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Two-dimensional finite element neutronics steady-state calculation method based on icem-cfd

A technology of ICEM-CFD and calculation method, which is applied in the field of ICEM-CFD-based two-dimensional finite element neutronics steady-state calculation, can solve the problems of non-universality, complex geometry of reactor core, and difficulty in realizing real geometric description, etc. , to achieve the effect of improving computing power, computing accuracy, and practical engineering value

Active Publication Date: 2022-03-18
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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Problems solved by technology

The current mainstream two-dimensional neutronics steady-state calculation method for reactors is based on the finite difference method or the finite element method of manual meshing to deal with the reactor core geometry, but the actual reactor core geometry is extremely complex, and the finite difference of the structured grid is used method or the finite element method of manual meshing are spatially difficult to achieve a realistic geometric description
However, most of these programs use manual methods for geometric subdivision, which makes the geometric processing modules of finite element programs in this era inevitably have disadvantages such as complicated mesh processing and lack of versatility.

Method used

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  • Two-dimensional finite element neutronics steady-state calculation method based on icem-cfd
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  • Two-dimensional finite element neutronics steady-state calculation method based on icem-cfd

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Embodiment 1

[0041] In this embodiment, triangular elements are used to perform two-dimensional finite element neutronics steady-state calculation based on ICEM-CFD.

[0042] 1. Use the CAD pre-processing software ICEM-CFD to divide the geometry of the two-dimensional core into triangular or quadrilateral meshes, define each component of the two-dimensional core as a part, and give the part a material required for neutronics calculations No., prepare the neutronics section parameters according to the material number.

[0043] Establish the geometric model of the two-dimensional core in ICEM-CFD, divide the core into a triangular grid, and output the grid in the grid file format of LS-Dyna, and divide the grid into a surface grid in the two-dimensional steady-state calculation and line meshes, where surface meshes are identified as ELEMENT_SHELL in ICEM-CFD output files and line meshes are identified as ELEMENT_BEAM in ICEM-CFD output files. Area meshes are triangles and line meshes are li...

Embodiment 2

[0084] In this embodiment, a quadrilateral element is used to perform two-dimensional finite element neutronics steady-state calculation based on ICEM-CFD.

[0085] 1. Use the CAD pre-processing software ICEM-CFD to divide the geometry of the two-dimensional core into triangular or quadrilateral meshes, define each component of the two-dimensional core as a part, and give the part a material required for neutronics calculations No., prepare the neutronics section parameters according to the material number.

[0086] Establish the geometric model of the two-dimensional core in ICEM-CFD, divide the core into a quadrilateral grid, and output the grid in the grid file format of LS-Dyna, and divide the grid into a surface grid in the two-dimensional steady-state calculation and line meshes, where surface meshes are identified as ELEMENT_SHELL in ICEM-CFD output files, and line meshes are identified as ELEMENT_BEAM in ICEM-CFD output files. Area meshes are quadrilaterals, and line ...

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Abstract

The invention discloses a two-dimensional finite element neutronics steady-state calculation method based on ICEM-CFD. The two-dimensional finite element neutronics steady-state calculation method based on ICEM-CFD of the present invention utilizes the CAD pre-processing software ICEM-CFD to perform triangular or quadrilateral mesh division on the two-dimensional core geometry, and establishes two-dimensional neutronics steady-state For finite element equations, the nodes are discretized on the grid and the discrete node equations are established, the coefficient matrix is ​​assembled, and the overall equation is numerically calculated to obtain the reactor steady-state neutronics parameters under the current geometry and material arrangement. The two-dimensional finite element neutronics steady-state calculation method based on ICEM-CFD of the present invention improves the calculation ability and calculation accuracy of two-dimensional neutronics, has good adaptability to complex core geometry, and has more practical engineering value .

Description

technical field [0001] The invention belongs to the field of nuclear reactor engineering, and in particular relates to a two-dimensional finite element neutronics steady-state calculation method based on ICEM-CFD. Background technique [0002] The current mainstream two-dimensional neutronics steady-state calculation method for reactors is based on the finite difference method or the finite element method of manual meshing to deal with the reactor core geometry, but the actual reactor core geometry is extremely complex, and limited Neither the difference method nor the finite element method with manual meshing is spatially difficult to achieve a true geometric description. [0003] The finite element method has been applied and popularized in the field of neutronics calculations since the 1960s because of its unstructured grid subdivision ability and can adapt to any geometry. Programs such as 3DFEMJS, TFEM-2D, and FEM2D-655 have been developed in China. , foreign countries...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F111/10
CPCG06F30/23
Inventor 袁宝新郑杰杨万奎张松宝
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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