[FLASH-USERS] Strong differences between 4.7.1 and 4.8

[Reyes, Adam]

Hi Arthur,

Do you have a parfile for the cartesian case that you show? This is quite unexpected as there hasn't been any changes to the energy deposition in 4.8.
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Adam Reyes


Code Group Leader, Flash Center for Computational Science  
Research Scientist, Dept. of Physics and Astronomy
University of Rochester
River Campus: Bausch and Lomb Hall, 369  
500 Wilson Blvd. PO Box 270171, Rochester, NY 14627
Email adam.reyes at rochester.edu
Web https://flash.rochester.edu
 (he / him / his)


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> On Sep 3, 2024, at 9:24 AM, Dr. Arthur Hirsch-Passicos <a.hirsch at hzdr.de> wrote:
> 
> Dear Flash users,
> 
> I noticed  some strong differences between my FLASH cases between 4.7.1 and 4.8. As I had changed quite a few parameters from the base of LaserSlab to my case, I came back to LaserSlab and applies variations of my parameters progressively.
> 
> While the base LaserSlab case presented some small variations (of the order of a few % in ion temperature in the joined images), the differences became massive when I switched from cylindrical to cartesian grid, with a factor 4 increase of the ion temperature in the joined images, increasing to a factor 10 at the end of the simulation (Both set of images joined).
> 
> I have seen the same kind of results on short pulse simulations and on lower timescale, making me think it is not due to the change on HeatExchange and PlasmaState decribed in the changelog. As I see it, they would improve the propagation of absorbed energy through the target and not increase the level of absorbed energy. But I have not find a change in the energy deposition that would explain any of the observed results.
> 
> Does any of you have an explanation of what would be the reason for such changes?
> 
> I joined images of the ion temperature in both versions for the cartesian and cylindrical simulations as well as the par file for the cartesian case.
> 
> Thank you in advance for your help
> 
> Best regards,
> 
> -- 
> Dr. Arthur Hirsch-Passicos
> Post-doctoral Researcher
> 
> Laser Particle Acceleration Division
> Institute of Radiation Physics
> Helmholtz-Zentrum Dresden-Rossendorf e.V.
> <Cartesian_0P18ns_Flash48.png><Cartesian_0P18ns_Flash471.png><Cartesian_2ns_Flash48.png><Cartesian_2ns_Flash471.png><Cylindrical_0P18ns_Flash48.png><Cylindrical_0P18ns_Flash471.png><Cylindrical_2ns_Flash48.png><Cylindrical_2ns_Flash471.png><flash.par>_______________________________________________
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> 
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