Optimal local truncation error method to solution of 2-D time-independent elasticity problems with optimal accuracy on irregular domains and unfitted Cartesian meshes

Alexander Idesman, Bikash Dey

Research output: Contribution to journalArticlepeer-review

Abstract

Recently we have developed the optimal local truncation error method (OLTEM) for scalar PDEs on irregular domains and unfitted Cartesian meshes. Here, OLTEM is extended to a much more general case of a system of PDEs for the 2-D time-independent elasticity equations on irregular domains. Compact 9-point uniform and nonuniform stencils (with the computational costs of linear finite elements) are used with OLTEM. The stencil coefficients are assumed to be unknown and are calculated by the minimization of the local truncation error. It is shown that the second order of accuracy is the maximum possible accuracy for 9-point stencils independent of the numerical technique used for their derivations. The special treatment of the Neumann boundary conditions has been developed that does not increase the size of the stencils. The numerical examples are in agreement with the theoretical findings. They also show that due to the minimization of the local truncation error, OLTEM is much more accurate than linear finite elements and than quadratic finite elements (up to engineering accuracy of 0.1%–1%) at the same numbers of degrees of freedom. Due to the computational efficiency and trivial unfitted Cartesian meshes that are independent of irregular domains, the proposed technique with no remeshing for the shape change of irregular domains will be effective for many engineering applications.

Original languageEnglish
Pages (from-to)2610-2630
Number of pages21
JournalInternational Journal for Numerical Methods in Engineering
Volume123
Issue number11
DOIs
StateAccepted/In press - 2022

Keywords

  • Cartesian meshes
  • irregular domains
  • local truncation error
  • numerical approach
  • optimal accuracy
  • time-independent elasticity

Fingerprint

Dive into the research topics of 'Optimal local truncation error method to solution of 2-D time-independent elasticity problems with optimal accuracy on irregular domains and unfitted Cartesian meshes'. Together they form a unique fingerprint.

Cite this