> >
> >if one is interested in, say, the s-process in a c13 pocket during the thermal pulse
> >phase of evolution, one is better off extracting the mesa's temperature, density, and composition
> >profiles (from a smaller reaction network) during a thermal pulse and feeding those profiles 
> >to a standalone, suitably neutron-rich, reaction network with thousands of isotopes.
> >
> >fxt
> >
> >
> >
> >
> >
> >
> >
> >> On Oct 19, 2021, at 6:49 PM, Liguo via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> >> 
> >> Dear Rob
> >> Thank you for your reply!
> >> I also realize that this error means nuclear networks are too large .But in star/test_suit/conductive_flame,it can run with mesa_495.net.So I think that it will run successfully in star/test_suit/c13_pocket.Should I add other sentences in inlist file to run it successfully?
> >> 
> >> Sincerely!
> >> Liguo
> >> 
> >> 
> >> 
> >> 
> >> 在 2021-10-19 17:42:19，"Rob Farmer" <robert.j.farmer37 at gmail.com> 写道：
> >> 
> >> Hi,
> >> 
> >> > Program received signal SIGSEGV: Segmentation fault - invalid memory reference.
> >> 
> >> This is a fundamental problem with MESA that happens when running very large nuclear networks. The only solution is to run with a smaller nuclear network.
> >> 
> >> Rob
> >> 
> >> 
> >> On Tue, 19 Oct 2021 at 03:50, Liguo <liguo070923 at 163.com> wrote:
> >> 
> >> 
> >> 
> >> Dear professors
> >> I taped  a word wrong in last email.Both in conductive_flame and c13_pocket,I wrote 'change_net=.true. new_net_name ='mesa_495.net' '.
> >> 
> >> Sincerely！
> >> Liguo
> >> At 2021-10-18 17:22:19, "Rob Farmer" <robert.j.farmer37 at gmail.com> wrote:
> >> Hi
> >> Changing the net to have 3335 isotopes is unlikely to run, MESA will almost certainly crash given the huge number of isotopes in that net. 
> >> 
> >> Given you seem to have problems running the 495 net, I would suggest trying to get that working first before trying to go any bigger.
> >> 
> >> Repeating Aaron's question, What does "can't run successfully" mean? Are there any error messages? Do the results not look like what you expect, if so what do they look like and what do you expect?
> >> 
> >> Rob
> >> 
> >> On Mon, 18 Oct 2021 at 09:41, Liguo via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> >> Dear Timmes
> >> Thank you very much for your reply and the reference you provided me!
> >> If I change net in star job  to big net such as mesa_3335.net,whether should I add other sentences into inlist to run 'conductive_flame' successfully in star/test_suit?
> >> 
> >> Sincerely!
> >> Liguo
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> At 2021-10-18 11:29:43, "Francis Timmes" <fxt44 at mac.com> wrote: >hi liguo, > >i encourage looking at > >https://docs.mesastar.org/en/latest/test_suite/conductive_flame.html#conductive-flame > >and the schwab et al 2020 article mentioned > >https://ui.adsabs.harvard.edu/abs/2020ApJ...891....5S/abstract > >and the zenodo repository of the effort > >https://doi.org/10.5281/zenodo.3537874 > >fxt > > > > > > >> On Oct 17, 2021, at 5:58 PM, Aaron Dotter <aaron.dotter at gmail.com> wrote: >> >> Hi Liguo, >> >> You'll need to be (much) more specific in order for anyone to help you. When you try to run it with mesa_495.net, what happens? What does "can't run successfully" mean? >> >> Thanks, >> Aaron >> >> On Sun, Oct 17, 2021 at 8:23 PM Liguo via Mesa-users <mesa-users at lists.mesastar.org> wrote: >> Dear Francis Timmes >> I am using mesa-r15140.I want to reproduce your mesa work which is named conductive_flame in mesa/star/test_suit.But I have found that mesa can't run successfully when I use big net mesa_495.net. >> Could you please help me analyze the problem? >> Sincerely! >> Liguo >> >> >> >> _______________________________________________ >> mesa-users at lists.mesastar.org >> https://lists.mesastar.org/mailman/listinfo/mesa-users >> 
> >> 
> >> 
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