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

[Ryan Mckinven]

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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