[FLASH-USERS] Error in 4.8 and not 4.7.1

[赵旭]

Hi Arthur,

Maybe you can try 

use_auxEintEqn=.true.
eintSwitch       = 1e-4

together with 

irenorm =1

It works for me sometime.


Hope this works,

Xu

----- 原始邮件 -----
发件人: "Dr. Arthur Hirsch-Passicos" <a.hirsch at hzdr.de>
收件人: "flash-users" <flash-users at flash.rochester.edu>
发送时间: 星期一, 2024年 8 月 26日 下午 3:10:49
主题: [FLASH-USERS] Error in 4.8 and not 4.7.1

Dear Flash users, 

As I have observed some consequent differences between the results of my FLASH simulations between 4.7.1 and 4.8, I am looking at variations of my case. However, I met an issue with the 4.8 version that I don´t observe with the 4.7.1 version. 

The case are identical, they do have the exact same flash.par, Simulation_adjustEvolution.F90, Simulation_customizeProlong.F90, Simulation_data.F90, Simulation_init.F90 and Simulation_initBlock.F90. 

In the 4.8 run, I do get very quickly a message error: 

abort_message: [Eos] Error: too many iterations in Newton-Raphson 

which is due to negative dE/dt detected. 

I tried to set irenorm =1 and to increase eos_max Newton and eos_tolerance as seen on the archived thread ( [ https://flash.rochester.edu/pipermail/flash-users/2022-November/008229.html | https://flash.rochester.edu/pipermail/flash-users/2022-November/008229.html ] ) 

If one of you has an idea of the change made between versions that would cause that and/or have a fix for the Newton-Raphson issue, I would be very interested 

I here joined the .par file and the log files for both 4.8 and 4.7.1 

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. 

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-- 
Zhao Xu
Laboratory for Laser Plasmas (MoE)
Shanghai Jiao Tong University
800 Dongchuan Rd, Shanghai 200240