Method for automatically generating hexahedral mesh with boundary layer of reactor fuel assembly

A technology of fuel assembly and tetrahedral grid, which is applied in image data processing, 3D modeling, instruments, etc., can solve problems such as complex geometric model and generation of hexahedral grid with boundary layer, so as to reduce operation steps and work Quantity, the effect of improving work efficiency

Active Publication Date: 2019-07-12
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] The object of the present invention is to provide a method for automatically generating a hexahedral grid with a boundary layer of a reactor fuel assembly, which solves the problem of not being able to use a suitable model due to the complexity of the geometric model when performing thermal-hydraulic analysis of the reactor fuel assembly. The problem of generating a hexahedral grid with a boundary layer using the method provides the possibility to complete the thermal-hydraulic analysis of reactor fuel assemblies using computational fluid dynamics software based on the spectral element method

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  • Method for automatically generating hexahedral mesh with boundary layer of reactor fuel assembly
  • Method for automatically generating hexahedral mesh with boundary layer of reactor fuel assembly
  • Method for automatically generating hexahedral mesh with boundary layer of reactor fuel assembly

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[0028] Combine the following figure 1 The flow chart shown, taking the advanced pressurized water reactor fuel assembly 5 × 5 bundles as an example, the present invention is further described in detail:

[0029] Step 1: Use the UG 10.0 3D modeling software to establish a 3D geometric model of the 5×5 bundles of the advanced pressurized water reactor fuel assembly. The modeling content includes the modeling of the stirring wing and the modeling of the fuel rods: first, the two-dimensional sketch of the stirring wing structure is completed by using the structure diagram of the 5×5 rod bundle of the advanced pressurized water reactor fuel assembly; Using the stretching function to obtain a thick 3D mixing wing model, and using the bending function to bend the mixing wing model, the establishment of the mixing wing model is completed; then, a 3D fuel rod model is established by stretching. When establishing the geometric model, pay attention to the need to increase the diameter o...

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Abstract

The invention discloses a method for automatically generating a hexahedral mesh with a boundary layer of a reactor fuel assembly, which comprises the following steps of: 1, performing geometric pretreatment, and reserving a thickness space of a boundary layer mesh on the surface of a fuel rod; 2, partitioning the fluid area, namely partitioning the fluid area into a complex geometric area with stirring and mixing wings and a simple geometric area; 3, utilizing a tetrahedral mesh division method to complete mesh division of the complex geometric area with the mixing wings obtained in the step 2; 4, converting the tetrahedral mesh generated in the step 3 into an HEX8 hexahedral mesh; 5, converting the HEX8 hexahedral mesh generated in the step 4 into an HEX20 hexahedral mesh; 6, generating asimple geometric region grid; 7, generating a boundary layer grid near the surface of the fuel rod. The method solves the problems that computational fluid mechanics calculation software based on a spectral element method is difficult to establish a complex geometric model, and a complex geometric hexahedral mesh with a boundary layer cannot be generated.

Description

technical field [0001] The invention belongs to the technical field of geometric hexahedral grid generation methods, in particular to a method for automatically generating hexahedral grids with boundary layers of a reactor fuel assembly. Background technique [0002] At present, computational fluid dynamics analysis, as an important analysis method, occupies an important position in the field of engineering calculation and scientific research. At present, there are many types of CFD analysis tools, and the numerical discrete methods used are not the same. At present, the commonly used calculation methods are mostly those with good geometric applicability and low calculation accuracy: they are relatively tolerant in terms of mesh division, and can use tetrahedral mesh to complete spatial discretization and complete the simulation calculation of fluid domains enclosed by complex geometry. However, due to the inherent properties of the calculation method, the calculation accur...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/20
CPCG06T17/205
Inventor 王明军鞠浩然秋穗正田文喜苏光辉
Owner XI AN JIAOTONG UNIV
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