Closed paulromano closed 12 years ago
With the latest commit, I now get the following results (10000 particles per cycle, 10 inactive, 3000 total):
============================> TALLY 1 <============================
Mesh Index (1, 1, 1)
Total Reaction Rate 3.38046 +/- 6.50331E-04
Scattering Rate 2.72691 +/- 5.35790E-04
Scattering Production Rate 2.72922 +/- 6.42279E-04
Absorption Rate 0.653550 +/- 1.16532E-04
Fission Rate 0.609447 +/- 1.05189E-04
Nu-Fission Rate 1.76583 +/- 2.98909E-04
============================> TALLY 2 <============================
Mesh Index (1, 1, 1)
Outgoing Current to Left 0.174854 +/- 5.74593E-04
Incoming Current from Left 0.0 +/- 0.0
Incoming Current from Right 0.0 +/- 0.0
Outgoing Current to Right 0.174877 +/- 6.15736E-04
Outgoing Current to Back 0.0 +/- 0.0
Incoming Current from Back 0.0 +/- 0.0
Incoming Current from Front 0.0 +/- 0.0
Outgoing Current to Front 0.0 +/- 0.0
Outgoing Current to Bottom 0.0 +/- 0.0
Incoming Current from Bottom 0.0 +/- 0.0
Incoming Current from Top 0.0 +/- 0.0
Outgoing Current to Top 0.0 +/- 0.0
Plugging this into Python with the uncertainties module, it looks like neutron balance is ok:
In [1]: from uncertainties import ufloat
In [2]: total = ufloat((3.38046,6.50331e-4))
In [3]: nuscatter = ufloat((2.72922,6.42279e-4))
In [4]: leak_left = ufloat((0.174854,5.74593e-4))
In [5]: leak_right = ufloat((0.174877,6.15736e-4))
In [6]: leak_left + leak_right + total - nuscatter
Out[6]: 1.0009709999999994+/-0.0012428759635406102
Running Bryan's problem of a 50cm x 20cm x 20cm box, reflective boundary conditions in y and z, and a single mesh cell that covers the geometry. There are two problems with the reported results:
The results are: