[FLASH-USERS] 0A373464 at 6C91B665.8DE94F68

[Hansen, Eddie]

Hello,

Those r### variables are the specific radiation energies (erg / g) in each radiation group (e.g., r001 is for group 1, r002 for group 2, etc.).

You have to do a little bit of math to get nele and nion from the mass density and other variables. In the chk output (or in plt output if you add the appropriate plot_var’s), you can use ‘ye’ and ‘sumy’ like this:

nion = dens*sumy*Na
nele = dens*ye*Na

where Na is Avogadro’s number.

--
Eddie Hansen
Applications Group Leader
Flash Center for Computational Science


From: flash-users <flash-users-bounces at flash.rochester.edu> on behalf of Yun Hu <huyun at mail.ustc.edu.cn>
Date: Monday, June 16, 2025 at 5:59 AM
To: flash-users at flash.rochester.edu <flash-users at flash.rochester.edu>
Subject: [FLASH-USERS] 0A373464 at 6C91B665.8DE94F68
Dear FLASH code users:
      I am just a beginner to FLASH code. I plan to use FLASH code to simulate laser ablation X-ray emission. I put the r### in the plot_var list, so I can get the radiation information.
     The question is that, Is r### the distribution of X-ray emission? I wonder that. What I want is the X-ray intensity, But From the simulation result, I doubt whether this is the X-ray intensity. The result as follow is a laser beam irradiate the Al slab at an angle of 45°， the coordination is cylindrical . this is the beginning of the ablation. It seems the r003 is very weak at the spot location, and this is against the intuition. I also present the other pictures at different time, It seems the radiation is diffusing with the time. I don't know how to understand the physic explanation.
   I didn't find the density of electrons and ions also, so , how can I get the right X-ray intensity at a certain location, for example, the right or down boundary, or any slice of the slab?

  Looking forward for your guidance, thank you.
  For the pictures please see the attachment.


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