Search found 88 matches

by gavin.ridley.utk
Tue Mar 27, 2018 12:03 am
Forum: Gamma transport
Topic: Anyone test in 2.1.30 yet?
Replies: 9
Views: 3964

Anyone test in 2.1.30 yet?

Hey folks, I'm having some trouble running coupled n, gamma calculations in version 2.1.30. When not using MPI, stuff seems to work in 2.1.29. I can present an offending input file if whichever developer who decides to check this out can't reproduce the issue with whatever simple examples you all ha...
by gavin.ridley.utk
Wed Mar 21, 2018 8:20 pm
Forum: Bugs, problems, questions & feeback
Topic: A fix for a pointer error from unused reprocessors
Replies: 0
Views: 1051

A fix for a pointer error from unused reprocessors

Hi Serpent folks, It seems that a pointer error occurs if mass flows get set up for continuous reprocessing, but the reprocessing is not done over depletion. An example input file can be found below, which gives the error in 2.1.30. Notice, mflows exist but the reprocessor isn't used. By the way, th...
by gavin.ridley.utk
Tue Mar 06, 2018 5:00 am
Forum: Bugs, problems, questions & feeback
Topic: Why no corrector steps in contin. repro. calcs?
Replies: 2
Views: 1267

Re: Why no corrector steps in contin. repro. calcs?

Correction: this does not interpolate XS, so it would act as a single implicit step iteration.
by gavin.ridley.utk
Sun Mar 04, 2018 11:20 pm
Forum: Bugs, problems, questions & feeback
Topic: Why no corrector steps in contin. repro. calcs?
Replies: 2
Views: 1267

Re: Why no corrector steps in contin. repro. calcs?

Well, for anyone interested, here's a patch to 2.1.30 that should enable predictor-corrector in continuous reprocessing calculations. No substepping, but this may be helpful for anyone looking at thermal MSR with possible addition of burnable poisons resulting in quick spectral changes that would be...
by gavin.ridley.utk
Mon Feb 12, 2018 9:31 pm
Forum: Bugs, problems, questions & feeback
Topic: Why no corrector steps in contin. repro. calcs?
Replies: 2
Views: 1267

Why no corrector steps in contin. repro. calcs?

Hey all (this is probably just a question for Jaakko), From the get-go of the MSR continuous reprocessing ability, corrector steps have been unavailable in MSR calculations. Well, why can't corrector be used for molten salt stuff? I understand this was to simplify the coding efforts. Is this because...
by gavin.ridley.utk
Sun Dec 31, 2017 12:30 am
Forum: Bugs, problems, questions & feeback
Topic: Moment-weighted removal XS?
Replies: 0
Views: 867

Moment-weighted removal XS?

Hi all, I'm looking into adding SP_n neutronics to a simple deterministic code. These equations require the higher spherical harmonic weighted group to group scattering matrices, which Serpent seems to provide, up to the seventh moment in the INF_SP<n> variables. How can higher moment removal cross ...
by gavin.ridley.utk
Sun Nov 26, 2017 9:56 pm
Forum: Bugs, problems, questions & feeback
Topic: -mix only prints if mixture used in geometry
Replies: 1
Views: 1469

-mix only prints if mixture used in geometry

Hi Serpent folks, I recently noticed something that isn't exactly a fatal bug, but is somewhat an inconvenience. It seems that in version 2.1.29 if mixtures are not used in geometry, they do not get calculated upon using -mix. For instance: Using this geometry with a mixture present: cell 1 0 fuel -...
by gavin.ridley.utk
Mon Sep 04, 2017 8:44 pm
Forum: Bugs, problems, questions & feeback
Topic: Void Reactivity Coefficient Sensitivity Calculations
Replies: 3
Views: 2097

Re: Void Reactivity Coefficient Sensitivity Calculations

Hey Ville, Why would someone use the approach you just mentioned as opposed to: sens resp void MATERIAL found on the forum? You mean to say that sensitivity of void coefficient gets calculated but not void coefficient itself? Or is it just not reported in output? Additionally, I think that something...
by gavin.ridley.utk
Mon Jul 10, 2017 10:25 pm
Forum: Bugs, problems, questions & feeback
Topic: Diffcoefed.c? a new way to calculate diffusion coefficients?
Replies: 3
Views: 3587

Re: Diffcoefed.c? a new way to calculate diffusion coefficients?

Oh... it looks like I was accidentally having my code read the transpose of the group transfer XS matrix... :lol:

Things seem a lot more reasonable now.
by gavin.ridley.utk
Mon Jul 10, 2017 5:46 pm
Forum: Bugs, problems, questions & feeback
Topic: Diffcoefed.c? a new way to calculate diffusion coefficients?
Replies: 3
Views: 3587

Re: Diffcoefed.c? a new way to calculate diffusion coefficients?

Well, I have tried both the INF and B1-corrected diffusion coefficient, but both aren't seeming to do the trick. The group constants are generate in two infinite universes, one for each fuel salt and graphite. The two universes are used to fill salt channels or moderator in a square lattice that mak...