Coefficient adaptive triangulation for strongly anisotropic problems Metadata

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Title

  • Main Title Coefficient adaptive triangulation for strongly anisotropic problems

Creator

  • Author: D`Azevedo, E.F.
    Creator Type: Personal
  • Author: Romine, C.H.
    Creator Type: Personal
  • Author: Donato, J.M.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: USDOE, Washington, DC (United States)

Publisher

  • Name: Oak Ridge National Laboratory
    Place of Publication: Tennessee
    Additional Info: Oak Ridge National Lab., TN (United States)

Date

  • Creation: 1996-01-01

Language

  • English

Description

  • Content Description: Second order elliptic partial differential equations arise in many important applications, including flow through porous media, heat conduction, the distribution of electrical or magnetic potential. The prototype is the Laplace problem, which in discrete form produces a coefficient matrix that is relatively easy to solve in a regular domain. However, the presence of anisotropy produces a matrix whose condition number is increased, making the resulting linear system more difficult to solve. In this work, we take the anisotropy into account in the discretization by mapping each anisotropic region into a ``stretched`` coordinate space in which the anisotropy is removed. The region is then uniformly triangulated, and the resulting triangulation mapped back to the original space. The effect is to generate long slender triangles that are oriented in the direction of ``preferred flow.`` Slender triangles are generally regarded as numerically undesirable since they tend to cause poor conditioning; however, our triangulation has the effect of producing effective isotropy, thus improving the condition number of the resulting coefficient matrix.
  • Physical Description: 23 p.

Subject

  • Keyword: Electric Potential
  • Keyword: Anisotropy
  • STI Subject Categories: 99 Mathematics, Computers, Information Science, Management, Law, Miscellaneous
  • Keyword: Calculation Methods
  • Keyword: Partial Differential Equations
  • Keyword: Thermal Conduction
  • STI Subject Categories: 66 Physics
  • Keyword: Matrices

Source

  • Other Information: PBD: Jan 1996

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report

Format

  • Text

Identifier

  • Other: DE96007961
  • Report No.: ORNL/TM--13086
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/221032
  • Office of Scientific & Technical Information Report Number: 221032
  • Archival Resource Key: ark:/67531/metadc669193

Note

  • Display Note: OSTI as DE96007961