On hp refinements of independent cover numerical manifold method—some strategies and observations

Zhang, Ning; Zheng, Hong; Li, Xu; Wu, Wenan

doi:10.1007/s11431-022-2221-5

Cited by 10 publications

(1 citation statement)

References 47 publications

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“…In doing so, we wish to refine the mesh step-by-step while keeping the element shape as regular as possible, which is not an easy task. Sometimes we even use other techniques ( Fish, 1992; Kim, 2002; Zhang et al ., 2022) to implement refinements based on a relaxed requirement of the mesh. Also, we hope to know whether the current mesh is sufficiently accurate, but it is hard to judge this by experience alone.…”

Section: Application To Adaptive Refinementsmentioning

confidence: 99%

A direct solution to linear constraints in the finite element analysis and its application illustrations

Zhang,

Zheng,

Yuan

et al. 2023

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PurposeThis article aims to present a direct solution to handle linear constraints in finite element (FE) analysis without penalties or the Lagrange multipliers introduced.Design/methodology/approachFirst, the system of linear equations corresponding to the linear constraints is solved for the leading variables in terms of the free variables and the constants. Then, the reduced system of equilibrium equations with respect to the free variables is derived from the finite-dimensional virtual work equation. Finally, the algorithm is designed.FindingsThe proposed procedure is promising in three typical cases: (1) to enforce displacement constraints in any direction; (2) to implement local refinements by allowing hanging nodes from element subdivision and (3) to treat non-matching grids of distinct parts of the problem domain. The procedure is general and suitable for 3D non-linear analyses.Research limitations/implicationsThe algorithm is fitted only to the Galerkin-based numerical methods.Originality/valueThe proposed procedure does not need Lagrange multipliers or penalties. The tangential stiffness matrix of the reduced system of equilibrium equations reserves positive definiteness and symmetry. Besides, many contemporary Galerkin-based numerical methods need to tackle the enforcement of the essential conditions, whose weak forms reduce to linear constraints. As a result, the proposed procedure is quite promising.

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Section: Application To Adaptive Refinementsmentioning

confidence: 99%