## Search found 73 matches

Wed Mar 16, 2016 4:50 pm
Forum: Users
Topic: Net Surface Current for 1D problem
Replies: 15
Views: 6985

### Re: Net Surface Current for 1D problem

Here is a better explanation about my model: http://s23.postimg.org/gbaapyxzv/1_D_Radial_Reflector_Model_i_Modified.png My model lattice is defined as: % <u0> <type> <x0> <y0> <nx> <ny> <p> Lat CORE 1 0.0 0.0 11 1 21.504 % (Fuel Assembly Pitch = 21.504 cm) 1111111 FA_B_13 FA_B_14 FA_C_09 FA_C_10 FA_...
Wed Mar 16, 2016 1:21 pm
Forum: Users
Topic: Net Surface Current for 1D problem
Replies: 15
Views: 6985

### Re: Net Surface Current for 1D problem

I have another question: Does the built-in diffusion flux solver works for non-fissile universes? The reason for asking such a question is that I had the warning message (Negative values in homogeneous flux solution) when I included the left reflector node (blue color in my model) in the adf calcula...
Wed Mar 16, 2016 10:22 am
Forum: Users
Topic: Net Surface Current for 1D problem
Replies: 15
Views: 6985

### Re: Net Surface Current for 1D problem

What I understood initially is that the order of net surface current is as the following:

W1-S1-E1-N1-W2-S2-E2-N2
Where the index 1 and 2 refer to fast and thermal energy group, respectively.

But the order turns to be:
W1-W2-S1-S2-E1-E2-N1-N2

Thanks Jaakko for the clarification.
Tue Mar 15, 2016 6:54 pm
Forum: Users
Topic: Net Surface Current for 1D problem
Replies: 15
Views: 6985

### Net Surface Current for 1D problem

Dear Jaakko, I developed a model as presented below in order to generated ADF for each universe (such as universe 1 in the picture below). In this model, I set boundary condition to be as (set bc 1 2 2). http://s7.postimg.org/yzvgztozv/1_D_Radial_Reflector_Model_i_geom1.png In the output, I had the ...
Tue Mar 15, 2016 12:02 pm
Forum: Users
Topic: True Variance Estimation
Replies: 1
Views: 1889

### True Variance Estimation

Dear Jaakko,

As it is well known with MC k-eigenvalue calculation that the sample variance tends to be smaller than its true variance due to intercycle correlations of the fission source distribution.

Does Serpent internally implement any methods to estimate the true variance?
Tue Mar 15, 2016 11:34 am
Forum: Users
Topic: Warning: Negative values in homogeneous flux solution
Replies: 17
Views: 7818

### Re: Warning: Negative values in homogeneous flux solution

Dear Jaakko, In the output file hflx.m, what do f1 and f2 refer to? FYI, I had positive values for all f2 and negative values for all f1. And, I did not have the warning message: Negative values in homogeneous flux solution. I guess one for surface homogenous flux and the other for corner homogenous...
Mon Mar 14, 2016 7:08 pm
Forum: Users
Topic: Serpent 2.1.25 Convergence Test
Replies: 6
Views: 3542

### Re: Serpent 2.1.25 Convergence Test

Thanks Jaakko not only for your quick response, but also for your effective communication.
Mon Mar 14, 2016 3:41 pm
Forum: Users
Topic: New options for set pcc
Replies: 5
Views: 4106

### Re: New options for set pcc

I added these changes to my previous post.
Thanks
Mon Mar 14, 2016 3:29 pm
Forum: Users
Topic: Serpent 2.1.25 Convergence Test
Replies: 6
Views: 3542

### Re: Serpent 2.1.25 Convergence Test

Thank you Jaakko. I understood what you explained earlier that: - 1st column: Cycle number. - 2nd column: Cycle-wise value. - 3rd column: Cumulative mean. - 4th column: Cumulative relative statistical error. Out of curiosity, what about HIS_ANA_KEFF (10 columns) and HIS_TRANSPORT_RUNTIME (7 columns)...
Mon Mar 14, 2016 3:14 pm
Forum: Users
Topic: New options for set pcc
Replies: 5
Views: 4106

### Re: New options for set pcc

Thank you Jaakko. So, there are six available options in Serpent for burnup calculation using "set pcc": Predictor only: 1) Constant Extrapolation (set pcc CE) (equivalent to set pcc 0). 2) Linear Extrapolation (set pcc LE). Predictor/Corrector: 1) Constant Extrapolation / Linear Interpolation (set ...