Search found 454 matches

by Ville Valtavirta
Tue Jul 20, 2021 10:14 am
Forum: Users
Topic: Fission rate in transient simulations
Replies: 6
Views: 448

Re: Fission rate in transient simulations

Could you explain a bit more about the transient you want to model. What kind of conditions do you want to begin the transient from? What kind of initial distributions do you want to use for delayed neutron precursors? You cannot generate physical initial delayed neutron precursor distributions from...
by Ville Valtavirta
Thu Jul 15, 2021 4:36 pm
Forum: Users
Topic: Fission rate in transient simulations
Replies: 6
Views: 448

Re: Fission rate in transient simulations

Hi, it's probably better to use one of these approaches: http://serpent.vtt.fi/mediawiki/index.php/Dynamic_external_source_simulation_mode http://serpent.vtt.fi/mediawiki/index.php/Transient_simulations The first one if you do not need to concern yourself with the delayed neutron source and the seco...
by Ville Valtavirta
Tue Jul 13, 2021 12:24 pm
Forum: Users
Topic: Where to get KERMA data
Replies: 32
Views: 6735

Re: Where to get KERMA data

The link above seems to be working for me.

-Ville
by Ville Valtavirta
Tue Jul 13, 2021 12:13 pm
Forum: Bug reports
Topic: Transient, group binning of precursor
Replies: 6
Views: 314

Re: Transient, group binning of precursor

Hi, Ana already explained the basic cause of the error, but one way for debugging is to check your <input>.out file. At the beginning of the file, you have the summary of nuclide data included in the calculation. You can check the included nuclides there and there is even a separate flag that is pri...
by Ville Valtavirta
Fri Jul 02, 2021 12:41 pm
Forum: Users
Topic: DBRC and edep mode 3 not possible to be executed at the same time
Replies: 7
Views: 440

Re: DBRC and edep mode 3 not possible to be executed at the same time

Hi,

0K cross sections should not be a problem for photon transport. Which Serpent version are you using?

-Ville
by Ville Valtavirta
Mon Jun 28, 2021 3:25 pm
Forum: Bugs, problems, questions & feeback
Topic: Memory allocation failed in burnup restart
Replies: 9
Views: 507

Re: Memory allocation failed in burnup restart

If you compile with -DDEBUG, the insane value of nnuc should get caught in the CheckValue call (and maybe some other debug check could give you a better idea on what's going wrong).

-Ville
by Ville Valtavirta
Mon Jun 28, 2021 3:20 pm
Forum: Bugs, problems, questions & feeback
Topic: Memory allocation failed in burnup restart
Replies: 9
Views: 507

Re: Memory allocation failed in burnup restart

For the values, let's see. The first is number of elements, which in your case seems pretty nonsensically large. The second is size of each element in bytes. For you this is 72 bytes = 9 doubles or longs per element, which would suggest that the actual failure happens at line 132 of printdepoutput.c...
by Ville Valtavirta
Mon Jun 28, 2021 2:40 pm
Forum: Bugs, problems, questions & feeback
Topic: Memory allocation failed in burnup restart
Replies: 9
Views: 507

Re: Memory allocation failed in burnup restart

Hi Yuri, based on a quick source code check, I imagine this is related to writing the <input>_dep.m file. Because of the way the dep.m file is structured (and the way Serpent writes it) Serpent tries to load in all of the nuclide data for a specific material (all nuclides from all burnups) in memory...
by Ville Valtavirta
Thu May 27, 2021 8:53 am
Forum: Users
Topic: Units and meaning of detector output (mean flux values)
Replies: 2
Views: 274

Re: Units and meaning of detector output (mean flux values)

Hi, since you are not defining any spatial integration limits, your detector will tally over the whole geometry. In order to get an idea of the units for detector output see first the beginning of Chapter 7 in the Serpent manual . Basically, detectors will integrate the chosen response over their sp...
by Ville Valtavirta
Wed May 26, 2021 1:23 pm
Forum: Users
Topic: Optimization mode in dynamic simulations
Replies: 10
Views: 847

Re: Optimization mode in dynamic simulations

So you are running either A total of 0.5 seconds using 10 intervals of 0.05 seconds each OR A total of 0.2 seconds using 4 intervals of 0.05 seconds each Is this correct? In this case the results should be statistically equivalent for the first 0.2 seconds. If there are no feedback effects from coup...