Structured grid division method for rod bundle assembly with wire winding function

Abstract

The invention discloses a structured grid division method for a rod bundle assembly with a wire winding function. The method comprises the following steps: building a three-dimensional geometric modelof a flow channel of the rod bundle assembly with the wire winding function, and dividing the three-dimensional geometric model into a near-rod channel containing a wire winding feature and a main flow channel not containing the wire winding geometric feature; establishing a two-dimensional plane topological structure for the flow section of the near-rod channel, setting grid node parameters, dividing a two-dimensional structure grid, and performing rotary stretching to obtain a three-dimensional structure grid of the near-rod channel; dividing the flow cross section of the main flow channelinto two-dimensional structure grids and stretching to obtain three-dimensional structure grids of the main flow channel; and finally, splicing the three-dimensional structure grids of the near-rod channel and the main flow channel to finish the structure grid division of the rod bundle assembly with the winding wire. According to the method, the problems of low geometric reduction degree, poor grid quality, difficulty in controlling the number of grids and the like of non-structural grids of the rod bundle assembly with the winding wires are solved; meanwhile, the number and distribution of grids are easy to adjust, and high-quality grids can be provided for CFD calculation of the rod bundle assembly with the winding wires.

Description

technical field [0001] The invention relates to the field of thermal-hydraulic analysis and calculation of nuclear reactor core, in particular to the field of thermal-hydraulic analysis and calculation of nuclear reactor core belt winding rod bundle channel. Background technique [0002] During the operation of a nuclear reactor, the fuel assembly of the core rod bundle is in an environment of high temperature, high pressure and strong radiation. In order to cope with the deformation of the fuel rods caused by coolant flow, fuel pellet swelling, fission gas release and irradiation during the operation of the reactor, the required grid distance between the fuel rods is maintained, and the distance between the coolant and the fuel rods is strengthened. For the heat transfer between fuel assemblies, an appropriate number of spacers are usually installed in the bundle fuel assembly. A helical positioning wire (wrapping wire) wound on a single rod is one of them. The introducti...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a structured grid division method for the belt-wound rod bundle assembly, which solves the problem of the low degree of geometric reduction of the unstructured grid. , the grid quality is poor, the space filling rate is low, and the problem of occupying a large amount of computing resources is overcome. At the same time, the problem of the rough surface of the winding wire in the mesh model generated by the "grid marking method" can be overcome, and the tape winding can be better restored. While adjusting the geometric characteristics of the wire rod bundle assembly, the grid node parameters can be flexibly adjusted to provide high-quality mesh for the CFD calculation of the wire rod bundle assembly

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