[fluka-discuss]: Can FLUKA start with errors in the geometry definition?

From: Franz Siegfried Englbrecht <Franz.Englbrecht_at_physik.uni-muenchen.de>
Date: Fri, 13 Mar 2015 18:10:32 +0100

Dear colleagues,

I am experiencing an unexpected behaviour with the combinatorial
geometry. FLUKA does not refuse to run when a wrong definition of one
body containing another one is defined in the input as follows:

My testcase consists of two cubes. Cube1 made of water and the smaller
cube2 made of air in the middle of cube1 (geo.png):

*The correct definition of this geometry would be (see attached beam.inp)
BLKBODY 5 +blkbody -void
VOID 5 +void -cube1
OUTER 5 +cube1 -cube2
INNER 5 +cube2

A 110 MeV proton beam (range ~9cm in water) is simulated.

A USRBIN is used to score the energydeposition in 1D in beamdirection (1.png).

*If I do not subtract the inner cube (cube2) from the outer one
(cube1), the inputfile looks like
BLKBODY 5 +blkbody -void
VOID 5 +void -cube1
OUTER 5 +cube1
INNER 5 +cube2

The geometry editor reports 'Errors found' for this case, but the
simulation of this geometry starts, runs without reporting an error
and produces a USRBIN.

The 1D energydeposition looks like FLUKA treated the inner cube as it
was water / non-existent (2.png).

Please find attached the inputfile with the correct definition, as
well as the two plots of depth vs energydensity.


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(image/png attachment: 1.png)

(image/png attachment: 2.png)

(image/png attachment: geo.png)

Received on Fri Mar 13 2015 - 19:32:59 CET

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