[Mesa-users] compounding offset error with MESA and .gyre output
wdarnett at gmail.com
Thu Feb 28 19:08:31 EST 2019
In order for linear analysis to be valid (gyre), the time step for a full
hydro model must be small enough. I would look for time scales for
nonstatic processes which might muddle the linear analysis.
are there any which are the same order as your time between models? Just a
suggestion; sometimes dynamics rears its (lovely) complex head ;-)
On Wed, Feb 27, 2019 at 11:18 PM Meridith Joyce via Mesa-users <
mesa-users at lists.mesastar.org> wrote:
> Hi All,
> Bit of an oddly specific question here:
> I'm stopping and starting MESA on very short time intervals (on the order
> of half a year, in some cases) and generating GYRE profiles at each of
> those times.
> Proceeding chronologically, for the first 5 or so such .gyre models out of
> a set of, say, 20, the stellar radius at the appropriate value of t in
> MESA's history file, say R(t), is in near exact agreement with the radius
> passed to the .gyre file.
> With increasing evolutionary time, however, an offset between R(t) in the
> history file and the radius given to .gyre (say R_gyre) emerges. The
> discrepancy between R(t) and R_gyre worsens the more .gyre models I try to
> produce from a single run of ./star.
> All of the .gyre files in a set are generated from a single evolutionary
> run---though that run may proceed discontinuously---using the same inlist
> and controls. I've attached one of my inlists for example.
> My instinct is that this is due to some quirk or error which iteratively
> compounds a loss of precision or numerical misalignment each time I stop
> and restart the models. The attached figures perhaps demonstrate my problem
> more clearly.
> Has anyone encountered this before or know a way around it?
> Thank you,
> Dr. Meridith Joyce
> PhD, Dartmouth College & SAAO
> RSAA Postdoctoral Fellow
> Australian National University
> mesa-users at lists.mesastar.org
University of Arizona
Facts are stubborn, but statistics are more pliable. Mark Twain
Facts do not cease to exist because they are ignored. Aldous Huxley
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Mesa-users