Application of supercomputers to 3-D mantle convection

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Current generation vector machines are providing for the first time the computing power needed to treat planetary mantle convection in a fully three-dimensional fashion. A numerical technique known as multigrid has been implemented in spherical geometry using a hierarchy of meshes constructed from the regular icosahedron to yield a highly efficient three-dimensional compressible Eulerian finite element hydrodynamics formulation. The paper describes the numerical method and presents convection solutions for the mantles of both the earth and the Moon. In the case of the Earth, the convection pattern is characterized by upwelling in narrow circular plumes originating at the core-mantle boundary ... continued below

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Pages: 44

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Baumgardner, J.R. January 1, 1986.

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Description

Current generation vector machines are providing for the first time the computing power needed to treat planetary mantle convection in a fully three-dimensional fashion. A numerical technique known as multigrid has been implemented in spherical geometry using a hierarchy of meshes constructed from the regular icosahedron to yield a highly efficient three-dimensional compressible Eulerian finite element hydrodynamics formulation. The paper describes the numerical method and presents convection solutions for the mantles of both the earth and the Moon. In the case of the Earth, the convection pattern is characterized by upwelling in narrow circular plumes originating at the core-mantle boundary and by downwelling in sheets or slabs derived from the cold upper boundary layer. The preferred number of plumes appears to be on the order of six or seven. For the Moon, the numerical results indicate that development of a predominately L = 2 pattern in later lunar history is a plausible explanation for the present large second-degree non-hydrostatic component in the lunar figure.

Physical Description

Pages: 44

Notes

NTIS, PC A03/MF A01; 1.

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  • NATO advanced study institute on the physics of planets: their origin, evolution and structure, Los Alamos, NM, USA, 1 May 1984

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  • Other: DE86006004
  • Report No.: LA-UR-86-6
  • Report No.: CONF-8405385-1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 6059641
  • Archival Resource Key: ark:/67531/metadc1108970

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  • January 1, 1986

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  • Feb. 22, 2018, 7:45 p.m.

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  • May 21, 2018, 7 p.m.

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Baumgardner, J.R. Application of supercomputers to 3-D mantle convection, article, January 1, 1986; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1108970/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.