Efficient mesh deforming method and device based on dynamic control point

A mesh deformation and dynamic control technology, applied in the field of computational mechanics, can solve problems such as inability to adapt to large deformations and low computational efficiency, and achieve the effects of good mesh quality, high computational efficiency, and improved adaptability

Inactive Publication Date: 2017-04-05
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0019] The purpose of the present invention is to solve the problems that the existing RBF method has low calculation efficiency and cannot adapt to large deformation, and proposes an efficient mesh deformation method based on dynamic control points (

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  • Efficient mesh deforming method and device based on dynamic control point
  • Efficient mesh deforming method and device based on dynamic control point
  • Efficient mesh deforming method and device based on dynamic control point

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[0059] Example 1

[0060] The following is a set of simple two-dimensional unstructured mesh deformation problems to verify and illustrate the mesh deformation technology proposed by the present invention. The effect of the present invention is compared with the original (without data reduction) RBF method (Original RBF Method) and the ordinary data reduction RBF method (Data-reduced RBF Method).

[0061] like image 3 As shown in (a), it is a set of simple two-dimensional unstructured grids, the inner and outer boundaries of the grid are squares, the side length of the inner boundary square is 2, and the side length of the outer boundary square is 6. Now let's translate the inner boundary down, 0.01 in each step, deforming the mesh in the process. Consider the amount of deformation the mesh can withstand before negative volume occurs.

[0062] The original (without data reduction) RBF method, the normal data reduction RBF method and the DCP-RBF method are used for mesh def...

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Abstract

The invention belongs to the technical field of computational mechanics, and relates to an efficient mesh deforming method and device based on a dynamic control point. The method includes the following steps that 1, an initial control point is selected from boundary mesh nodes; 2, a control point set is used for mesh deforming; 3, the mesh unit with the poorest quality is found out from all mesh units of a deformed mesh; 4, control point replacement is carried out, and control points are gathered nearby the mesh unit with the poorest quality; 5, the steps 2, 3 and 4 are repeated until the appearance or position of an object in a computational domain does not change. Compared with the prior art, the efficient mesh deforming method is high in calculation efficiency, greatly improves the adapting capacity of the mesh for large deformation, ensures mesh quality and is suitable for many unsteady computational fluid mechanics problems.

Description

technical field [0001] The invention belongs to the technical field of computational mechanics and relates to an improved RBF interpolation grid deformation method based on dynamic control points. Background technique [0002] In the research fields of fluid-structure interaction, aeroelasticity, and aerodynamic shape optimization, the geometric shape of the computational domain often changes during the calculation process using CFD numerical methods. Therefore, mesh deformation techniques are needed to adapt the mesh to changes in the shape of the computational domain. The mesh deformation technology based on radial basis function (radial basis function, RBF) interpolation has the advantages of high computational efficiency, strong ability to adapt to large deformation, and good mesh quality after deformation. The following briefly introduces the basic principle of RBF interpolation grid deformation. [0003] RBF is a general term for a class of functions, in the form of ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 雷娟棉牛健平吴小胜何建东刘清扬
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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