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第十一届全国空气弹性学术交流会

作者： Deng-Shouchun,Li-Guibo and Yang-Guowei Laboratory of High-temperature Gas-dynamics,Institute of Mechanics,Chinese Academy of Sciences,Beijing,100190

Three dynamic moving mesh algorithms for unsteady flow simulations are *** three moving grid algorithms use a method of background grid-based interpolation,and the background grids may be continuum, spatial beams or linear tensile and nonlinear torsional *** aeroelastic calculating,the preturbations of the background grids at each time step are caculated according to the displacement increments of the surface and used to determine the motion changes of CFD grids,several Euler/Navier-Stokes solvers ***/parallel multiblock CFD programs are developed along with the moving mesh *** results are presented for grid deformation and the unsteady flow calculations of AGARD 445.6 weakened wing.

关键词： aeroelastic CFD grid deformation FEM beam continuum interpolation spring

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Delaunay graph-based moving mesh method with damping functions

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Chinese Journal of Aeronautics 2018年第11期31卷 2093-2103页

作者： Yibin WANG Ning QIN Ning ZHAO College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Department of Mechanical Engineering The University of Sheffield

The fluid–structure interaction and aerodynamic shape optimization usually involve the moving or deforming boundaries, thus the dynamic mesh techniques are the key techniques to cope with such deformation. A novel dynamic mesh method was developed based on the Delaunay graph in this paper. According to the Delaunay graph, the mesh points were divided into groups. In each group, a factor ranging from 0 to 1 was calculated based on the area/volume ratio. By introducing a proper function for this factor, this method can control the mesh quality with high efficiency. Several test cases were compared with other dynamic mesh methods regarding mesh quality and CPU time, such as radial basis function method and Delaunay graph mapping method.

关键词： Delaunay graph mapping Dynamic mesh grid deformation Mesh Moving mesh

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维普期刊数据库

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Buffeting numerical simulation coupled with aerodynamics and structure based on MDDES

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Science China(Technological Sciences) 2013年第10期56卷 1550-1560页

作者： HUANG JiangTao GAO ZhengHong National Key Laboratory of Aerodynamic Design and Research Northwestern Polytechnical University

Unsteady effect of seriously separated flow is the main factor of modern aircraft buffeting. So accurate simulation of this complex flow becomes the basis associated with the research of aircraft buffeting. This paper constructs an unsteady numerical simulation method for separation flow based on modified delayed detached eddy simulation (MDDES) method by considering both modern computer resources and the credibility of simulating separation flow. The proposed method is also verified through the simulation of the separated flow by a typical fighter at high angle of attack. And then a robust and efficient technology for deforming mesh is established using radial basis function (RBF) and infinite interpolation method. Moreover, the platform for numerical simulation of buffeting is set up in combination with the structural dynamics equations in the modal space, by which the research of vertical tail buffeting caused by edge vortex is carried out on a fighter at large angle of attack. Through spectrum analysis of time-domain response of pressure pulsation on the location of vortex rupture, the results show that the pulsation frequency of vortex structure with different scales covers the inherent modal frequency of vertical tail structure. Compared to the Reynolds-averaged Navier-Stokes equations, the MDDES method can distinguish the more detailed and higher frequency small-scale vortex structure. Unlike flutter, displacement acceleration response of each mode in buffeting is dominated by its own mode. There exists strong coupling between the first bending mode and first torsion mode, and it leads to acceleration and large inertia impact of structure, which is the main factor causing structural fatigue. In sum, the obtained results verify the validity of the numerical means and the corresponding methods in the paper.

关键词： aircraft buffeting modified delayed detached eddy simulation (MDDES) modal super-position grid deformation

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Robust Design of Supercritical Wing Aerodynamic Optimization Considering Fuselage Interfering

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Chinese Journal of Aeronautics 2010年第5期23卷 523-528页

作者：黄江涛高正红赵轲白俊强西北工业大学翼型叶栅空气动力国防科技重点实验室陕西西安710072

Robust optimization approach for aerodynamic design has been developed and applied to supercritical wing aerodynamic design. The aerodynamic robust optimization design system consists of genetic optimization algorithm, improved back propagation （BP） neural network and deformation grid technology. In this article, the BP neural network has been improved in two major aspects to enhance the training speed and precision. Uniformity sampling is adopted to generate samples which will be used to establish surrogate model. The testing results show that the prediction precision of the improved BP neural network is reliable. On the assumption that the law of Mach number obeys normal distribution, supercritical wing configuration considering fuselage interfering of a certain aerobus has been taken as a typical example, and five design sections and twist angles have been optimized. The results show that the optimized wing, which considers robust design, has better aerodynamic characteristics. What＇s more, the intensity of shock wave has been reduced.

关键词： aircraft design robust design BP neural network grid deformation normal distribution genetic algorithm

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