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- W2079810844 abstract "Abstract The one group finite element formulation of the neutron transport equation is adapted to treat multigroup shielding problems. The method is extended to eigenvalue problems by using a source iteration technique. The results for one-dimensional two group shielding problems show that the finite element method is fast and accurate; in the case of transport problems the solutions are free from the ray defects often found with discrete ordinate methods. Results for eigenvalue problems show that the method, when compared with discrete ordinate and collision probability methods and with diffusion theory in appropriate cases, is again fast and accurate. In the majority of cases, approximate values of the lowest eigenvalue when plotted against the reciprocal of the square number of nodes, lie very close to a straight line; consequently a very good estimate of the benchmark eigenvalue can often be found with coarse finite element methods. The results for two group problems have shown that the accuracy and speed achieved for the corresponding one group benchmark problems are maintained. These results and those of Part III, for the two-dimensional two region one group problems indicate that the finite element method is promising for the multigroup two dimensional problems. For both sets of results the finite element representation is used for the spatial dependence of the angular flux. The directional dependence of the angular flux is treated by expansions: either the Spherical Harmonics, the continuous representation; or Walsh Functions, the discrete representation. Walsh Functions do not appear to have any particular advantage over Spherical Harmonics. In the case of one dimension when the Spherical Harmonics reduce to Legendre functions, they are superior to Walsh Functions." @default.
- W2079810844 created "2016-06-24" @default.
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- W2079810844 title "A finite element method for neutron transport. Part IV: A comparison of some finite element solutions of two group benchmark problems with conventional solutions" @default.
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- W2079810844 doi "https://doi.org/10.1016/0306-4549(80)90020-1" @default.
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