[mesa-users] identity of 'v' in 'wd_ignite.mod'

Bill Paxton paxton at kitp.ucsb.edu
Thu Apr 2 12:14:35 EDT 2015


Hi,

Those are good questions, but they need to go to the mesa-users email list where there are lots of folks willing and able to help you.

If you haven't already done so, please sign-up for mesa-users and repost your message there.

Cheers,
Bill



On Apr 1, 2015, at 5:31 PM, Sumit Sarbadhicary wrote:

> Hello Dr. Paxton,
> 
> I am a graduate student and a new MESA user, working with version r7184 on a class project. I am a bit confused about the identity of a variable 'v', defined in wd_ignite.mod contained in the MESA test_suite folder, wd_ignite/. Is this the velocity of each Lagrangian mass shell? Or the convective velocity? Or something else?
> 
> I'm also a bit confused why there are two consecutive models in 'wd_ignite.mod', instead of one (as it says in the very first line below). I understand the purpose is to follow the evolution of an initial WD profile through the carbon ignition phase, but the requirement of two initial profiles eludes me.
> 
> The first few lines of 'wd_ignite.mod' are as follows. 'v' appears as one of the column headers (right of 'dq') :-
> ------------------------------------------------------------------------------------------------------------
> ! note: initial lines of file can contain comments
> 
> !
> 
>             12 -- two consecutive models for mesa/star, with velocity variables (v). cgs units. lnd=ln(density), lnT=ln(temperature), lnR=ln(radius), L=lumin\
> 
> osity, dq=fraction of total mstar in cell; remaining cols are mass fractions.
> 
> 
> 
>      year_month_day_when_created   20110717
> 
>                           M/Msun      1.0000000009434213E+00
> 
>                         star_age      9.4342161767044841E-01
> 
>                        initial_z      2.0000000000000000E-02
> 
>                         n_shells                            1273
> 
>                         net_name   'co_burn.net'
> 
>                          species                               9
> 
>                       tau_factor      1.5000000000000000E+02
> 
> 
> 
>                 lnd                        lnT                        lnR                          L                         dq                          v   \
> 
>                 h1                         he3                        he4                        c12                        n14                        o16   \
> 
>                      ne20                       mg24                       si28
> 
>     1    -1.0783032764354498E+01     1.1640541494135320E+01     2.0135894106074399E+01     4.8571750122419371E+32     1.4075930508271764E-14     1.1361104977\
> 
> 517480E-02     0.0000000000000000E+00     0.0000000000000000E+00     0.0000000000000000E+00     2.5000000000000000E-01     0.0000000000000000E+00     7.50000\
> 
> 00000000000E-01     0.0000000000000000E+00     0.0000000000000000E+00     0.0000000000000000E+00
> 
>     2    -8.2810274680451421E+00     1.2428434759429717E+01     2.0135268008479237E+01     4.8571750981602734E+32     1.1250008967110072E-14    -4.6362609302\
> 
> 080995E+02     0.0000000000000000E+00     0.0000000000000000E+00     0.0000000000000000E+00     2.5000000000000000E-01     0.0000000000000000E+00     7.50000\
> 
> 00000000000E-01     0.0000000000000000E+00     0.0000000000000000E+00     0.0000000000000000E+00
> 
>     3    -7.8621441999255000E+00     1.2633241562558258E+01     2.0135226974337208E+01     4.8522180474116445E+32     1.1678717762613631E-14    -5.3005735647\
> 
> 722219E+01     0.0000000000000000E+00     0.0000000000000000E+00     0.0000000000000000E+00     2.5000000000000000E-01     0.0000000000000000E+00     7.50000\
> 
> 00000000000E-01     0.0000000000000000E+00     0.0000000000000000E+00     0.0000000000000000E+00
> 
>     4    -7.6227340198235742E+00     1.2703597628288353E+01     2.0135198951381092E+01     4.8509545544014497E+32     6.1656608267007517E-15    -3.9122855811\
> 
> 425765E+01     0.0000000000000000E+00     0.0000000000000000E+00     0.0000000000000000E+00     2.5000000000000000E-01     0.0000000000000000E+00     7.50000\
> 
> 00000000000E-01     0.0000000000000000E+00     0.0000000000000000E+00     0.0000000000000000E+00
> 
> ------------------------------------------------------------------------------------------------------------------------------------------------------------
> 
> Apologies if the questions are too trivial or ill-defined. Looking forward to your reply!
> 
> Yours sincerely,
> 
> Sumit Sarbadhicary
> 
> University of Pittsburgh
> 

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