[mesa-users] MESA in education -- where's the website for this?

[Bill Paxton]

Hi Noah,

There is a test case that runs Z=0.02, 1Msun from pre-main-sequence to cool white dwarf.  You should run that test to get an idea of where the runtime is spent --- e.g., climbing the RGB.  Then let us know what you find.  Perhaps you'll find ways to save models along the way so that students can use them to run different interesting parts of the evolution (e.g., he core flash) without the computational cost of running the entire evolution.  I think that's probably a better approach than trying to make a "brain dead" version of mesa that gives up lots of accuracy in an attempt to run fast.  (for the fast but loose approach, you might want to run my old "EZ" code -- but I don't recommend it.)

bill

btw: it is okay to say "thank you" when I volunteer to look at something for you. ;D




On Oct 18, 2015, at 1:00 PM, Glasman, Noah B wrote:

> Here is my inlist_project for that run. I am just trying to run the entire life of a 1Msun star with Z = 0.001. Does anyone know if MESA works on OSX El Capitan yet?
> 
> ! inlist to evolve a 15 solar mass star
> 
> ! For the sake of future readers of this file (yourself included),
> ! ONLY include the controls you are actually using.  DO NOT include
> ! all of the other controls that simply have their default values.
> 
> &star_job
> 
>   ! begin with a pre-main sequence model
>     create_pre_main_sequence_model = .true. 
> 
>   ! save a model at the end of the run
>     save_model_when_terminate = .false.
>     save_model_filename = '15M_at_TAMS.mod'
> 
>   ! display on-screen plots
>     pgstar_flag = .true.
> 
> / !end of star_job namelist
> 
> 
> &controls
> 
>   ! starting specifications
>     initial_mass = 1 ! in Msun units
>     initial_Z = 0.001
>     !max_model_number = -1
> 
>   ! stop when the star nears ZAMS (Lnuc/L > 0.99)
>     !Lnuc_div_L_zams_limit = 0.99d0
>     !stop_near_zams = .false.
> 
>   ! stop when the center mass fraction of h1 drops below this limit
>     !xa_central_lower_limit_species(1) = 'h1'
>     !xa_central_lower_limit(1) = 1d-3
> 
> / ! end of controls namelist
> 
> 
> 
> 
> From: Bill Paxton <paxton at kitp.ucsb.edu>
> Sent: Sunday, October 18, 2015 12:23 PM
> To: mesa-users at lists.sourceforge.net group group
> Subject: [mesa-users] MESA in education -- where's the website for this?
>  
> Dear MESA-USERS who use mesa for teaching,
> 
> How do you manage with the issues Noah raises in the attached email?  
> 
> Have you found problems that are good for combining academic interest and short runtimes?
> 
> Wouldn't it be great if there were a website/forum/social-media-something-or-other specifically to serve "mesa in education"?
> 
> -Bill
> 
> 
> 
> 
> On Oct 17, 2015, at 6:05 PM, Glasman, Noah B wrote:
> 
>> I am wondering if there is a way to speed up how fast MESA runs on my computer? At the moment it takes an hour plus to run it for a 1Msun star with Z = 0.001 and after an hour it's only at 6.349e9 years. Is there something I can do to speed up the program or maybe allocate how much ram it uses? At the pace it is going it is almost impractical to use for any research or classwork for my Astronomy class. I have a 2012 Macbook Pro 13 inch, 4gb DDR3 RAM, 2.5 GHz Intel Core i5 cpu, with OSX 10.10.5. I am running MESA-r7624, with  Version 20150908 of the MESA-sdk.
>> 
>> 
>> Sincerely,
>> Noah Glasman 
>> ------------------------------------------------------------------------------
>> _______________________________________________
>> mesa-users mailing list
>> mesa-users at lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/mesa-users
> 
> 

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