A multi-block structure meshing method for unsteady flow field of spring valve with complex structure

Abstract

The purpose of the present invention is to provide a multi-block structure grid division method for the unsteady flow field of a complex structure spring valve, which includes the following steps: extracting a flow field model from a design model of a spring check valve; The simplified two-dimensional watershed of the model is divided into moving and non-moving sub-basins; the height of the first layer grid is calculated, and each two-dimensional sub-basin is divided into structural grids; the upper and lower parts of the two-dimensional structured grid are generated into three-dimensional At the same time, the three-dimensional unstructured mesh of the middle part of the watershed is generated; the three-dimensional flow field meshes of the upper, middle and lower parts of the spring valve are integrated to obtain the overall flow field mesh of the valve group. The invention can provide a grid that conforms to the actual motion law of the model and facilitates the setting of dynamic grids for the numerical simulation of the dynamic flow field of the spring valve. The motion and static sub-regions in the watershed do not affect each other, and the block-structure grid is easy to generate dense motion. Boundary layer mesh, the accuracy of numerical simulation is greatly improved.

Description

technical field [0001] The invention relates to a fluid machinery technology, in particular to a dynamic numerical simulation method of an unsteady flow field. Background technique [0002] As an important control part in the pipeline system, the valve can be used to adjust the flow and pressure of the medium in the pipeline, or to cut off and open the flow medium path. Among them, the main function of the check valve is to cut off the backflow of the medium. The spring check valve plays an important role in the pipeline system, and its function of cutting off the backflow and regulating the flow distribution is very important for the smooth operation of the pipeline system. Spring check valve is a valve that automatically opens and closes according to the working pressure of the pipeline system. It is generally installed in a closed pipeline system to protect the safety of the system. [0003] The research on the dynamic flow field characteristics of the spring check valv...

AI Technical Summary

Problems solved by technology

Traditional meshing methods generally use a single form of mesh in the same computational domain, and mostly use triangular or tetrahedral meshes for complex structures. At the same time, they ignore the processing of boundary layer meshes near the wall. Disadvantages of large size, poor local grid quality, and difficult dynamic grid settings

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