[mesa-users] Slow evolution in 1.5 Msun model

[Aaron Dotter]

Hi Ehsan,

You've certainly gone past central He depletion as your terminal output shows.  You may never achieve Teff < 3000 K for these stars unless you are using fancy mass loss and opacities.  If you just want central He depletion, use that alone to stop the calculation.  There is also something along the lines of "stop at 1st thermal pulse" that would take you a bit further.  How long it will take depends on your hardware, but it should not be more than ~5000 time steps.

Aaron



On Oct 18, 2012, at 7:23 PM, "Ehsan Moravveji" <moravveji at iasbs.ac.ir> wrote:

> 
> Dear all,
> I am running a grid of models of 1.5 to 2.5 Msun stars with v. 4589. The
> star is supposed to start from the pre-MS phase, and stop after the core
> He depletion once Teff < 3000.
> This is supposed to be a trivial evolution as my experience with massive
> tracks tell, in a sense that each model must finish in an hour or two.
> However, it is over 12 hours that even the first model has not finished.
> Here is the terminal output:
> 
> 
>       step    lg_Tcntr    Teff       lg_LH     lg_Lnuc     Mass      
> H_rich     H_cntr     N_cntr     Y_surf     X_avg     eta_cntr  
> pts  retry
>   lg_dt_yr    lg_Dcntr    lg_R       lg_L3a    lg_Lneu     lg_Mdot   
> H_poor     He_cntr    O_cntr     Z_surf     Y_avg     gam_cntr  iters
> bckup
>        age    lg_Pcntr    lg_L       lg_LZ     lg_Psurf    lg_Dsurf  
> He_poor    C_cntr     Ne_cntr    Z_cntr     Z_avg     v_div_cs    
> dt_limit
> __________________________________________________________________________________________________________________________________________________
> 
>      17250   8.032290   3384.687   3.079061   3.210327   1.347981  
> 0.819935   0.000000   0.000000   0.282155   0.427826  17.730055 
> 24225     81
>   3.351565   6.104060   2.073604   2.480932   1.982266  -8.135194  
> 0.528046   0.000000   0.661732   0.014063   0.196686   4.907572      4 
>   16
> 2.9688E+09  22.584314   3.218765   2.081776   3.222172  -8.111061  
> 0.449231   0.322686   0.001312  1.000E+00  3.755E-01  0.420E-06   
> varcontrol
> 
> 
> I noticed that the number of mesh points in the model is exceedingly high!
> That might be a reason for this slow evolution. True?
> I am sure that I never wanted such a fine mesh spacing as in from my inlist:
> 
>         mesh_delta_coeff = 0.8
>         varcontrol_target = 1d-4    ! to adjust the time steps
> 
> Is this typical of low-mass stars with mesa to take too long time to finish?
> Are there switches (except varcontrol_target) to speed up the evolution?
> I believe there must be a way to reduce the time cost when running a grid.
> 
> Thanks
> Ehsan.
> 
> 
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