[Mesa-users] Planet Radius and EOS question (Isaac Malsky)

[Bill Paxton]

> On May 11, 2020, at 8:29 AM, Isaac Malsky <isaacmalsky at gmail.com> wrote:
> 
> Hi Dr. Kubyshinka and Dr. Paxton,
> 
> Thanks so much for the advice, this is incredibly helpful!
> 
> Is there an equivalent eos control for the the newest version of MESA? I'm running 12778, and I only see the use_eosDT2 = .false. control for earlier versions like 10398. The radius dip definitely does seem to be because of some eos issues when I'm pushing the most extreme models.

Glad to hear that you are running the current release.  That means that we can’t just put the blame on eosDT2 since it has gone away.  But there are still plenty of ways to get in trouble!   I’ve been swamped with other projects so I was hoping someone else would jump in to help you.  But let me take a quick look to see if I can find something.  I’ll get back to you.

-b


> 
> Best,
> Isaac
> 
> On Mon, May 11, 2020 at 11:23 AM Bill Paxton <paxton at kitp.ucsb.edu <mailto:paxton at kitp.ucsb.edu>> wrote:
> 
>> On May 11, 2020, at 3:58 AM, Daria Kubyshkina via Mesa-users <mesa-users at lists.mesastar.org <mailto:mesa-users at lists.mesastar.org>> wrote:
>> 
>> The problem disappears if setting use_eosDT2 = .false. In controls.defaults it is actually stated that this option does not apply if lnPgas_flag is true, but it seems to be wrong. With the use_eosDT2 flag being false, the radii behave as in older versions of MESA.
>> 
> 
> Thanks for the excellent advice.  Concerning the strange need to turn off DT2 even when lnPgas_flag is true - it was a surprise to me too!   Turns out in certain situations the system decides to bail out of the lnPgas tables to search for an answer using the non-lnPgas eos.  And those are the cases that cause the problems since they seems to fail with DT2 but are ok without it.
> 
> You might try the current public release of mesa (12778).  You should be pleased to find that DT2 has gone away (and will not be coming back!). 
> 
> -B
> 
> 
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