25,143 research outputs found
Geodynamo and mantle convection simulations on the Earth Simulator using the Yin-Yang grid
We have developed finite difference codes based on the Yin-Yang grid for the
geodynamo simulation and the mantle convection simulation. The Yin-Yang grid is
a kind of spherical overset grid that is composed of two identical component
grids. The intrinsic simplicity of the mesh configuration of the Yin-Yang grid
enables us to develop highly optimized simulation codes on massively parallel
supercomputers. The Yin-Yang geodynamo code has achieved 15.2 Tflops with 4096
processors on the Earth Simulator. This represents 46% of the theoretical peak
performance. The Yin-Yang mantle code has enabled us to carry out mantle
convection simulations in realistic regimes with a Rayleigh number of
including strongly temperature-dependent viscosity with spatial contrast up to
.Comment: Plenary talk at SciDAC 200
Double-component convection due to different boundary conditions in an infinite slot diversely oriented to the gravity
Onset of small-amplitude oscillatory and both small- and finite-amplitude
steady double-component convection arising due to component different boundary
conditions in an infinite slot is studied for various slot orientations to the
gravity. The main focus is on two compensating background gradients of the
components. The physical mechanisms underlying steady and oscillatory
convection are analyzed from the perspective of a universally consistent
understanding of the effects of different boundary conditions.Comment: V2: Submitted to and published in Annals of Physics. 59 manuscript
pages, 15 figures (occupying 21 pages). The full abstract is on the first
page. Nonessential modifications/enhancements in the presentation (more
compact presentation of the text and figure data, some style improvements,
etc.
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