Gradient WEB-spline finite element method for solving two-dimensional quasilinear elliptic problems

In this paper, a two-dimensional quasilinear elliptic problem of the form -divF(x,▽u)=g(x) is considered. This problem is ill-conditioned and we therefore propose a modified iterative algorithm based on coupling of the Sobolev space gradient method and WEB-spline finite element method. Applying the...

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Veröffentlicht in:Applied mathematical modelling Jg. 38; H. 2; S. 775 - 783
Hauptverfasser: Zakeri, Ali, Shayegan, Amir Hossein Salehi
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Elsevier Inc 15.01.2014
Schlagworte:
Approximation
Convergence
Finite element method
Mathematical analysis
Mathematical models
Preconditioning operator
Quasilinear elliptic boundary value problems
Sobolev space
Sobolev space gradient method
Two dimensional
WEB-spline finite element method
WEB-spline finite element method
Preconditioning operator
Quasilinear elliptic boundary value problems
Sobolev space gradient method
ISSN:0307-904X
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Zusammenfassung:In this paper, a two-dimensional quasilinear elliptic problem of the form -divF(x,▽u)=g(x) is considered. This problem is ill-conditioned and we therefore propose a modified iterative algorithm based on coupling of the Sobolev space gradient method and WEB-spline finite element method. Applying the preconditioned iterative method, which has been already provided by Farago and Karatson (2001) [1] reduces the our considered problem to a sequence of linear Poisson’s problems. Then the WEB-spline finite element method is applied to the approximate solution of these Poisson’s problems. In this sense, a convergence theorem is proved and the advantages of this technique than the gradient finite element method (GFEM) is also described. Finally, the presented method is tested on some examples and compared with GFEM. It is shown that the gradient WEB-spline finite element method gives better test results.
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ISSN:0307-904X
DOI:10.1016/j.apm.2013.06.018