[mesa-users] gradT

[Ehsan Moravveji]

Thanks Bill for that,
Then, I wonder, what inhibits you to choose one over the other? Why do you report both?
Which one is the polished/final value? gradT?

Best regards,

Ehsan 



On May 17, 2014, at 6:10 PM, Bill Paxton wrote:

> The context of the lines you sent is important -- 
> 
> 
>      ! mlt results related to gradT are evaluated at each iteration and at end of step
>         real(dp), pointer :: gradT_sub_grada(:) ! difference at cell boundary
>         real(dp), pointer :: grada_at_face(:) ! grada evaluated at cell boundary
> 
>         real(dp), pointer :: actual_gradT(:) ! actual dlnT/dlnP (at boundary)
>            ! (dT/T_face)/(dP/P_face) with face values intepolated by mass
> 
>         real(dp), pointer :: gradT(:) ! dlnT/dlnP (at boundary)
> 
> 
> the lines you quote are part of the section on results from the mlt.   gradT is one of the mlt results.  it is the computed "correct" value that the model should achieve for dlnT/dlnP.    the "actual_gradT" is the value of dlnT/dlnP the model actually has.   they should be very close, but they won't be identical since the actual value is the outcome of the solver's attempt to satisfy 1000's of nasty nonlinear equations simultaneously.
> 
> 
> 
> 
> 
> 
> 
> 
> On May 17, 2014, at 1:40 AM, Ehsan Moravveji wrote:
> 
>> Hello all,
>>> From within /star/public/star_data.inc, I read:
>> 
>>     real(dp), pointer :: actual_gradT(:) ! actual dlnT/dlnP (at boundary)
>>        ! (dT/T_face)/(dP/P_face) with face values intepolated by mass
>>     real(dp), pointer :: gradT(:) ! dlnT/dlnP (at boundary)
>> 
>> I would like to know the difference between the two, and why do we have two such temperature gradients. 
>> 
>> Best regards
>> Ehsan.
>> 
>> 
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