Search found 406 matches

by Ville Valtavirta
Fri Nov 27, 2020 9:46 am
Forum: Users
Topic: Lack of Photon Interaction Data in Library
Replies: 12
Views: 112

Re: Lack of Photon Interaction Data in Library

Hi,

try using the command from the instructions here: http://serpent.vtt.fi/mediawiki/index.p ... _libraries

-Ville
by Ville Valtavirta
Tue Nov 24, 2020 2:53 pm
Forum: Users
Topic: Lack of Photon Interaction Data in Library
Replies: 12
Views: 112

Re: Lack of Photon Interaction Data in Library

Hi, have you linked photon transport data to your calculation? See the point "Photon transport library is added in the set acelib card (this example uses the mcnp5 library)" in http://serpent.vtt.fi/mediawiki/index.php/Radioactive_decay_source,_practical_example#Photon_transport_simulation_using_rad...
by Ville Valtavirta
Fri Nov 20, 2020 2:51 pm
Forum: Users
Topic: Negative XS point in data while running EDEP3 during depletion
Replies: 3
Views: 34

Re: Negative XS point in data while running EDEP3 during depletion

Glad to hear that you managed to resolve it. Photon transport calculation needs to read in photoatomic cross section data, but it also allocates additional memory for the photon particle structures as neutrons and photons do not share particle banks. These two things will increase the memory consump...
by Ville Valtavirta
Fri Nov 20, 2020 12:59 pm
Forum: Users
Topic: Negative XS point in data while running EDEP3 during depletion
Replies: 3
Views: 34

Re: Negative XS point in data while running EDEP3 during depletion

Hi,

the "negative xs points in data" is simply a normal Serpent warning. It is not what is getting your calculation killed.

Are you maybe running out of memory or calculation time with your simulation which would get it cancelled by your slurm?

-Ville
by Ville Valtavirta
Thu Nov 19, 2020 3:23 pm
Forum: Input
Topic: Define a common universe among several universes
Replies: 3
Views: 72

Re: Define a common universe among several universes

Domenico, the surface limiting the copy-universes actually does not really matter as long as it is large enough. It can be an infinite surface ( inf ) since the outer boundary of the copy-universe gets limited eventually by something else as it is filled inside non-infinite cells. You can have uout,...
by Ville Valtavirta
Thu Nov 19, 2020 11:24 am
Forum: Input
Topic: Define a common universe among several universes
Replies: 3
Views: 72

Re: Define a common universe among several universes

Hi Domenico, this is possible, but requires you to be a bit creative and will affect e.g. the depletion zone indexing, which might be a problem if you have already generated a restart file for the model. I'll demonstrate this with the 2D BWR fuel assembly geometry from Serpent wiki. The geometry is ...
by Ville Valtavirta
Thu Nov 05, 2020 2:36 pm
Forum: Users
Topic: About Burnup value convergence
Replies: 3
Views: 117

Re: About Burnup value convergence

I can give a short explanation, although the reasons for such inconsistencies are somewhat complex, but on some level known issues. When looking at burnup calculations, we'll need to note that it is actually a coupled calculation with two parts The neutron transport part The depletion part (solving ...
by Ville Valtavirta
Tue Oct 27, 2020 2:49 pm
Forum: Users
Topic: BWR Water Rods Geometry
Replies: 8
Views: 2377

Re: BWR Water Rods Geometry

The example input files are nowadays found in the Serpent wiki. Here is a link to a BWR input with a water channel inside the assembly: http://serpent.vtt.fi/mediawiki/index.p ... y_geometry

-Ville
by Ville Valtavirta
Fri Oct 23, 2020 3:32 pm
Forum: Users
Topic: Pebbles motion
Replies: 1
Views: 61

Re: Pebbles motion

Hi, what do you exactly mean by "dynamically"? During a burnup calculation? One potential approach would be to save restart files after each depletion step and restart the simulation with updated coordinates in the file linked in the "pbed" card. (see http://serpent.vtt.fi/mediawiki/index.php/Input_...
by Ville Valtavirta
Tue Oct 20, 2020 1:28 pm
Forum: Compiling and installing Serpent
Topic: Some warnings when installing on macOS X
Replies: 3
Views: 926

Re: Some warnings when installing on macOS X

The use of bzero has been already dropped in the current development version so those errors should be fixed in the future updates. I guess we could also replace setlinebuf with setvbuf(stream, (char *)NULL, _IOLBF, 0); as per https://www.codecogs.com/library/computing/c/stdio.h/setbuf.php?alias=set...