Search found 88 matches

by gavin.ridley.utk
Mon Jul 10, 2017 7:59 am
Forum: Bugs, problems, questions & feeback
Topic: Diffcoefed.c? a new way to calculate diffusion coefficients?
Replies: 3
Views: 3587

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

Hi all (probably particularly Mr. Leppanen), A colleague and I are having terrible troubles making Serpent 2 group constants give a reasonable eigenvalue in our diffusion code. Running our code with GCs from a code like NEWT in the SCALE package gives group constants with very reasonable, near corre...
by gavin.ridley.utk
Mon Jul 10, 2017 4:47 am
Forum: Bugs, problems, questions & feeback
Topic: Clarification on some parameters in branching output
Replies: 4
Views: 3238

Re: Clarification on some parameters in branching output

Ah, OK, I thought this was the case, but just wanted to double check! Thanks!
by gavin.ridley.utk
Wed Jul 05, 2017 10:25 pm
Forum: Bugs, problems, questions & feeback
Topic: Clarification on some parameters in branching output
Replies: 4
Views: 3238

Re: Clarification on some parameters in branching output

Thanks for the link! As for the "precursors" part, I meant that in reference to the BETA_EFF and LAMBDA parameters. If it were fission spectrum, it would have made more sense to me that the last values are zero, but this isn't chi.
by gavin.ridley.utk
Wed Jul 05, 2017 7:55 pm
Forum: Bugs, problems, questions & feeback
Topic: Clarification on some parameters in branching output
Replies: 4
Views: 3238

Clarification on some parameters in branching output

Hi all, I am generating group constants at a few state points using the branch syntax. There are a few parameters I'm confused on. <INF/B1>_CHI<T/P/D> : This is chi(E) for "total", "production" (accomodating the effects of (n,xn) reactions?) and ... I'm not sure what CHID may stand for. For precurso...
by gavin.ridley.utk
Sun Jul 02, 2017 9:26 pm
Forum: Bugs, problems, questions & feeback
Topic: Branch input for universe transformations
Replies: 7
Views: 10639

Re: Branch input for universe transformations

Ah, I see now. I had two input files: one to perturb the moderator temperature at five CR positions, and another to perturb the fuel temperature. I just didn't fix the moderator CR universe transformations. So, really, the error was caused by having this line below it: branch rod0 tra CR1 208.0 Than...
by gavin.ridley.utk
Sat Jul 01, 2017 11:57 pm
Forum: Bugs, problems, questions & feeback
Topic: Branch input for universe transformations
Replies: 7
Views: 10639

Re: Branch input for universe transformations

I generated the input with a script, so I'm doubtful of a typo, haha. Here is all what I gave serpent: branch moder0 stp moder -1.8697009302433254 633.0 grmod gre7.12t gre7.16t branch moder1 stp moder -1.8674474300551962 700.0 grmod gre7.16t gre7.16t branch moder2 stp moder -1.864089048131591 800.0 ...
by gavin.ridley.utk
Fri Jun 30, 2017 10:39 pm
Forum: Bugs, problems, questions & feeback
Topic: [reprocessing] Nonconservation of mass in type 2 flows
Replies: 7
Views: 20674

Re: [reprocessing] Nonconservation of mass in type 2 flows

Ah, OK, this makes a lot of sense now. I'm very thankful for this help. Seems like it may be the case that for problems like this, maybe a type 2 flow from source to refl, then type 1 from refl to sink would be most appropriate.

Have a nice day! :D
by gavin.ridley.utk
Fri Jun 30, 2017 10:28 pm
Forum: Bugs, problems, questions & feeback
Topic: Branch input for universe transformations
Replies: 7
Views: 10639

Re: Branch input for universe transformations

One more thing: I am trying to change the temperature of a moderator with: branch moder1 stp moder -1.8674474300551962 700.0 grmod gre7.16t gre7.16t The material in question is: mat moder -1.86 rgb 128 128 128 moder grmod 6000 5010.09c -1.592e-5 5011.09c -6.408e-5 23000.09c -0.0009 16000.09c -0.0005...
by gavin.ridley.utk
Fri Jun 30, 2017 6:43 pm
Forum: Bugs, problems, questions & feeback
Topic: Branch input for universe transformations
Replies: 7
Views: 10639

Re: Branch input for universe transformations

This seems to work well! Thanks!! :D