Persistent Link:
http://hdl.handle.net/10150/186554
Title:
Coupled electron/photon S(N) calculation in lattice geometry.
Author:
Hadad, Kamal.
Issue Date:
1993
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The capabilities of the coupled charged/neutral particle transport S(N) code SMARTEPANTS (Simulating Many Accumulative Rutherford Trajectories Electron Photon and Neutral Transport Solver) have been extended from x-y-z geometry to x-y-z geometry with embedded cylinders. A new method called the super-cell algorithm was applied to accommodate cylindrical shapes using a rectangular mesh. The super-cell is defined as a rectangular mesh cell containing one or more material interfaces. Each material region within a super-cell constitutes a sub-cell. To model cylindrical shapes, curved sub-cell interfaces were used. The critical aspect of the super-cell method was to determine the angular fluxes in a sub-cell within the super-cell. To do this, the super-cells were divided into two major categories, Type-1 and Type-2. The cylinder's radius compared to the super-cell's mesh size was used as a basis to distinguish the super-cell's type. Each type was divided into several sub-cases depending on the direction cosine of the angular flux when entering the super-cell. The super-cell method was integrated into SMARTEPANTS and then used to calculate the energy deposition for a variety of test problems to check the method's sensitivity to its parameters. For a block of galium-arsenide (Ga-As) with an embedded gold cylinder, it was found that an S₈ quadrature set with a five energy groups is both time efficient and yields satisfactory results. The effect of cylinder radius compared to the mesh size in Type-2 super-cells was found to be minimum for an optimum mesh size. Several benchmark problems were performed to compare the super-cells results with coupled electron/photon Monte Carlo code (ITS). The total energy deposition in the peak energy cell was selected to facilitate the comparison. Peak energy cell is the cell with the maximum energy deposition. For an isotropic electron source in a Ga-As block embedded with Type-1 and Type-2 gold cylinders the results were within 3% and 6% respectively and SMARTEPANTS results in the non-super-cells were more symmetric than Monte Carlo. Super-cell also demonstrated better computer efficiency both in CPU time and memory when compared with the Monte Carlo method on the same machine.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Dissertations, Academic.; Nuclear engineering.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Nuclear and Energy Engineering; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Filippone, William

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleCoupled electron/photon S(N) calculation in lattice geometry.en_US
dc.creatorHadad, Kamal.en_US
dc.contributor.authorHadad, Kamal.en_US
dc.date.issued1993en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThe capabilities of the coupled charged/neutral particle transport S(N) code SMARTEPANTS (Simulating Many Accumulative Rutherford Trajectories Electron Photon and Neutral Transport Solver) have been extended from x-y-z geometry to x-y-z geometry with embedded cylinders. A new method called the super-cell algorithm was applied to accommodate cylindrical shapes using a rectangular mesh. The super-cell is defined as a rectangular mesh cell containing one or more material interfaces. Each material region within a super-cell constitutes a sub-cell. To model cylindrical shapes, curved sub-cell interfaces were used. The critical aspect of the super-cell method was to determine the angular fluxes in a sub-cell within the super-cell. To do this, the super-cells were divided into two major categories, Type-1 and Type-2. The cylinder's radius compared to the super-cell's mesh size was used as a basis to distinguish the super-cell's type. Each type was divided into several sub-cases depending on the direction cosine of the angular flux when entering the super-cell. The super-cell method was integrated into SMARTEPANTS and then used to calculate the energy deposition for a variety of test problems to check the method's sensitivity to its parameters. For a block of galium-arsenide (Ga-As) with an embedded gold cylinder, it was found that an S₈ quadrature set with a five energy groups is both time efficient and yields satisfactory results. The effect of cylinder radius compared to the mesh size in Type-2 super-cells was found to be minimum for an optimum mesh size. Several benchmark problems were performed to compare the super-cells results with coupled electron/photon Monte Carlo code (ITS). The total energy deposition in the peak energy cell was selected to facilitate the comparison. Peak energy cell is the cell with the maximum energy deposition. For an isotropic electron source in a Ga-As block embedded with Type-1 and Type-2 gold cylinders the results were within 3% and 6% respectively and SMARTEPANTS results in the non-super-cells were more symmetric than Monte Carlo. Super-cell also demonstrated better computer efficiency both in CPU time and memory when compared with the Monte Carlo method on the same machine.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectDissertations, Academic.en_US
dc.subjectNuclear engineering.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineNuclear and Energy Engineeringen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairFilippone, Williamen_US
dc.contributor.committeememberGanapol, Barryen_US
dc.contributor.committeememberHetrick, Daviden_US
dc.contributor.committeememberSecker, Phillip A. Jr.en_US
dc.identifier.proquest9421761en_US
dc.identifier.oclc721969995en_US
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