[mesa-users] About eos and kap module

[Francis Timmes]

zbar = <Z> = the mean atomic number, the mean charge, of the composition.
for pure hydrogen zbar=1, for pure helium zbar=2, and so on.
set zbar to reflect the composition of the material.

ok?

fxt


> On Sep 3, 2015, at 6:31 AM, 无心 <63825174 at qq.com> wrote:
> 
> Hi Josiah,
>  
> Thank you for your tip and now i basically can modify those sample programs to get my result. But i still have one question:
>  
> in sample_kap.f, calling kap_get_Type1 function, there is a parameter zbar, you give the init value zbar=1.5 and comment says : needed for electron conduction at high rho. I do not know whether this parameter should be modified in my program or it fixed to 1.5 is ok? If not ok, what range for this parameter and how should i estimate the init value?
>  
> and similar as above, in sample_eos.f eosDT_get function there are zbar and abar parameters. In this program they are get from Init_Compositon function, i think in most cases i need not modify this function to get other value in addition to T,rho,X,Z, is that right?
>  
> Thank you for your help in advance
>  
> Chen DanDan
> 
> 
> ------------------ Original ------------------
> Hi DanDan,
> 
> The answers to both these questions are contained in the sample_eos.f
> code.  You need to read the code and try and understand it.  There's no
> way around that.  It is only 233 lines, so that's doable a few hours.
> 
> Here are some questions to think about while you read it.
> 
> > Could you tell me which function can i call in order to get gamma1 and
> > gamm3 parameter from T and Rho input?
> 
> What does the comment on line 84 mean?
> 
>   ! the indices for the results are defined in eos_def.f
> 
> How is the code retrieving the results to display?  What sorts of
> things are in eos/public/eos_def.f?
> 
> > And i still find there are eosDE,eosDT,eosPT,eosQT, could you tell me
> > the difference of them?
> 
> There is a call to eos_DT on line 85.  What does the preceding comment
> say?  There is a call to eos_PT on line 109.  How does this look
> different than the call to eos_DT?
> 
> Best,
> Josiah
> 
> P.S. Line numbers are from r7624.
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