REC bodies generate geometry error

Geometry and Materials
1

Hi,
I am using a number of REC bodies in my geometry, which I have entirely constructed with the Geometry editor in FLAIR (I have not modified the numerical values manually).

I systematically get an abort for geometry errors, claiming that the axes are not perpendicular.

REC body77 155 -0.21400000D+04 -0.34961494D+02 -0.38700000D+04 -0.61743040D+03 0.00000000D+00 -0.35144076D+02 1567
-0.11542813D+02 0.00000000D+00 0.20279047D+03 0.00000000D+00 -0.21374486D+03 0.00000000D+00
REC body78 156 -0.21400000D+04 -0.34961494D+02 -0.38700000D+04 -0.61743040D+03 0.00000000D+00 -0.35144076D+02 1583
-0.99440823D+01 0.00000000D+00 0.17470309D+03 0.00000000D+00 -0.17371812D+03 0.00000000D+00
REC body79 157 -0.24985958D+04 -0.34961494D+02 -0.38722500D+04 -0.88261980D+03 0.00000000D+00 -0.32692274D+03 1599
-0.70551077D+02 0.00000000D+00 0.19047245D+03 0.00000000D+00 -0.21374486D+03 0.00000000D+00
Abort called from BODYGN reason REC HEIGHT NOT PERP. TO 1ST SEMIAXIS Run stopped!
STOP REC HEIGHT NOT PERP. TO 1ST SEMIAXIS

Is there a numerical issue when producing REC bodies in FLAIR … or am I missing something ?

Kind regards,

Markus

esps_exp.flair (61.8 KB)

2

Dear Markus,

thank you for reporting. We are currently investigating the issue.

Cheers,
David

3

Hi Markus,

flair is using 15digits of precision for the bodies, however since some contain a minus sign and a leading zero it ends with 13 significant in some of your REC and then fluka complains.
As a temporary remedy, you can use the Orthogonal button
image
Select all bodies or only the problematic ones, the Body context menu will appear and click
the Orthogonal which normally should fix the issue.

I will increase the significant precision of the bodies for the next release.

4

Many thanks ! (Another button’s function clarified :slight_smile: )