Re: [fluka-discuss]: Errors in Geometry

From: Andrea Fontana <andrea.fontana_at_pv.infn.it>
Date: Tue, 10 Dec 2019 15:25:40 +0100

Dear Jyoti,
    I had a look at your input file and I see that you define
your regions by placing 48 RPP bodies adjacent to each other:
I believe that this is creating problems during tracking due to the
numerical precision of the calculation and generates your error.

In essence, if you have two RPPs with a coincident face, when
a particle is on that face (with a given numerical precision)
to which body will it belong? This is the problem...

You will see many errors that will look like this one:

---
Geofar: Particle in region    19 (cell #    0) in position 
1.000000000E-01 -3.247844229E+01  1.000756559E+02
   is now causing trouble, requesting a step of  5.085678683E-01 cm
   to direction -7.217862431E-01 -5.470983808E-01  4.239197814E-01, 
error count:  0
   R2:  3.247859623E+01 R3:  1.052140490E+02 cm
   X*U   (2D):  1.769672456E+01 X*U   (3D):  6.012077471E+01 cm
   X*UOLD(2D): -2.658825901E+01 X*UOLD(3D):  3.018230355E+01 cm
   Kloop:        434, Irsave:     67, Irsav2:     19, error code: -33 
Nfrom:  5000
   old direction -9.211331991E-02  8.183596814E-01 5.672764478E-01, 
lagain, lstnew, lsense, lsnsct  F  F  F  F
   Particle index    7 total energy   3.065328501E-04 GeV  Nsurf 35
  Try again to establish the current region  moving the particle of a  
1.420397324E-08 long step
  We succeeded in saving the particle:  current region is n.    19 (cell 
#    0)
---
beacuse the particle cannot be assigned by FLUKA to any region.
To avoid it, as recommended in the FLUKA manual and in the
slides shown at the courses, it is much better to define a
bigger volume and to segment it with infinite planes: the
various regions can be defined with the available boolean
operators. For an example, you can inspect the default FLUKA
exercise in the installation directory ("example.inp"), in which
a cylindrical target is divided in two regions by an infinite
plane. See also the manual, chapter 8.
Hope this helps and kind regards,
Andrea
On 10/12/2019 10:31, Jyoti wrote:
>
> Dear FLUKA Users,
> When I run my input, it shows TIMED-OUT.
> On checking the error, "Too many errors in geometry" is written (Image 1).
> While in Geometry, there is no error displayed (Image 2).
> Please find the input file attached.
>
> What is the issue?
>
> With Regards,
> Jyoti
>
>
-- 
========================================================================
Dr. Andrea Fontana                    tel: +39 0382 987991
Istituto Nazionale                    fax: +39 0382 423241
di Fisica Nucleare
Sezione di Pavia                      e-mail: andrea.fontana_at_pv.infn.it
Via Bassi 6                           web   : www.pv.infn.it/~fontana
27100 PAVIA, Italy
========================================================================
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Received on Tue Dec 10 2019 - 16:53:06 CET