A higher‐order Trace finite element method for shells

A higher‐order fictitious domain method (FDM) for Reissner–Mindlin shells is proposed which uses a three‐dimensional background mesh for the discretization. The midsurface of the shell is immersed into the higher‐order background mesh and the geometry is implied by level‐set functions. The mechanica...

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Bibliographic Details
Published in:International journal for numerical methods in engineering 2021-03, Vol.122 (5), p.1217-1238, Article nme.6558
Main Authors: Schöllhammer, Daniel, Fries, Thomas‐Peter
Format: Article
Language:English
Subjects:
Boundary conditions
Differential calculus
Differential geometry
fictitious domain methods
Finite element method
implicit geometries
manifolds
Mathematical models
Mindlin plates
Numerical integration
Partial differential equations
shells
Spherical coordinates
tangential differential calculus
Trace FEM
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Summary:A higher‐order fictitious domain method (FDM) for Reissner–Mindlin shells is proposed which uses a three‐dimensional background mesh for the discretization. The midsurface of the shell is immersed into the higher‐order background mesh and the geometry is implied by level‐set functions. The mechanical model is based on the tangential differential calculus which extends the classical models based on curvilinear coordinates to implicit geometries. The shell model is described by partial differential equations on manifolds and the resulting FDM may typically be called Trace FEM. The three standard key aspects of FDMs have to be addressed in the Trace FEM as well to allow for a higher‐order accurate method: (i) numerical integration in the cut background elements, (ii) stabilization of awkward cut situations and elimination of linear dependencies, and (iii) enforcement of boundary conditions using Nitsche's method. The numerical results confirm that higher‐order accurate results are enabled by the proposed method provided that the solutions are sufficiently smooth.
ISSN:0029-5981
1097-0207
DOI:10.1002/nme.6558