[Mesa-users] Seeking help with an convergence problem in double_bh test suite

[Ruggero Valli]

Hi Levi,

In your conditions (and under the used assumptions) it is expected that 
the accretor would quickly reach critical rotation and then stay like 
that for most of the mass transfer phase, only accreting very little 
mass. However it is not normal for this to cause the model to stop. Can 
you attach the last part of your terminal output, from the last 
successful step to the point of termination?

Best,

Ruggero

PS: It is probably unrelated to your problem, but since you have enabled 
tidal circularization, you may want to enable also

> do_jdot_ml = .true.     ! angular momentum carried away by winds,
>                          ! and by alpha, beta and delta fractions of mtransfer rate
> do_jdot_ls = .true.     ! angular momentum trasferred to/from the spin of the stars
These insure that when you give/take away rotational angular momentum 
from a star due to tides or winds, this is reflected in an appropriate 
gain/loss of angular momentum from the orbit.

On 7/16/23 14:45, Levi via Mesa-users wrote:
>
> Hello all,
>
>  I am currently working on creating a grid of massive binaries, and I 
> have encountered some difficulties during the runtime. In particular, 
> after mass transfer begins, M2 consistently reaches critical rotation 
> due to excessive accretion of angular momentum. And it unable to 
> effectively remove sufficient angular momentum, causing the model to 
> cease evolving.
>
> I have already attempted to address the issue by adjusting the 
> “implicit_mdot_boost” and “mdot_revise_factor” parameters to increase 
> mass and angular momentum loss. Regrettably, these modifications have 
> not had the desired effect.
>
> I have attached the model in the attachment, which can running by the 
> latest version of MESA-r23.05.1. Additionally, I have saved the 
> terminal output information in the “rn.out” file.
>
> I would greatly appreciate any guidance, suggestions, or solutions you 
> can provide.
>
> Best regards,
>
> Levi
>
>
>
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