[mesa-users] Teff fluctuation

[Masanobu Kunitomo]

Hi Bill,

Thank you very much for replying so quickly! 

I understand the max timestep = 1d8 years cause the problem in version 6596. I also confirmed that Teff fluctuation disappeared with diffusion and setting max_years_for_timestep = 1d7. I will limit the timestep to 1d7 years in version 6596 with diffusion.

Thanks again!

Best regards,
Masa



2014/10/12 5:42、Bill Paxton <paxton at kitp.ucsb.edu> のメール：

> Hi Masanobu,
> 
> You've set max_years_for_timestep = 1d8 in your inlist.
> The example_solar test case sets max_years_for_timestep = 1d7.
> 
> Here's what I get with the inlist you sent and then after changing to the smaller max timestep.
> 
> max_years_for_timestep = 1d8
> <effective_T_1e8.pdf>
> 
> max_years_for_timestep = 1d7
> <effective_T_1e7.pdf>
> 
> Cheers,
> Bill
> 
> 
> 
> 
> 
> 
> 
> On Oct 10, 2014, at 11:01 PM, Masanobu Kunitomo wrote:
> 
>> Dear all,
>> 
>> In the solar-mass star calculation in version 6596, I found that Teff is fluctuating after ZAMS. The amplitude is about 100K, so it is not negligible. 
>> 
>> My settings are:
>> ---------------------------------
>> -no rotation
>> -create PMS model
>> -no mass loss/gain
>> -MLT: Henyey
>> -atm: photosphere_tables
>> -varcontrol_target = 1d-4
>> ---------------------------------
>> For more details, please check the attached inlist file.
>> 
>> I have not seen this fluctuation in the previous calculation under the similar settings with version 4798. And even in ver. 6596, when the diffusion was off, the fluctuation disappeared. 
>> 
>> My question is: Was the calculation of diffusion changed? Is there another reason for the fluctuation?
>> 
>> 
>> I apologise if it is a result of an old version. I appreciate any hints.
>> Thanks in advance!
>> 
>> 
>> Best reagards,
>> Masanobu
>> 
>> 
>> 
>> <inlist_solar>
>> 
>> <PastedGraphic-2.pdf>
>> 
>> 
>> 
>> 
>> 
>> 
>> --
>> Masanobu Kunitomo
>> Ph.D. student / JSPS Research Fellow
>> Tokyo Institute of Technology
>> Dept. of Earth and Planetary Sciences
>> Email: kunitomo at geo.titech.ac.jp
>> 
>> 
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