Search found 381 matches

by Ville Valtavirta
Wed Mar 11, 2020 11:52 am
Forum: Users
Topic: Detector reading
Replies: 3
Views: 88

Re: Detector reading

I'm sorry, why are you not actually using decay mode for the simulation?

If you explicitly want to do burnup instead of decay, I would advice using a very low power instead of zero. I.e. something like 1e-6 Watt.

-Ville
by Ville Valtavirta
Mon Mar 09, 2020 10:55 am
Forum: Users
Topic: Cross-section generation questions
Replies: 1
Views: 69

Re: Cross-section generation questions

Hi Vince, Serpent does the group constant generation on universe basis, which means that you can get material-wise homogenized group constants by specifying different materials as different universes. The most simple approach would probably be to create an inf surface and create separate infinite ce...
by Ville Valtavirta
Mon Mar 09, 2020 10:47 am
Forum: Users
Topic: Fatal Error: Insufficient Buffer size
Replies: 7
Views: 224

Re: Fatal Error: Insufficient Buffer size

Hi, I think currently "set dynsrc" automatically switch the emission of delayed neutrons from precursors on so you will probably still have delayed neutrons and Serpent will still track the delayed neutron precursors that were present in the beginning of the simulation. Currently using set dynsrc .....
by Ville Valtavirta
Thu Feb 27, 2020 2:25 pm
Forum: Users
Topic: Fatal Error: Insufficient Buffer size
Replies: 7
Views: 224

Re: Fatal Error: Insufficient Buffer size

This printout is not really alarming.

Can you try simulating a single time-interval of a smaller length (e.g. 1e-5 seconds) and then slowly move to longer simulation times once everything works with a short time.

-Ville
by Ville Valtavirta
Tue Feb 25, 2020 11:43 am
Forum: Bugs, problems, questions & feeback
Topic: Time dependence in external source
Replies: 13
Views: 2684

Re: Time dependence in external source

It works but not for multiple energy groups. I had an option in the Matlab code to generate 'm' number of point sources with different energies at the same location. And when I do that, I'm back to the same problem :( Sorry, I'm not sure I understand, which problem? Could you tell more about what y...
by Ville Valtavirta
Tue Feb 25, 2020 10:59 am
Forum: Users
Topic: Diffusion Coefficients at Different Reactor Regions
Replies: 3
Views: 131

Re: Diffusion Coefficients at Different Reactor Regions

Hi, the INF_DIFFCOEF is based on the out-scatter approximation that can be applied separately at the sub regions. However, the out-scatter approximation itself does not give the best diffusion coefficients. B1_DIFFCOEF is the leakage corrected diffusion coefficient and as you are not generating diff...
by Ville Valtavirta
Mon Feb 24, 2020 11:31 am
Forum: Bugs, problems, questions & feeback
Topic: Time dependence in external source
Replies: 13
Views: 2684

Re: Time dependence in external source

Hi, could you try re-running the simulation with just a single time interval of 100 seconds in the srctime definition? Serpent is probably sampling points from the source file only for the first time interval (and rejecting all points that are after the end of that first interval) and the source for...
by Ville Valtavirta
Mon Feb 24, 2020 11:22 am
Forum: Development
Topic: Angle in plots of vertical sections
Replies: 3
Views: 79

Re: Angle in plots of vertical sections

Hi, you are correct in that this feature does not exist yet. The easiest way to do this is, as you note, to apply a transformation for the whole geometry before plotting. I imagine a general way to implement such a thing would be to have a possibility to link a trans card into a plot card so that th...
by Ville Valtavirta
Mon Feb 24, 2020 11:18 am
Forum: Users
Topic: Diffusion Coefficients at Different Reactor Regions
Replies: 3
Views: 131

Re: Diffusion Coefficients at Different Reactor Regions

Hi, Serpent can evaluate group constants such as homogenized cross sections and diffusion coefficients separately for different universes . You can thus get the data separately for the different regions of a reactor by making the different parts be a different universe. You can consider this already...
by Ville Valtavirta
Mon Feb 24, 2020 11:00 am
Forum: Users
Topic: Photon detector
Replies: 8
Views: 182

Re: Photon detector

Hi, the dr card for Serpent detectors specifies a response function for the detector. If you define multiple response functions, you will get multiple results, one for each response. I would imagine you would want to use one of the responses for the photon dose rate found here: http://serpent.vtt.fi...