Generation method of quadrilateral grid of geometric model with any internal feature constraints

Abstract

The invention relates to a generation method of quadrilateral grids of a geometric model with any internal feature constraints, which outstandingly enhances the generation quality and efficiency of the quadrilateral grids and has convenience and practicability. The generation method comprises the following steps of: (1.1) building an entitative geometric model according to an entity to be analyzed by utilizing a computer; and determining the shapes and the positions of constraint lines and density lines of the entitative geometric model, the positions of constraint points and density points and the range and the inner and outer boundaries of each region; (1.2) generating grid nodes on the inner and outer boundaries, the constraint lines and the density lines of the entitative geometric model according to grid size information set by a user, and numbering the grid nodes; viewing the constraint points and the density points as newly generated grid nodes, and numbering the newly generated grid nodes; (1.3) viewing the constraint lines, the density lines, the constraint points and the density points as internal cavities with areas of zero, generating node rings on the inner and outer boundaries of each region, and transforming a multiply connected region with the internal feature constraints into a simply connected region; (1.4) dividing the quadrilateral grids in each region; and finally generating the quadrilateral grids with the internal feature constraints.

Description

technical field [0001] The invention belongs to the field of engineering model analysis, and relates to a method for generating a quadrilateral grid of a geometric model with arbitrary internal feature constraints, and is especially suitable for the preprocessing stage of analyzing an engineering model by using methods such as finite element, finite volume, and finite difference. Background technique [0002] Numerical methods such as finite element, finite volume, and finite difference have been widely used in numerical calculations of various scientific and engineering problems. Before applying these numerical methods to solve problems, an extremely important step is to discretize the geometric shape of the analysis model. That is, grid division. The main steps of numerical analysis of engineering problems include geometric modeling, model discretization, numerical solution and result post-processing. According to survey statistics, model discretization (grid division) us...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the existing quadrilateral grid generation method cannot directly deal with internal feature constraints, and to provide a method for automatically generating quadrilateral grids for geometric models with arbitrary feature constraints inside, which can significantly improve grid quality. Generated quality and efficiency, convenient and practical, high degree of automation, strong adaptability, easy to control density, standardized mesh shape, easy to control the number of cells

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