[mesa-users] official release: mesa version 6794 is now available
fxt44 at mac.com
Sun Jul 20 22:41:00 EDT 2014
MESA version 6794 is now available.
The simplest way to get MESA, with the smallest footprint, is to
download the ~1 GB zip file. You may, of course, continue to use svn.
see http://mesa.sourceforge.net/prereqs.html for the details.
below is an outline of the changes since the last release (6596, June 4, 2014).
Documentation - Josiah, Frank
The files controls.defaults, star_job.defaults, and pgstar.defaults
have been reformatted to make it easier for markup langauges (and humans!)
to parse the structure of these files. For example, these reformatted files
allow for improved online documentation of each of MESA's adjustable parameters:
Mixing - Bill
Seperate controls for semiconvection and thermohaline mixing
Previous versions allowed for both or neither semiconvection and thermohaline mixing
by setting the flag "use_Ledoux_criterion" to be true or false. This single flag is
now replaced by two flags
The first flag enables semiconvection and the second enables thermohaline mixing. It is
now possible to turn both off, one off and the other on, or both on.
Rotation - Bill, Pascale, Corentin
Angular Momentum Viscosity
Corentin Cadiou found a bug in star/private/mix_info, and as a side effect of fixing it
there has been a redefinition of a few controls. The old controls
are replaced by
to indicate that they apply to am_nu_non_rot.
Chemical Mixing By Rotation
The following changes to the default angular momentm and chemical mixing by rotation
were requested by Pascale Garaud, who will fill in details in a followup email to mesa-users.
am_nu_visc_factor = -1 << this defaulted to value of D_visc_factor which was =0 by default
am_D_mix_factor = 0.0333333333333333d0 << chem mixing by rotation was on by default
D_DSI_factor = 1
D_SH_factor = 1
D_SSI_factor = 1
D_ES_factor = 1
D_GSF_factor = 1
D_ST_factor = 1
am_nu_visc_factor = 1 <<< viscosity is now included in angular momentum transport by default
am_D_mix_factor = 0 <<< chem mixing by rotation is now off by default
D_DSI_factor = 0
D_SH_factor = 0
D_SSI_factor = 0
D_ES_factor = 0
D_GSF_factor = 0
D_ST_factor = 0
Networks - Bill, Frank
Larger nets to core-collapse
Three new test suite cases illustrate the capability of using reaction networks
containing a few hundred isotopes for the advanced stages of evolution in massive stars
30M_big_net - silicon core burn
30M_logT_9.8_big_net - silicon shell burning
30M_core_collpase_big_net - final infall
These all use the mesa_201.net without NSE or QSE approximations.
The approx21 nets now have variants that include co56 with physical electron capture rates
from ni56 to co56 and co56 to fe56. The conversion of fe56 to a neutron rich isotope is
handled the same as in the approx21 nets without co56, namely by an artificial rate of
electron capture that is a given factor times the ni56 electron capture rate. The isotope
co56 shows up in significant amounts during the late stages just before core collapse.
Pgstar - Bill, Frank, Broxton, Dean
Abundance profile plots
The control name "Adundance_which_isos_to_show"
has changed to "Abundance_which_isos_to_show".
This typo correction in the control name will require you to adjust
the spelling in your Abundance profile plots. As an explicit example,
! isotopes to plot
Abundance_num_isos_to_show = 1
Adundance_which_isos_to_show(1) = 'h1'
must be changed to
! isotopes to plot
Abundance_num_isos_to_show = 1
Abundance_which_isos_to_show(1) = 'h1'
Added a control to show the locations of the "inner" and "outer" boundaries
used in the mass gain/loss remeshing procedure described in section 6.2 of
mesa I instrument paper. In addition, the location of newly accreted material
is also shown.
show_TRho_accretion_mesh_borders = .false. by default
Added a control to change the x-coordinate to mass coordinate.
TRho_switch_to_mass = .false. by default
Profile Panel Plots
The underlying mass grid, or more precisely the boundaries between cells in MESA's
finite volume scheme, on all Profile Panel plots can be shown by toggling the logical
Profile_Panels[1-9]_show_grid = .true. / .false.
This can be useful for visually checking there is adequate mass/spatial resolution
in regions of interest, tracking moving fronts, and so on.
Grid plots are now treated like all the other kinds of plots with an
optional title, age, and model at top. New controls for setting the
size and position of the title, age, model:
Age and model number are now only shown for the Grid plot, not for every subplots.
New controls for adjusting the label-to-axis spacing for all subplots
and finally new controls for titles on Grid plots
A new control for adjusting the line width of pgstar plots
See the star/defaults/pgstar.defaults or http://mesa.sourceforge.net/pgstar_defaults.html for details.
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