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Developing 3D neutron transport kernel for heterogeneous structures in an improved method of characteristic (MOC) framework

Porhemmat, M. H ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.pnucene.2020.103442
  3. Publisher: Elsevier Ltd , 2020
  4. Abstract:
  5. Given the importance and complexity of the three-dimensional (3D) neutron transport equation solution, in the current research, a new Modular Ray Tracing (MRT) Algorithm and 3D characteristic kernel for heterogeneous structures are presented. Improvement of memory management and cache coherency are achieved to some acceptable level. Also, parallel implementation of transport algorithm utilizing OpenMP, cause significant reduction in runtime. To validate our Algorithm, first, a self-constituted pin cell and a lattice arrangement are modeled and results are compared with Monte-Carlo simulation. Second, the well-known 3D benchmark, Takeda model one and two, are investigated and results compared with the well-known MPACT code. Also, as a reliable trial, the obtained multiplication factors from the forward and adjoint form of MOC kernel are investigated. Meanwhile, for the multiplication factor, we achieved 3.5800E-04 and 3.3924E-04 [Formula presented] the difference with Takeda reference models one and two respectively. Also, the maximum speedup that our parallel algorithm gained for the Takeda benchmark is 5.13. © 2020 Elsevier Ltd
  6. Keywords:
  7. 3D MOC kernel ; Modular Ray Tracing ; Parallel neutron transport ; Takeda benchmark ; Application programming interfaces (API) ; Neutron flux ; Transport properties ; Heterogeneous structures ; Lattice arrangements ; Method of characteristics ; Multiplication factor ; Neutron transport equation ; Parallel implementations ; Threedimensional (3-d) ; Transport algorithms ; Monte Carlo methods
  8. Source: Progress in Nuclear Energy ; Volume 127 , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0149197020301943