[mesa-users] Removing Mass Convergence Issue ("fix v_center to hit piston_Rmin exactly")

Robert Farmer rjfarmer at asu.edu
Thu May 26 23:32:20 EDT 2016


To clarify when you say remove remove mass from the "bottom of the modeled
outer", do you mean envelope or core? Remember that MESA models a NS by
setting an inner boundary condition (at some M,R and L and the for the test
case will be 1.4Msun, 10km and some L) and puts material on top as the
envelope of the NS and only evolves that. So are you trying to change the
inner boundary condition or do something to the envelope?

Inlists are also helpful when trying to describe a problem.


On Thu, May 26, 2016 at 7:38 PM, Ryan Mckinven <ryan.mckinven at mail.mcgill.ca
> wrote:

> Hi mesa-users,
> Operating system: Mac OS X El Capitan
> Mesa version Number: 8118
> I'm studying unstable carbon burning on an accreting neutron star using a
> modified version of the 'ns_c' test suite. I would like to modify mesa to
> remove mass from the bottom of the modelled outer. To this end, I've tried
> using the star_job control 'remove_initial_center_at_cell_k' to establish a
> threshold beyond which mass will be removed but I'm getting a convergence
> error,
> "fix v_center to hit piston_Rmin exactly
> stopping because of convergence problems dt < min_timestep_limit"
> I've tried increasing 'min_timestep_limit' but get the same error. I was
> wondering if you have any advice on how to tackle this issue.
> P.s. I should note that I have used alternative methods of removing mass
> from the bottom of the modelled envelope using controls like
> 'removing_center_by_mass_Msun' to no avail.
> Best Regards,
> Ryan Mckinven
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