Finite element numerical model debugging method based on grid structure

Abstract

The invention relates to a finite element numerical model debugging method based on a grid structure, which comprises the following steps of: dividing a geologic model into a plurality of tetrahedron four-node, pentahedron six-node and hexahedron eight-node grid objects; converting the tetrahedron four-node and pentahedron six-node grid objects into hexahedron eight-node grid objects; classifying unit information by using the hexahedron eight-node grid objects and the hexahedron eight-node grid objects which are obtained by converting the tetrahedron four-node and pentahedron six-node grid objects as units to obtain node and structure information;; numbering the nodes according to the node position and the anticlockwise sequence from bottom to top; numbering plane elements in all the hexahedron eight-node units, i.e. making all nodes point to the inner part of the unit according to the right hand rule; combining the node number in the plane elements to obtain the plane element code; and carrying out area retrieval in 6*ne plane elements and removing zero-area plane elements, left, right, front, back, upper and lower boundaries and public plane elements, wherein the residual plane element is the probable model error position.

Description

technical field [0001] The invention relates to the preprocessing part in the field of engineering numerical analysis such as civil engineering. Background technique [0002] Numerical simulation technology is an important means of mechanical analysis in civil engineering, and geological modeling is the main component of the pre-processing of numerical simulation technology. In the construction of models under complex conditions such as dam abutments, large underground caverns, and complex components, due to the complex geometric conditions of the structures and the influence of the intersecting relationship of the structural plane space, a little carelessness may cause errors in the model, making the calculation The result is distorted and cannot even be calculated. In order to find out the source of the error, the common method is to check from the point-line-surface modeling process, and to traverse in a certain order, such as point-by-point, line-by-line, and surface-by...

AI Technical Summary

Problems solved by technology

In the construction of models under complex conditions such as dam abutments, large underground caverns, and complex components, due to the complex geometric conditions of the structures and the influence of the intersecting relationship of the structural plane space, a little carelessness may cause errors in the model, making the calculation The result is distorted and cannot even be calculated

In order to find out the source of the error, the common method is to check from the point-line-surface modeling process, and to traverse in a certain order, such as point-by-point, line-by-line, and surface-by-surface inspection along the coordinate axis of the model ; If there are many errors in the model, it needs to be eliminated one by one, and repeated many times. It is relatively easy for a simple finite element model. If the number of nodes and elements of the finite element model is tens of thousands or even hundreds of thousands or millions, use ordinary models to check for errors The method seems powerless, not only consumes a lot of time, but also reworks many times, causing researchers to lose patience

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