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Time Dependent Discrete Ordinates Neutron Transport Using Distribution Iteration in XYZ Geometry

Time Dependent Discrete Ordinates Neutron Transport Using Distribution Iteration in XYZ Geometry

Hardcover

Technology & EngineeringGeneral MathematicsPhysics

ISBN10: 1025134737
ISBN13: 9781025134734
Publisher: Hutson Street Press
Published: May 22 2025
Pages: 148
Weight: 0.85
Height: 0.38 Width: 6.14 Depth: 9.21
Language: English

The DI algorithm is an alternative to source iteration that, in our testing, does not require an accelerator. I developed a formal verification plan and executed it to verify the results produced by my code that implemented DI with the above features. A new, matrix albedo, boundary condition treatment was developed and implemented so that infinite-medium benchmarks could be included in the verification test suite. The DI algorithm was modified for parallel efficiency and the prior instability of the refinement sweep was corrected. The testing revealed that DI performed as well or faster than source iteration with DSA and that DI continued to work where DSA failed. Performance did degrade when the diamond-difference (without fixup) spatial quadrature was used. Because diamond-difference is a non-positive spatial quadrature, it can produce nonphysical negative fluxes, particularly in higher dimensions. I developed a new fixup scheme to accommodate the negative fluxes, but it did not improve performance in XYZ geometry when the scattering ratio was near unity.

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Dishaw, James R.

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Physics