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      https://www.ias.ac.in/article/fulltext/pmsc/125/02/0239-0270

    • Keywords

       

      Spectral element method; non-smooth domains; geometric mesh; vertex singularity; edge singularity; vertex-edge singularity; differentiability estimates; stability estimates; exponential accuracy.

    • Abstract

       

      This is the first of a series of papers devoted to the study of ℎ- 𝑝 spectral element methods for solving three dimensional elliptic boundary value problems on non-smooth domains using parallel computers. In three dimensions there are three different types of singularities namely; the vertex, the edge and the vertex-edge singularities. In addition, the solution is anisotropic in the neighbourhoods of the edges and vertex-edges. To overcome the singularities which arise in the neighbourhoods of vertices, vertex-edges and edges, we use local systems of coordinates. These local coordinates are modified versions of spherical and cylindrical coordinate systems in their respective neighbourhoods. Away from these neighbourhoods standard Cartesian coordinates are used. In each of these neighbourhoods we use a geometrical mesh which becomes finer near the corners and edges. The geometrical mesh becomes a quasi-uniform mesh in the new system of coordinates. We then derive differentiability estimates in these new set of variables and state our main stability estimate theorem using a non-conforming ℎ- 𝑝 spectral element method whose proof is given in a separate paper.

    • Author Affiliations

       

      P Dutt1 Akhlaq Husain2 A S Vasudeva Murthy3 C S Upadhyay4

      1. Department of Mathematics & Statistics, Indian Institute of Technology, Kanpur 208 016, India
      2. Department of Mathematics, The LNM Institute of Information Technology, Jaipur 302 031, India
      3. TIFR Centre For Applicable Mathematics, Tata Institute of Fundamental Research, Bangalore 560 065, India
      4. Department of Aerospace Engineering, Indian Institute of Technology, Kanpur 208 016, India
    • Dates

       
  • Proceedings – Mathematical Sciences | News

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