[FLASH-USERS] [Hydro]: Computed dt is not positive! Aborting!

[Benjamin Khiar]

Hey J.Z.,

In addition to what Ryan said, to better help you, it would be helpful for
us to know more about your simulation:
- What are you trying to do ?
- Share your *.log file
- Maybe show some outputs
...

Cheers,
-- 
Benjamin Khiar
Postdoctoral researcher
FLASH Center for Computational Science
University of Chicago

Le dim. 18 août 2019 à 23:43, Ryan Farber <rjfarber at umich.edu> a écrit :

> Hi J.Z.,
>
> In general, dt becomes very small because either
> 1) bulk speed becomes very large
> 2) sound speed becomes very large
> 3) alfven speed becomes very large
>
> Since you mentioned Biermann battery, I would guess the magnetic field
> becomes too strong. You can check which is the culprit either by computing
> the speeds from an output file using for example yt:
> https://yt-project.org/ Or, you can check the *.dat file.
>
> Best,
> --------
> Ryan
>
>
> On Sun, Aug 18, 2019 at 7:26 PM 王荐钊 <astrowjz at mail.bnu.edu.cn> wrote:
>
>> Hello FLASH USERS !
>>
>> When I add Biermann Battery module to my simulation like this, after
>> running many steps, I will get an error message “[Hydro]: Computed dt is
>> not positive! Aborting!” I think it is related to documents
>> “Hydro_computeDt.F90” and “hy_uhd_dataReconstOneStep.F90”, but I don’t know
>> how to fix it. So any advice?
>>
>> Thanks,
>> J.Z. Wang
>>
>>
>> [ERRORS]:
>>
>>
>>
>>
>>
>> ————————————————————
>>
>> Jianzhao Wang
>>
>> Department of Astronomy, Beijing Normal University
>> No.19, Xinjiekouwai Street, Haidian District, Beijing, 100875
>>
>> Tel: +86 13141149966
>> Email:astrowjz at mail.bnu.edu.cn <astrowjz at mail.bnu.edu.cn>
>>           astrowjz at 163.com
>>
>>
>>
>>
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