Search found 2034 matches

by Jaakko Leppänen
Thu May 23, 2019 9:50 am
Forum: Methods
Topic: External fission source of Cf252
Replies: 6
Views: 103

Re: External fission source of Cf252

Which Serpent version are you using? In my 2.1.31 the calculation is running with JEFF-3.1 data and decay source definition : src FissionSource sg Cf 1 sx -0.1 0.1 sy -0.1 0.1 sz -0.1 0.1 when the geometry is defined as: surf 1 sph 0.0 0.0 0.0 5.0 surf 2 sph 0 0 0 0.1 cell c0 0 Cf -2 cell c1 0 water...
by Jaakko Leppänen
Wed May 22, 2019 11:19 am
Forum: Bugs, problems, questions & feeback
Topic: MSR: Fatal error in function ProcessBurnMat
Replies: 8
Views: 63

Re: MSR: Fatal error in function ProcessBurnMat

OK. Thank you for pointing this out. I'll try to see if there's another solution to the problem when I have time...
by Jaakko Leppänen
Wed May 22, 2019 11:16 am
Forum: Users
Topic: Trying to match Keff between MCNP and Serpent
Replies: 3
Views: 32

Re: Trying to match Keff between MCNP and Serpent

Are you using the exact same ACE files? Have you checked the densities at the end of the .out output?

Which Serpent version are you using?
by Jaakko Leppänen
Mon May 20, 2019 2:25 pm
Forum: Bugs, problems, questions & feeback
Topic: Bugs in version 2.1.31
Replies: 10
Views: 88

Re: Bugs in version 2.1.31

The poor scalability is a bit strange result. Could you try if "set shbuf 1 1" will change the behavior? The buffer that is used for storing some intermediate data is not thread-private by default. Another option that may improve scalability in criticality source simulations is "set repro 0". This d...
by Jaakko Leppänen
Mon May 20, 2019 1:21 pm
Forum: Bugs, problems, questions & feeback
Topic: Bugs in version 2.1.31
Replies: 10
Views: 88

Re: Bugs in version 2.1.31

I don't see this large differences, but it may be machine dependent. One thing that was changed is the calculation of CMM diffusion coefficients. Since this parameter has no physical meaning unless calculated over the entire geometry, you might as well switch the calculation off with "set cmm 0". Th...
by Jaakko Leppänen
Mon May 20, 2019 12:08 pm
Forum: Bugs, problems, questions & feeback
Topic: Bugs in version 2.1.31
Replies: 10
Views: 88

Re: Bugs in version 2.1.31

Interesting. Could you send me the input so I can take a closer look?
by Jaakko Leppänen
Mon May 20, 2019 12:07 pm
Forum: Distribution
Topic: For getting SERPENT code
Replies: 1
Views: 18

Re: For getting SERPENT code

Unfortunately there is not much we can do. The NEA Data Bank has a procedure to distribute their codes to non-member organizations, but this has been suspended for several years now. I recommend you contact the Data Bank directly and ask if they can help you somehow.
by Jaakko Leppänen
Mon May 20, 2019 10:26 am
Forum: Input
Topic: Irregular 3D geometries (CAD, etc.)
Replies: 38
Views: 61905

Re: Irregular 3D geometries (CAD, etc.)

I've encountered the term while working on some STL geometry routines, where barycentric coordinates are calculated to check whether the ray passes through a triangulated surface. Could the error mean that some of the points forming the cell boundaries coincide? This may not be a problem for CFD or ...
by Jaakko Leppänen
Sun May 19, 2019 8:58 pm
Forum: Bugs, problems, questions & feeback
Topic: MSR: Fatal error in function ProcessBurnMat
Replies: 8
Views: 63

Re: MSR: Fatal error in function ProcessBurnMat

The routine works with materials, not universes, but burnable materials are renamed for depletion zone division when they are associated with pin-type universes, so changing the pin universes to surface-cell type universes may be worth the shot.
by Jaakko Leppänen
Sun May 19, 2019 8:53 pm
Forum: Methods
Topic: External fission source of Cf252
Replies: 6
Views: 103

Re: External fission source of Cf252

The first error probably means that the decay data library doesn't have data for Cf252 spontaneous fission. Try using JEFF-3.1 instead. For the the second format you should use the "sb" option of the source card: http://serpent.vtt.fi/mediawiki/index.php/Input_syntax_manual#src_sb Note that the form...