[mesa-users] Mesa sound speeds

[Farag, Ebraheem Khaled]

apologies i didn't attach it. it's just a screenshot
________________________________
From: Robert FARMER [rjfarmer at asu.edu]
Sent: Thursday, July 30, 2015 3:51 PM
To: Farag, Ebraheem Khaled
Cc: mesa-users at lists.sourceforge.net
Subject: Re: [mesa-users] Mesa sound speeds

Hi
What version of MESA are you using?

What values are you getting and what values do you expect to get for the csound (plots are helpful here)? Have you checked the units are the same? Can you show a plot of what you think is diverging and what you expect the data to show?

Rob

On Thu, Jul 30, 2015 at 2:42 PM, Farag, Ebraheem Khaled <farag.11 at lanl.gov<mailto:farag.11 at lanl.gov>> wrote:
Hello, I'm running the mesa example_solar_model in the test_suite file and my sound speed plots are more than an order of magnitude greater than the data I have from AGS09. Is there something specific I'm doing wrong? o haven't changed anything, but the data looks completely divergent in the csound department. This doesn't seem correct because the mesa power point files indicate they closely match the sun helioseismology inferences, yet I'm not seeing that data when i run the simulation. could someone help. the model runs diverges regardless of opacities. I've change them to check and they just diverge in the same manner. especially at r>0.5.

thanks,
Ebraheem
________________________________
From: Ken Shen [kenshen at astro.berkeley.edu<mailto:kenshen at astro.berkeley.edu>]
Sent: Thursday, July 30, 2015 12:21 PM
To: Josiah Schwab
Cc: mesa-users at lists.sourceforge.net<mailto:mesa-users at lists.sourceforge.net>
Subject: Re: [mesa-users] Trouble relaxing composition

That worked perfectly, thanks!

On Thu, Jul 30, 2015 at 12:37 AM, Josiah Schwab <jwschwab at berkeley.edu<mailto:jwschwab at berkeley.edu>> wrote:
Hi Ken,

> The issue is that the run relaxes to a composition that is not what I've
> specified.  In particular, the inner 98% or so should be nearly pure 4He,
> but instead relaxes to exactly 50/50 4He/28Si.  Similar issues occur with
> other compositions I've tried; in one of them, the inner region relaxed to
> exactly 1/3 each of C/O/Si instead of 50/50 C/O.  Any insight out there?

Pretty sure that your composition file is backwards.  That is, the first
column (xq) should be monotonically increasing.

If I reverse the lines (i.e., select region, M-x reverse-region), I get
the the attached abundance profile.

Josiah

P.S.  Also, you should probably have a point at xq = 1.0.



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