[mesa-users] accretion_powered_irradiation

[Bill Wolf]

Hi Chen,

Full inlists and model files would be helpful for us to reproduce this error.

My guess, though, is that you’re having periodic retries and/or backups. Often I’ll have a series of steps where the tilmestep is increasing as much as it can (max_increase) and then once it has gotten to some critical timestep size, the hydro solver struggles to converge and forces a retry, bringing the timesteps back down.

If this is a case, I have no simple solution for you, but you might try to use the hydro debugging tools to see what the physical situation is that is causing problems. See my guide over here: http://wmwolf.github.io/projects/mesa_debugging/ for an example of how to do this.

Bill Wolf

________________________ 
William Wolf 
wmwolf at physics.ucsb.edu 

UCSB Department of Physics 

On June 10, 2016 at 9:59:52 AM, Chen WC (chenwc at pku.edu.cn) wrote:

Dear All,
I use the “binary_donor_only_implicit_mdot” to calculate the evolution of an intermediate-mass X-ray binary including a 1.4 Msun NS and a 3.0 Msun donor star (with a solar composition),
and the initial orbital period is 1.0 day.

In calculation, I consider the irradiation process by X-ray luminosity of the NS. In the list_project:
****
accretion_powered_irradiation = .true.
col_depth_for_eps_extra = 100.0 ! g/cm^2
****
Other input parameters such as accretor_radius_for_irrd, max_F_irr were adopted to be default.


However, after the mass of the donor star decrease to be ~ 2.3-2.4 Msun, the calculation is very difficult to continue.
The timestep decrease to be <0.1 yr, and the terminal output  for timestep control displays “max increase”.

I would appreciate if someone can help me to solve this problem.


Cheers,


Chen Wen-Cong


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