[mesa-users] Slow evolution in 1.5 Msun model
moravveji at iasbs.ac.ir
Thu Oct 18 04:23:53 EDT 2012
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
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
age lg_Pcntr lg_L lg_LZ lg_Psurf lg_Dsurf
He_poor C_cntr Ne_cntr Z_cntr Z_avg v_div_cs
17250 8.032290 3384.687 3.079061 3.210327 1.347981
0.819935 0.000000 0.000000 0.282155 0.427826 17.730055
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
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
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.
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