Advances and perspectives in numerical manifold method and its applications
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摘要:
基于有限覆盖技术的数值流形方法是一种新的广义的数值方法.该方法的场函数近似原理和有限元、无网格、单位分解等方法相似,但在网格划分、覆盖形式、近似函数等方面有其自身的特点和优势.对该方法近年来在理论研究和应用方面取得的重要进展进行了综述.在理论研究方面, 目前已对不同形式物理覆盖流形单元的性能进行了研究,结果表明流形单元的精度较有限单元高,且提高覆盖函数的阶次能提高单元的精度;同时理论研究已由二维低阶流形方法推广到三维高阶流形方法,由线性流形方法推广到非线性流形方法,由基于能量原理的流形方法推广到基于加权余量的流形方法,非协调流形方法、无网格流形方法等也已开展了研究; 此外,覆盖系统的自动生成、覆盖函数的形式以及边界条件的处理方法等流形方法相关理论的研究也取得了进展.在应用方面,开展了有关岩石破坏和裂纹扩展等非连续变形分析更深入的研究,并已逐步推广到金属塑性变形分析、多孔介质变形分析以及温度场的数值分析等多个领域.针对目前流形方法的研究和应用现状,该文展望了流形方法理论及实现方法的研究方向、及其在计算流体力学、金属成形等大变形问题、多物理场分析等领域的应用前景.
Abstract:Numerical manifoldmethod(NMM) is a new and generalized numerical method based onfinite cover technique. It is similar to finite element method,meshless method and partition of unit method on the approximationprinciple of field functions, but has its own characteristics andadvantages on mesh generation, cover system and approximationfunction. The important advances on numerical manifold method andits applications in recent years were reviewed in this paper.Performance assessment for manifold elements with differentphysical cover showed that manifold elements have highercomputational accuracy than finite element, and the computationalaccuracy can be improved by employing high order cover functions.Theoretical studies on manifold method have also been extend tothree dimension high order manifold method from two dimension loworder manifold method, to nonlinear manifold method from linearmanifold method, to Galerkin weighted residual manifold methodfrom based on energy principle. Incompatible manifold method andmeshless manifold method have been investigated as well. Moreover,the researches on some relative theories of NMM, such as automaticgeneralization of cover system, the form of cover functions andtreatments of boundary conditions, have been developed. Inapplications of manifold method, discontinuous deformationproblems on rock damage and crack propagation have been analyzedmore deeply than before, and it has been extend to apply invarious fields of engineering gradually, such as metal forming,porous media mechanics, temperature field etc. Based on the recentwork, some perspectives in research topics for NMM and itsapplications in computational fluid dynamics (CFD), metal forming,multiphysical field and other domains are presented.
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