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Gravity changes and surface deformations due to faults with different geometry
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作者 白志明 王椿镛 申重阳 《Acta Seismologica Sinica(English Edition)》 CSCD 1999年第6期690-698,728,共10页
Based on the formulae of the gravity changes and surface deformations raised by the dislocation of a point source,the gravity changes and deformations caused by the dislocations of fault with arbitrary geometry are co... Based on the formulae of the gravity changes and surface deformations raised by the dislocation of a point source,the gravity changes and deformations caused by the dislocations of fault with arbitrary geometry are computed by using numerical method. The results show that both of the dislocation and the geometry of the fault plane are the basic elements that determine the gravity and deformation effects. Gravity changes, vertical deformations and apparent vertical deformations induced by the dislocation are alike in their characteristic patterns. The similarities and differences of these patterns provide us a probability in acquiring the gravity and deformation anomalies due to faulting from the observed data. Thus the geometric and kinematic features of the earthquake-generating faults can be appropriately distinguished and evaluated. 展开更多
关键词 numerical method fault dislocations arbitrary geometry gravity changes and deformations
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A novel surface mesh deformation method for handling wing-fuselage intersections 被引量:2
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作者 Mario Jaime Martin-Burgos Daniel González-Juárez Esther Andrés-Pérez 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2017年第1期264-273,共10页
This paper describes a method for mesh adaptation in the presence of intersections, such as wing-fuselage. Automatic optimization tools, using Computational Fluid Dynamics(CFD) simulations, face the problem to adapt... This paper describes a method for mesh adaptation in the presence of intersections, such as wing-fuselage. Automatic optimization tools, using Computational Fluid Dynamics(CFD) simulations, face the problem to adapt the computational grid upon deformations of the boundary surface. When mesh regeneration is not feasible, due to the high cost to build up the computational grid, mesh deformation techniques are considered a cheap approach to adapt the mesh to changes on the geometry. Mesh adaptation is a well-known subject in the literature; however, there is very little work which deals with moving intersections. Without a proper treatment of the intersections,the use of automatic optimization methods for aircraft design is limited to individual components.The proposed method takes advantage of the CAD description, which usually comes in the form of Non-Uniform Rational B-Splines(NURBS) patches. This paper describes an algorithm to recalculate the intersection line between two parametric surfaces. Then, the surface mesh is adapted to the moving intersection in parametric coordinates. Finally, the deformation is propagated through the volumetric mesh. The proposed method is tested with the DLR F6 wing-body configuration. 展开更多
关键词 Aerodynamic shape optimization Computational fluid dynamics Computer-assisted design geometry parameterizationMesh deformation Non-Uniform Rational B-Splines
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Chiral geometry in multiple chiral doublet bands
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作者 张灏 陈启博 《Chinese Physics C》 SCIE CAS CSCD 2016年第2期25-32,共8页
The chiral geometry of multiple chiral doublet bands with identical configuration is discussed for different triaxial deformation parameters γ in the particle rotor model with πh11/2×γh11/2^-1.The energy spect... The chiral geometry of multiple chiral doublet bands with identical configuration is discussed for different triaxial deformation parameters γ in the particle rotor model with πh11/2×γh11/2^-1.The energy spectra,electromagnetic transition probabilities B(M1) and B(E2),angular momenta,and K-distributions are studied.It is demonstrated that the chirality still remains not only in the yrast and yrare bands,but also in the two higher excited bands whenγ deviates from 30°.The chiral geometry relies significantly on γ,and the chiral geometry of the two higher excited partner bands is not as good as that of the yrast and yrare doublet bands. 展开更多
关键词 multiple chiral doublet bands particle rotor model triaxial deformation parameter chiral geometry
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Spectral Element Discretization of the Stokes Equations in Deformed Axisymmetric Geometries
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作者 Zakaria Belhachmi Andreas Karageorghis 《Advances in Applied Mathematics and Mechanics》 SCIE 2011年第4期448-469,共22页
In this paper,we study the numerical solution of the Stokes system in deformed axisymmetric geometries.In the azimuthal direction the discretization is carried out by using truncated Fourier series,thus reducing the d... In this paper,we study the numerical solution of the Stokes system in deformed axisymmetric geometries.In the azimuthal direction the discretization is carried out by using truncated Fourier series,thus reducing the dimension of the problem.The resulting two-dimensional problems are discretized using the spectral element method which is based on the variational formulation in primitive variables.The meridian domain is subdivided into elements,in each of which the solution is approximated by truncated polynomial series.The results of numerical experiments for several geometries are presented. 展开更多
关键词 Spectral element method Stokes equations variational formulation deformed geometries Fourier expansion
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