[mesa-users] pseudo-Lagrangian scheme in MESA

[Bill Paxton]

Hi JC,

Dean Townsley and I struggled with the terminology in section 7 of the recent mesa instrument paper where is topic is covered in some detail.  Could you please refer to that with a set of more specific questions.  Dean and I will try to answer, although we aren't likely to completely agree about how to say what we both know is going on in the code!   

Cheers,
Bill




On Apr 17, 2016, at 4:35 PM, Jean-Claude Passy wrote:

> Dear all,
> 
> I have some conceptual questions regarding the numerical scheme used in MESA for mass loss/accretion.
> MESA (among other codes) is said to use a pseudo-lagrangian approach in the outer region of the star to solve the stellar equations. My questions are the following:
> 
> 	1) Does it mean that a) the equations are written and solved as a function of q (so there is an extra term in the partial time derivative); or b) the equations are still written in the Lagrangian form and some rescaling is applied (Section 6.6 in Paxton et al. 2011)?
> 
> 	2) Why doing that? It must be for numerical reasons, and I’d love to get the details.
> 
> 	3) Where are the relevant pieces of code doing that?
> 
> 
> Hope that someone can clarify things for me.
> 
> Cheers,
> 
> JC
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