[FLASH-USERS] huge jump of hydrodynamic properties

[Ernesto Zurbriggen]

Hi Maksim!

It may happen your perturbation is too strong. It generates a ~10^4
pressure jump which is pretty much.
To support that you will need a strong setup.

You could try either beginning with a much less energetic pulse, let's say
a ~5 pressure jump,
or: increase your spatial resolution; use a more diffusive
riermannSolver and slopeLimiter;
setting smaller cfl values, etc.

Best for you!




El vie, 12 feb 2021 a las 1:56, Maksim Kozlov (<maksim.kozlov at nu.edu.kz>)
escribió:

> Dear Friends,
> I would really appreciate your help with the following issue:
> I am running a SBlast simulation in 3D - hydrodynamic expansion of initial
> perturbation with two fluids (3D graph of initial perturbation of internal
> energy is attached - energyZ). Simulation starts to execute perfectly -
> initial ball-shaped perturbation starts to expand but between 16th and 17th
> time step (please see attached slices of distributions of density, pressure
> and internal energy) something happens - in a few cells values of density,
> pressure and internal energy  become crazy ~10^38 and code crashes after
> that with Floating point exception - erroneous arithmetic operation. Any
> ideas on what can cause this problem or how can I track it down would be
> greatly appreciated!
> Thank you very much!
>


-- 
*Dr. Ernesto Zurbriggen, FAPESP posdoctoral fellow*



*Email: ernesto.zurbriggen at craam.mackenzie.br
<ernesto.zurbriggen at craam.mackenzie.br>Phone: +55 11-2114-8783*
*Universidade Presbiteriana Mackenzie, *
*Escola de Engenharia, *
*Centro de Rádio Astronomia e Astrofísica Mackenzie (CRAAM),*
*Rua da Consolação 896, 01302-907, SP, São Paulo, Brasil.*
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