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

[王荐钊]

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Thanks for your reply, I’m trying to simulate one laser beam (1kJ)  focus on a modulation target, I got the error at step 43576 when added Biermann battery term. In other simulations, I sometimes also met this error. I shared *.log file and output file in attachment. Thanks a lot!

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Best,
-----------------------------------------

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 <mailto:astrowjz at mail.bnu.edu.cn>
          astrowjz at 163.com



> On Aug 20, 2019, at 00:55, Benjamin Khiar <benjamin.khiar at gmail.com <mailto:benjamin.khiar at gmail.com>> wrote:
> 
> 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 <mailto: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/ <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 <mailto: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
> 
> <PastedGraphic-1.png>
> 
> [ERRORS]:
> 
> <Pasted Graphic 1.png>
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> 
> 
> ————————————————————
> 
> 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 <mailto:astrowjz at mail.bnu.edu.cn>
>           astrowjz at 163.com <mailto:astrowjz at 163.com>
> 
> 
> 
> 
> 

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