[mesa-users] dlnRho_dlnT_const_Pgas, dlnRho_dlnPgas_const_T

[Francis Timmes]

> Ok thanks very much Robert and Bill.
> 
>> Can i ask why you want those terms? 
>> 
> 
> They appear in an equation I'm trying to implement in the other_d_mix routine. 

a potential workaround is to use chiT and chiRho and P = Pgas + Prad 
to extract the desired eos derivatives within your other_d_mix routine.

fxt




>  
> 
> Whats happened is that mesa has an option to either use lnPgas (ln gas pressure) or lnd (ln density) as a variable in the equations. By default we use lnd, thus those dlnRho terms are not defined. Either you can set to true:
> 
>          !### change_lnPgas_flag
>          !### change_initial_lnPgas_flag
>          !### new_lnPgas_flag
>          ! lnPgas variables
>          ! `lnPgas_flag` is true if we are using lnPgas variables in place of lnd
> 
>       change_lnPgas_flag = .false.
>       change_initial_lnPgas_flag = .false.
>       new_lnPgas_flag = .false.
> 
> In your stars inlist to switch to lnPgas, or if i know why you want those terms i could suggest another set of d... terms that are useful for you.
> 
> Have a look in star/private/profile_getval and you'll see you need s% lnPgas_flag to be true to get a value.
> 
> Rob
> 
> 
> On Tue, Jun 21, 2016 at 6:30 PM, Martin C. <martincs14 at gmail.com> wrote:
> Hi,
> In my profiles*.data files, for 
> dlnRho_dlnT_const_Pgas    and
> dlnRho_dlnPgas_const_T 
> I get just zeros. 
> 
> When I put 
> 
>          do k = 1,s% nz,30
>             print*,k, s% dlnRho_dlnT_const_Pgas(k)
>          end do
> 
> in extras_finish_step, I get just NaN.
> 
> Is this normal, or what don't I understand.
> 
> I'm just using the 'default' star work folder,
> mesa 8118, ubuntu14
> 
> thanks,
> 
> Martin
> 
> 
> 
> 
> -- 
> Martin C.
> 
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> -- 
> Martin C.
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