Two-dimensional finite element neutronics stable state calculation method based on ICEM-CFD (The Integrated Computer Engineering and Manufacturing code for Computational Fluid Dynamics)

An ICEM-CFD and calculation method technology, applied in the field of ICEM-CFD-based two-dimensional finite element neutronics steady-state calculation, can solve problems such as difficult to achieve real geometric description, complex geometry of reactor core, and lack of universality

Active Publication Date: 2018-10-23
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 stable state calculation method based on ICEM-CFD (The Integrated Computer Engineering and Manufacturing code for Computational Fluid Dynamics)
  • Two-dimensional finite element neutronics stable state calculation method based on ICEM-CFD (The Integrated Computer Engineering and Manufacturing code for Computational Fluid Dynamics)
  • Two-dimensional finite element neutronics stable state calculation method based on ICEM-CFD (The Integrated Computer Engineering and Manufacturing code for Computational Fluid Dynamics)

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Embodiment 1

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

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

[0043] Establish a two-dimensional core geometric model in ICEM-CFD, divide the core into a triangular grid, and output the grid in the LS-Dyna grid file format. The grid is divided into surface grids in the two-dimensional steady state calculation. And line grids, where surface grids are identified by ELEMENT_SHELL in ICEM-CFD output files, and line grids are identified by ELEMENT_BEAM in ICEM-CFD output files. The surface mesh is triangular, and the line mesh is straight.

[0044] Assign ...

Embodiment 2

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

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

[0086] Establish a two-dimensional core geometric model in ICEM-CFD, divide the core into a quadrilateral grid, and output the grid in the LS-Dyna grid file format. In the two-dimensional steady-state calculation, the grid is divided into surface grids And line grids, where surface grids are identified by ELEMENT_SHELL in ICEM-CFD output files, and line grids are identified by ELEMENT_BEAM in ICEM-CFD output files. The surface mesh is quadrilateral, and the line mesh is straight.

[0087...

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Abstract

The invention discloses a two-dimensional finite element neutronics stable state calculation method based on ICEM-CFD (The Integrated Computer Engineering and Manufacturing code for Computational Fluid Dynamics). The two-dimensional finite element neutronics stable state calculation method based on the ICEM-CFD utilizes CAD pre-processing software ICEM-CFD to carry out triangular or quadrilateralmesh generation on two-dimensional reactor core geometry, a two-dimensional neutronics stable state finite element equation is established, node scattering is carried out on a grid, a discrete node equation is established to assemble a coefficient matrix, and a total equation is subjected to numerical calculation to obtain a reactor stable state neutronics parameter under current geometry and material arrangement. By use of the two-dimensional finite element neutronics stable state calculation method based on the ICEM-CFD, the calculation ability and the calculation accuracy of the two-dimensional neutronics are improved, and the method has good adaptation for the complex reactor core geometry, and has a more practical engineering value.

Description

Technical field [0001] The invention belongs to the field of nuclear reactor engineering, and specifically 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. However, the actual reactor core geometry is extremely complex and the use of structured grids is limited. The difference method or the finite element method of manual meshing is difficult to realize the real geometric description in space. [0003] The finite element method can adapt to any geometry due to its unstructured meshing ability, so it has been gradually applied and popularized in the field of neutronics calculation since the 1960s. Programs such as 3DFEMJS, TFEM-2D, FEM2D-655 have been developed in China , There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
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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