A Mesh Deformation Quality Evaluation Method in CFD Calculation Based on Mapping Process

Abstract

The invention discloses a method for evaluating grid deformation quality in CFD calculation based on a mapping process. The initial grid generates a deformed grid according to a certain algorithm, and the deformation displacement of grid nodes is used to generate a deformed grid quality measurement value. A deformed mesh quality evaluation method is formed; the deformed mesh quality metric is derived based on the deformation gradient tensor and the Green strain tensor in continuum mechanics. The method of the present invention is only based on the grid node displacement value and the initial grid node coordinates in the deformation process, and the grid node displacement value is directly obtained in the grid deformation interpolation algorithm, so the evaluation method is simple and convenient to calculate. It can be applied to grid quality evaluation involving dynamic grid solution in the field of computational fluid dynamics.

Description

technical field [0001] The invention belongs to the field of computational fluid dynamics (CFD) and the technical field of aeroelasticity, and in particular relates to a method for evaluating mesh deformation quality in CFD calculation based on a mapping process. Background technique [0002] Computational Fluid Dynamics (CFD) is a science that uses a computer as a tool to solve the equation of motion of fluid by using discretized grid technology and numerical calculation method, thereby revealing the flow mechanism and flow law. In recent decades, due to the needs of practical problems, as well as the rapid development of computing technology and the advancement of computer hardware, CFD analysis methods have developed by leaps and bounds. [0003] Aeroelasticity, as a branch of applied mechanics, mainly studies the coupling between aerodynamic force, elastic force and inertial force. Under the action of aerodynamic force, the elastic structure will vibrate and deform, and...

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Problems solved by technology

[0008] In order to solve the problem that the existing deformed grid quality evaluation method in the above prior art requires a lot of information and a large amount of calculation, the present invention proposes a deformed grid quality evaluation method based on the grid deformation mapping process, and the calculation is based on Deformed grid quality metrics during the mapping process, without the need to extract the coordinate information of each grid point after deformation, the calculation efficiency is higher

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