Computational Geosciences

, Volume 6, Issue 3–4, pp 285–314 | Cite as

Shape Functions for Velocity Interpolation in General Hexahedral Cells

  • R.L. Naff
  • T.F. Russell
  • J.D. Wilson
Article

Abstract

Numerical methods for grids with irregular cells require discrete shape functions to approximate the distribution of quantities across cells. For control-volume mixed finite-element (CVMFE) methods, vector shape functions approximate velocities and vector test functions enforce a discrete form of Darcy's law. In this paper, a new vector shape function is developed for use with irregular, hexahedral cells (trilinear images of cubes). It interpolates velocities and fluxes quadratically, because as shown here, the usual Piola-transformed shape functions, which interpolate linearly, cannot match uniform flow on general hexahedral cells. Truncation-error estimates for the shape function are demonstrated. CVMFE simulations of uniform and non-uniform flow with irregular meshes show first- and second-order convergence of fluxes in the L2 norm in the presence and absence of singularities, respectively.

control-volume method CVMFE method distorted grid hexahedral grid local Darcy law local mass conservation mixed method Piola transformation vector shape function 3-D 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • R.L. Naff
    • 1
  • T.F. Russell
    • 2
  • J.D. Wilson
    • 2
  1. 1.U.S. Geological SurveyDenverUSA
  2. 2.University of Colorado at DenverDenverUSA

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