[Mesa-users] change mesh/number of zones

[Bill Paxton]

Hi Amber,

what happens if you change mesh_delta_factor and then run for a few steps with a small max timestep to let the standard evolution code revise the mesh?   that’s approximately what you would get with a “relax”.  next step up in complexity would be to gradually change mesh_delta_factor step-by-step from run_star_extras; that’s even more like relax.   then the ultimate would be for you to use the relax machinery from run_star_extras by calling the routine star_evolve_to_check_point in star_lib.  it is exactly the same algorithmic structure as the various built in relax operations.

cheers,
bill



> On Mar 4, 2019, at 1:24 PM, amber lauer via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> 
> If I'm running a model that starts from a saved model with a number of zones, say "X", what's the best way to change the number of zones to something else, say aX, or a+X, or even just a constant number? The ideal solution would turn the rest of the physics off, similar to a relaxation routine. I checked star_job for the various relaxation routines and also the mesh adjustment section in controls but nothing was immediately obvious to me as strictly changing nz. Thanks. 
> 
> -- 
> Amber Lauer
> Postdoctoral Researcher
> Triangle Universities Nuclear Lab
> Duke University
> amber.lauer at tunl.duke.edu <mailto:amber.lauer at duke.edu>_______________________________________________
> mesa-users at lists.mesastar.org
> https://lists.mesastar.org/mailman/listinfo/mesa-users
> 

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