[Mesa-users] Evaluating rates been truncated when the lgT is above 10.000
paxton at kitp.ucsb.edu
Sun Dec 27 01:52:09 EST 2020
> On Dec 26, 2020, at 5:44 PM, Francis Timmes via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> hi long,
> published fits to tabulated thermonuclear reaction data are usually done
> temperatures less than 1e10k. evaluating those fits beyond this upper bound
> can produce silly numbers, hence the clipping and warning. as material at
> these temperatures is generally in nuclear statistical equilibrium,
> such clipping is unlikely to significantly impact the evolution.
Frank has it right of course. One implementation detail to consider. For such high T’s, you should be doing “op_split_burn” in mesa/star so that it can deal with the integration challenge. For the test_suite cases that do core collapse, you’ll find things like this in the inlists:
op_split_burn = .true.
op_split_burn_min_T = 1d9
burn_steps_limit = 150
burn_steps_hard_limit = 250
op_split_burn_eps = 1d-5
op_split_burn_odescal = 1d-5
>> On Dec 24, 2020, at 3:14 PM, 姜龙 via Mesa-users <mesa-users at lists.mesastar.org> wrote:
>> Dear all,
>> When running to FeCCSN of Helium star, I encounter a list of warnings like:
>> "evaluating rates with lgT=10.042050 which is above lgT=10.0000, rates have been truncated"
>> Question: Is the truncation affect the results of evolution? If Yes, how to avoid it or anything to do?
>> Best wishes.
>> mesa-users at lists.mesastar.org
> mesa-users at lists.mesastar.org
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