[Mesa-users] network mismatch

[Francis Timmes]

how mesa addresses changes to a reaction network
are described in mesa III, section 6.2.2, paxton et al 2015:

MESA follows rules for mapping isotopes from one network to another network: if an isotope present in the old network is also present in the new network, then the abundance from the old network is copied to the abundance for the new network. Isotopes in the new network that are not present in the old network are initially given a mass fraction of zero. MESA then separately renormalizes classes of isotopes to have the same total mass fraction in the new network as in the old network. The classes are neutrons, hydrogen, helium, carbon, nitrogen, oxygen, and other metals. This procedure guarantees that the sum of the mass fractions in a given class will be the same in the new network as in the old network.

does this help?

fxt




> On Aug 13, 2018, at 10:37 AM, amber lauer via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> 
> Just to follow up, in case someone saw my question, it is possible to search the mailing list archives here:
> 
> https://lists.mesastar.org/pipermail/mesa-users/
> 
> I last inquired about this capability at the 2017 summer school, which was right around the time of the changover to the new mail server. I believe that capability hadn't been added yet. Thanks.
> 
> On Tue, Jul 24, 2018 at 3:31 PM amber lauer <amberlauer at gmail.com> wrote:
> Hello guys, part of this question has been asked previously (by me) but I believe it was during the previous mailing list and I'm not sure how to search those archives. 
> 
> I'm writing to ask about mismatch between isotopes included in a model vs the chosen network. I know that in one of the two cases they are reassigned to solar. How about the other?
> 
> What I mean is, if a model includes more isotopes than the net, what happens to the abundances of those that are removed from the model? If a net includes more isotopes than the model, how are the missing isotopes assigned (if at all)? I looked at adjust_net.f90 and adjust_xyz.f90, but I don't think these are exactly the cases I'm looking for. Thanks as always.
> 
> -- 
> Amber Lauer
> Postdoctoral Researcher
> Triangle Universities Nuclear Lab
> Duke University
> amber.lauer at tunl.duke.edu
> 
> 
> -- 
> Amber Lauer
> Postdoctoral Researcher
> Triangle Universities Nuclear Lab
> Duke University
> amber.lauer at tunl.duke.edu
> _______________________________________________
> mesa-users at lists.mesastar.org
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>