Volume 24, Issue 2
An Enhanced Finite Element Method for a Class of Variational Problems Exhibiting the Lavrentiev Gap Phenomenon.

Xiaobing Feng & Stefan Schnake

Commun. Comput. Phys., 24 (2018), pp. 576-592.

Published online: 2018-08

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  • Abstract

This paper develops an enhanced finite element method for approximating a class of variational problems which exhibits the Lavrentiev gap phenomenon in the sense that the minimum values of the energy functional have a nontrivial gap when the functional is minimized on the spaces W1,1 and W1,∞. To remedy the standard finite element method, which fails to converge for such variational problems, a simple and effective cut-off procedure is utilized to design the (enhanced finite element) discrete energy functional. In essence the proposed discrete energy functional curbs the gap phenomenon by capping the derivatives of its input on a scale of O(h−α) (where h denotes the mesh size) for some positive constant α. A sufficient condition is proposed for determining the problem-dependent parameter α. Extensive 1-D and 2-D numerical experiment results are provided to show the converg

  • Keywords

Energy functional, variational problems, minimizers, singularities, Lavrentiev gap phenomenon, finite element methods, cut-off procedure.

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COPYRIGHT: © Global Science Press

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