Author: Akira Kageyama,

Title: "Dynamo Simulation by Earth Simulator"

IUGG2003, Sapporo, Japan, (2003, June)



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key words: geodynamo, MHD, self-organization
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abstract
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DYNAMO SIMULATION BY EARTH SIMULATOR
Akira KAGEYAMA (Earth Simulator Center, Japan Marine Science and Technology)

From 1990's, we have been performed a series of computer simulations of MHD dynamo in
rotating spherical shells. Since our initial motivation was to see the geomagnetic field as one
of the self-organization phenomena in nature, we approached to the geodynamo as a
fundamental problem of MHD physics. So, we tried to keep our dynamo model as simple as
possible, in order to extract essential physics of the MHD dynamo process. Another obvious
reason of such a simplifed model (and with non-realistic parameters) was the limitation of the
available computer power. In 2002, the author moved to the Earth Simulator Center, Japan,
which has the world's fastest computer, called the Earth Simulator (ES). The ES is a vector-parallel
type supercomputer that has 640 processor nodes, each consisting of 8 vector
processors. The peek speed of ES is 40TFlops and the momory size is 10TB. This
tremendous power of ES enables us to attack the geodynamo probelm with more realistic
simulation model as well as much more higer (or lower) nondimensional parameters. We
have been endeavored to convert and improve our dynamo simulation model (and the code)
to be highly optimized to the vector-parallel architecture of ES. In this paper, we will report
our new simulation results obtained by ES.