An example might be handy. Say I have a cube bounded by 6 sides, my body
definition section would have:
XYP z_lo -10.
XYP z_hi 10.
YZP x_lo -10.
YZP x_hi 10.
XZP y_lo -10.
XZP y_hi 10.
My region definition for the cube would be:
-x_lo +x_hi -y_lo +y_hi -z_lo +z_hi
Now, for the surrounding (analogous to your 'void') region if I think in terms
of subtracting regions I would have:
+void -(-x_lo +x_hi -y_lo +y_hi -z_lo +z_hi )
If I think in terms of zones I would have:
+void +x_lo | +void -x_hi | +void +y_lo |+void -y_hi |+void +z_lo |+void -z_hi
no expansion in this case.
:) mary
On 05 October 2013 at 15:52 hayley.smith_at_stfc.ac.uk wrote:
> Dear Mary
>
> Thank you very much for your reply.
>
> I understand that the way I have this defined is making a lot of expansions
> and can see this in the output files.
> However, I am struggling to see how this can be simplified, as you suggest.
>
> From what I understand, only bodies can be subtracted, rather than regions. So
> I struggled to simplify in this sense. In the future my geometry will require
> twenty of these regions defined by planes, so the expansion would be even
> worse. In your experience what would you suggest as a simplification tactic?
>
> I tried making multiple voids, but this just propagated the expansion problem
> up to the black body. I think I am still missing some important concepts.
>
> Thanks for any further help you can give,
> Hayley
>
>
> ________________________________________
> From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on
> behalf of me_at_marychin.org [me_at_marychin.org]
> Sent: 04 October 2013 17:00
> To: Smith, Hayley (STFC,RAL,ISIS); fluka-discuss_at_fluka.org
> Subject: Re: [fluka-discuss]: Geometry Error
>
> Dear Hayley,
>
> The culprit is in the region definition of VOID. Too many expansions; fluka
> crashes. The debugger works by calling a 'dry' fluka run. So even if you do
> not use the debugger, fluka still will not run. To solve the problem you can
> simplify that line of region definition for VOID (which can be easily done
> using the geometry editor in flair).
>
> :) mary
>
> On 02 October 2013 at 13:49 hayley.smith_at_stfc.ac.uk wrote:
> Dear FLUKA users
>
> I am a relatively new user and have been having some difficulties creating the
> geometry for my current problem.
>
> I have an assembly of twenty graphite blocks, none of which are cubes. Each
> block has at least one slanted face. I have been trying to create these by
> using the generic infinite planes and combining these to describe individual
> blocks as regions. (From what I have read using PLA is the best tool for
> this?)
>
> I am able to create, debug and plot the geometry for individual blocks.
> However, when I wish to debug and plot the geometry of multiple blocks at once
> the debug routine slows down dramatically, and in the case of wanting to debug
> more than four of these blocks I receive the error “ERROR RC=34304”.
>
> I have been trying for a number of days to figure out my problem but have now
> run out of ideas. The geometry does not seem complex to me, so I was surprised
> that I encountered such an error. Am I asking too much of the memory
> capabilities? (I am working in Flair on FLUPIX with the standard installation
> settings as advised on the website).
>
> I have already tried to implement some ideas from the thread
> http://www.fluka.org/web_archive/earchive/new-fluka-discuss/5131.html however
> I haven’t had any luck, and can’t really see if my problem is even the same as
> the problem in that thread.
>
> I attach my input file, showing just a few of these blocks for which the debug
> crashes, in case it is required for further understanding of my problem.
> I am convinced I must be doing something significantly wrong, but am just not
> able to see it…
>
> Many thanks for any insight you are able to give
>
> Hayley
>
>
> --
> Scanned by iCritical.
>
>
> --
> Scanned by iCritical.
Received on Sat Oct 05 2013 - 18:49:31 CEST