Consistent energy treatment for radiation transport methods

dc.contributor.advisor Rahnema, Farzad
dc.contributor.author Douglass, Steven James en_US
dc.contributor.committeeMember Lubinsky, Doron
dc.contributor.committeeMember Morley, Tom
dc.contributor.committeeMember Petrovic, Bojan
dc.contributor.committeeMember Zhang, Dingkang
dc.contributor.department Nuclear Engineering en_US
dc.date.accessioned 2013-06-15T02:45:43Z
dc.date.available 2013-06-15T02:45:43Z
dc.date.issued 2012-03-30 en_US
dc.description.abstract A condensed multigroup formulation is developed which maintains direct consistency with the continuous energy or fine-group structure, exhibiting the accuracy of the detailed energy spectrum within the coarse-group calculation. Two methods are then developed which seek to invert the condensation process turning the standard one-way condensation (from fine-group to coarse-group) into the first step of a two-way iterative process. The first method is based on the previously published Generalized Energy Condensation, which established a framework for obtaining the fine-group flux by preserving the flux energy spectrum in orthogonal energy expansion functions, but did not maintain a consistent coarse-group formulation. It is demonstrated that with a consistent extension of the GEC, a cross section recondensation scheme can be used to correct for the spectral core environment error. A more practical and efficient new method is also developed, termed the "Subgroup Decomposition (SGD) Method," which eliminates the need for expansion functions altogether, and allows the fine-group flux to be decomposed from a consistent coarse-group flux with minimal additional computation or memory requirements. In addition, a new whole-core BWR benchmark problem is generated based on operating reactor parameters in 2D and 3D, and a set of 1D benchmark problems is developed for a BWR, PWR, and VHTR core. en_US
dc.description.degree PhD en_US
dc.identifier.uri http://hdl.handle.net/1853/47612
dc.publisher Georgia Institute of Technology en_US
dc.subject Neutron transport theory en_US
dc.subject Subgroup decomposition en_US
dc.subject Cross section condensation en_US
dc.subject Consistent multigroup method en_US
dc.subject.lcsh Radiative transfer
dc.subject.lcsh Transport theory
dc.title Consistent energy treatment for radiation transport methods en_US
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Rahnema, Farzad
local.contributor.corporatename George W. Woodruff School of Mechanical Engineering
local.contributor.corporatename College of Engineering
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relation.isOrgUnitOfPublication c01ff908-c25f-439b-bf10-a074ed886bb7
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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