5-4 GeoFEM による地球磁場成因解明のための電磁流体シミュレーション

概要

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We have developed a simulation code for MHD dynamo in a rotating spherical shell using the GeoFEM platform, which serves simulation platforms using the finite-element method (FEM). To connect the magnetic field between the conductive fluid and insulator, a finite element mesh is set from the center to 5 times of the Earth's radius. Furthermore, the vector potential of the magnetic field with the Coulomb gauge is treated to solve the magnetic field. We performed a MHD simulation in a rotating hemispherical shell using the present code, and results are compared with the dynamo benchmark test by Christensen (2001). We performed the simulation with 3 finite element mesh which have different spatial resolution on a sphere. The results shows that the solutions have approximately 5% differences from Christensen's solution, but the differences become small with finer mesh. We conclude that the present simulation code represents consistent results.
一般社団法人日本機械学会の論文
2002-10-30