Search found 27 matches

by Antti Rintala
Thu Sep 17, 2020 4:10 pm
Forum: Users
Topic: ECCO-1968 Neutron Energy Group Structure
Replies: 9
Views: 65

Re: ECCO-1968 Neutron Energy Group Structure

So what's the actual problem? If you want to have an energy grid with higher energies, you can just create with ene input card: http://serpent.vtt.fi/mediawiki/index.php/Input_syntax_manual#ene_.28energy_grid_definition.29. However, much of the usually available neutron cross section data is not pre...
by Antti Rintala
Thu Sep 17, 2020 3:38 pm
Forum: Users
Topic: ECCO-1968 Neutron Energy Group Structure
Replies: 9
Views: 65

Re: ECCO-1968 Neutron Energy Group Structure

Note that the energy grid on the Serpent wiki page is defined in units of MeV. The range for ECCO-1968 is from almost 20 MeV to almost 1E-11 MeV.
by Antti Rintala
Wed Sep 16, 2020 1:47 pm
Forum: Users
Topic: B1 Diffusion Coefficient according to burn-up step
Replies: 1
Views: 63

Re: B1 Diffusion Coefficient according to burn-up step

Interesting results. It seems that you have used ENDF/B-VIII.0 libraries? I tried replicating this behavior with ENDF/B-VII.1 libraries, but the results show nice smooth behavior. Did you use some publicly available ACE data?
by Antti Rintala
Wed Jul 15, 2020 7:44 am
Forum: Misc. topics
Topic: Cores vs. Threads for OMP?
Replies: 1
Views: 176

Re: Cores vs. Threads for OMP?

The best you can do is to test our input with both options to see whether you can have any gains from using all the threads.
by Antti Rintala
Fri Jun 12, 2020 8:03 am
Forum: Bug reports
Topic: Discountinuities on surface net current and flux
Replies: 4
Views: 427

Re: Discountinuities on surface net current and flux

Could you provide more information on your problem? It is impossible to say anything based on this report. What values did you compare? Detector values or values provided by set adf card? What are the boundary surfaces of the to universes to be homogenized? Are you comparing heterogeneous or homogen...
by Antti Rintala
Mon Jun 08, 2020 8:38 am
Forum: Compiling and installing Serpent
Topic: Compiling Serpent 2.1.31 with OpenMP: issue with gcc 9
Replies: 7
Views: 886

Re: Compiling Serpent 2.1.31 with OpenMP: issue with gcc 9

I can confirm the same behaviour with Ubuntu 20.04 gcc 9.3. Changing to default(shared) helped, but there is a linking error: /usr/bin/ld: collectsensresults.o: in function `CollectSensResults._omp_fn.0': collectsensresults.c:(.text+0xb3): undefined reference to `GOMP_loop_nonmonotonic_dynamic_star...
by Antti Rintala
Wed May 13, 2020 7:35 am
Forum: Bugs, problems, questions & feeback
Topic: Transport cycle freezing
Replies: 6
Views: 547

Re: Transport cycle freezing

So by freezing you mean that the calculation takes a lot of time every 20 cycles? The B1/P1/FM calculation selected with the set fum card is by default run on every 20 cycles. With a lot of micro/multi-energy groups the calculation may take a lot of time, especially with the original/old B1 method. ...
by Antti Rintala
Mon Feb 24, 2020 8:41 am
Forum: Users
Topic: Kappa and Nu Fission Tally not working
Replies: 1
Views: 282

Re: Kappa and Nu Fission Tally not working

Kappafission or nufission is currently not supported by the micro depletion routines. Note also that in the next Serpent update, there will be some major changes in the micro depletion related stuff.
by Antti Rintala
Tue Dec 03, 2019 2:52 pm
Forum: Users
Topic: Memory usage for burnup calculations
Replies: 7
Views: 905

Re: Memory usage for burnup calculations

The burnup matrixes are stored in a compressed sparse column sparse matrix format, therefore having two vectors of size nnz (one complex and one long) and one vector of size n (long), where nnz is the number of non zero entries in the burnup matrix (reactions, decays, fission yields) and n is the nu...
by Antti Rintala
Mon Nov 18, 2019 8:53 am
Forum: General
Topic: Odd error message
Replies: 1
Views: 980

Re: Odd error message

It's trying to say that there is a zero infinite spectrum few-group flux in some energy group in a universe where Serpent is trying to calculate CMM diffusion coefficients, thus causing the CMM diffusion coefficients to fail. The warning message is already made to make some more sense in the next re...