[fluka-discuss]: RE: FLAIR pre-processing expressions and potentially dangerous situations

From: Vasilis Vlachoudis <Vasilis.Vlachoudis_at_cern.ch>
Date: Fri, 23 Mar 2018 16:26:48 +0000

Hi Sunil,

the expression in flair are saved as comments in the .inp preceding the card with the format
while on the CARD in the line that follows flair substitutes with the numerical result of the expression
that fluka understands.
If you manually edit the input file with a text editor, and you change the number,
flair will revert to the expression result.

To summarize:
- If you work solely with flair, flair recomputes everything and updates the
 input file with the correct expression results, so you don't have any problem
- If you edit the file with a text editor, as it is written in the manual you have
  to be careful when an expression is involved, and it is wise to open and
  save it with flair to update the changes or even with "flair -u" from the command
  line to recompute all expressions.
- In the new release I am preparing all expressions will be saved in the .flair
  file and try to ensure a proper synchronization between the inp and the flair.


From: Sunil C [csunil11_at_gmail.com]
Sent: Friday, March 23, 2018 16:54
To: Vasilis Vlachoudis; Alfredo Ferrari; fluka-discuss
Subject: FLAIR pre-processing expressions and potentially dangerous situations

Dear Alfredo and Vasilis

I am interested in knowing more about the potentially dangerous situations that is being alluded to in the release notes<http://www.fluka.org/web_archive/earchive/new-fluka-discuss/11289.html> when FLAIR pre-processor expressions such as !_at_what.1 are used.

Are the effects observed when they are used in any or all of the input cards ?

I have inputs that use such pre-processors substantially and inter-dependently in geometry, beam parameters, material definitions, scoring cards, rot -defi and many more. I also occasionally edit the .inp and the .flair files with vi.

With the latest FLUKA release, I see the output file has warnings about this feature and the limited support for it.

It will be interesting to know about the possible causes and effects when such features are used.

Cheers, Sunil

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Received on Fri Mar 23 2018 - 18:37:00 CET

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