COMPARISONS AMONG THREE COUPLING FORMS OF CYLINDRICAL NODAL EXPANSION METHODS [PDF]
EPJ Web of Conferences, 2021 Nodal expansion method (NEM) is a typical nodal method in solving neutron diffusion equation in coarse mesh spatial discretization. NEM has been extended to cylindrical geometry in previous studies.
Wen Yutong, She Ding, Shi Lei, Zhao Jing
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Jacobian-free Newton Krylov two-node coarse mesh finite difference based on nodal expansion method
Nuclear Engineering and Technology, 2022 A Jacobian-Free Newton Krylov Two-Nodal Coarse Mesh Finite Difference algorithm based on Nodal Expansion Method (NEM_TNCMFD_JFNK) is successfully developed and proposed to solve the three-dimensional (3D) and multi-group reactor physics models.
Xiafeng Zhou
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Second order of average current nodal expansion method for the neutron noise simulation
Nuclear Engineering and Technology, 2021 The aim of this work is to prepare a neutron noise calculator based on the second order of average current nodal expansion method (ACNEM). Generally, nodal methods have the ability to fulfill the neutronic analysis with adequate precision using coarse ...
N. Poursalehi, A. Abed
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Expansion of the Nodal-Adjoint Method for Simple and Efficient Computation of the 2D Tomographic Imaging Jacobian Matrix [PDF]
Sensors, 2021 This paper focuses on the construction of the Jacobian matrix required in tomographic reconstruction algorithms. In microwave tomography, computing the forward solutions during the iterative reconstruction process impacts the accuracy and computational ...
Samar Hosseinzadegan +4 more
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The HEXNEM3 nodal flux expansion method for the hexagonal geometry in the code DYN3D
Annals of Nuclear Energy, 2018 Abstract This paper describes the derivation of the nodal flux expansion method HEXNEM3, its implementation into the nodal diffusion code DYN3D and the corresponding testing versus benchmarks. As in the earlier versions of expansion method HEXNEM1 and HEXNEM2, the neutron flux in a hexagonal node is expanded into superposition of orthogonal ...
Soeren Kliem +2 more
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Nodal Expansion Method for Solution of Diffusion Equation in Hexagonal Geometry
Journal of Nuclear Science and Technology, 1989 KOYAMA, Jun'ichi, AOYAMA, Motoo
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Three-dimensional time-dependent neutron diffusion simulation using average current nodal expansion method [PDF]
Nuclear Technology and Radiation Protection, 2020 In this work, the average current nodal expansion method was developed for the time-dependent neutronic simulation of transients in a nuclear reactor's core.
Valavi Kambiz +2 more
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IMPROVEMENT TO NEM SP3 MODELLING AND SIMULATION [PDF]
EPJ Web of Conferences, 2021 Accurate reactor core steady state safety analysis requires coupling between thermal-hydraulics and three dimensional multigroup pin by pin neutronics.
Xu Yuchao, Hou Jason, Ivanov Kostadin N.
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New 3D Diffusion Code Based on The Nodal Polynomial Expansion
Brazilian Journal of Radiation Sciences, 2021 Nodal Expansion Method (NEM) is widely employed in the neutronic design of nuclear reactors core. The main reason is its higher computational performance and efficiency when compared with the conventional fine mesh difference method or finite element ...
Jadna Mara Santos Mendes +2 more
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Energies, 2021 The Simplified Spherical Harmonic (SPN) approximation was first introduced as a three-dimensional (3D) extension of the plane-geometry Spherical Harmonic (PN) equations.
Yuchao Xu, Jason Hou, Kostadin Ivanov
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