[mesa-users] Controls for Solver Tolerance

[Francis Timmes]

hi spencer,

have you tried using the simpler mesh_delta_coeff to increase
the number of cells and decrease the time step, hence check convergence?
only if you’ve already done that, then consider using varcontrol_target.

fxt



> On Nov 23, 2014, at 8:51 PM, Spencer C Wallace <spencerw at email.arizona.edu> wrote:
> 
> Hello,
> 
> I am working with some models and I have a hunch that the solutions to the structure and composition equations might not be precise enough for my purposes. I would like to run a series of models with increasingly strict tolerances for what the solver would consider a 'converged' solution. 
> 
> I found some inlist controls which looked useful:
> 
> tol_correction_norm = 3d-5
> tol_max_correction = 3d-3
> 
> max_iter_for_resid_tol1 = 4
> tol_residual_norm1 = 1d-4
> tol_max_residual1 = 1d-2
> 
> I tried lowering the value of 'tol_max_residual1' and turning up 'max_iter_for_resid_tol1'. Is this a good approach? I'm a little unclear what the difference between 'tol_residual_norm1' and 'tol_max_residual1' is. I'm not sure I understand what 'tol_correction_norm' and 'tol_max_correction' do either. Would anyone care to enlighten me?
> 
> Spencer Wallace
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