About: Graded mesh refinement and error estimates of higher order for DGFE solutions of elliptic boundary value problems in polygons     Goto   Sponge   NotDistinct   Permalink

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  • Error estimates for DGFE solutions are well investigated if one assumes that the exact solution is sufficiently regular. In this article, we consider a Dirichlet and a mixed boundary value problem for a linear elliptic equation in a polygon. It is well known that the first derivatives of the solutions develop singularities near reentrant corner points or points where the boundary conditions change. On the basis of the regularity results formulated in Sobolev-Slobodetskii spaces and weighted spaces of Kondratiev type, we prove error estimates of higher order for DGFE solutions using a suitable graded mesh refinement near boundary singular points. The main tools are as follows: regularity investigation for the exact solution relying on general results for elliptic boundary value problems, error analysis for the interpolation in Sobolev-Slobodetskii spaces, and error estimates for DGFE solutions on special graded refined meshes combined with estimates in weighted Sobolev spaces. Our main result is that there exist a local grading of the mesh and a piecewise interpolation by polynoms of higher degree such that we will get the same order O (ha) of approximation as in the smooth case.
  • Error estimates for DGFE solutions are well investigated if one assumes that the exact solution is sufficiently regular. In this article, we consider a Dirichlet and a mixed boundary value problem for a linear elliptic equation in a polygon. It is well known that the first derivatives of the solutions develop singularities near reentrant corner points or points where the boundary conditions change. On the basis of the regularity results formulated in Sobolev-Slobodetskii spaces and weighted spaces of Kondratiev type, we prove error estimates of higher order for DGFE solutions using a suitable graded mesh refinement near boundary singular points. The main tools are as follows: regularity investigation for the exact solution relying on general results for elliptic boundary value problems, error analysis for the interpolation in Sobolev-Slobodetskii spaces, and error estimates for DGFE solutions on special graded refined meshes combined with estimates in weighted Sobolev spaces. Our main result is that there exist a local grading of the mesh and a piecewise interpolation by polynoms of higher degree such that we will get the same order O (ha) of approximation as in the smooth case. (en)
Title
  • Graded mesh refinement and error estimates of higher order for DGFE solutions of elliptic boundary value problems in polygons
  • Graded mesh refinement and error estimates of higher order for DGFE solutions of elliptic boundary value problems in polygons (en)
skos:prefLabel
  • Graded mesh refinement and error estimates of higher order for DGFE solutions of elliptic boundary value problems in polygons
  • Graded mesh refinement and error estimates of higher order for DGFE solutions of elliptic boundary value problems in polygons (en)
skos:notation
  • RIV/00216208:11320/12:10128842!RIV13-GA0-11320___
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  • I, P(GA201/08/0012), Z(MSM0021620839)
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  • 4
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  • 138352
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  • RIV/00216208:11320/12:10128842
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  • polygons; elliptic boundary value problems; DGFE; higher order; error estimates; refinement; Graded mesh (en)
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http://linked.open...odStatuVydavatele
  • US - Spojené státy americké
http://linked.open...ontrolniKodProRIV
  • [E2BFC6FF0F22]
http://linked.open...i/riv/nazevZdroje
  • Numerical Methods for Partial Differential Equations
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  • 28
http://linked.open...iv/tvurceVysledku
  • Feistauer, Miloslav
  • Saendig, Anna-Margarete
http://linked.open...ain/vavai/riv/wos
  • 000303052000002
http://linked.open...n/vavai/riv/zamer
issn
  • 0749-159X
number of pages
http://bibframe.org/vocab/doi
  • 10.1002/num.20668
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  • 11320
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