[mesa-users] pseudo-Lagrangian scheme in MESA

Bill Paxton paxton at kitp.ucsb.edu
Sun Apr 17 19:41:28 EDT 2016

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!   


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
> ------------------------------------------------------------------------------
> Find and fix application performance issues faster with Applications Manager
> Applications Manager provides deep performance insights into multiple tiers of
> your business applications. It resolves application problems quickly and
> reduces your MTTR. Get your free trial!
> https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
> _______________________________________________
> mesa-users mailing list
> mesa-users at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/mesa-users

More information about the Mesa-users mailing list