E345 回転球殻内の熱対流シミュレーションにおける有限要素格子の影響
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概要
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For investigation of dynamics in the Earth's outer core, we have been developing a simulation code for motion of a fluid in a rotating spherical shell based on Thermal-Hydraulic subsystem of GeoFEM, which gives a finite element method (FEM) platform for massively parallel computers. When we carry out the simulations using FEM, simulation results often depends on grid patterns. To investigate the effect of the grid patterns on the convection, we carry out simulations of the thermal convection in the rotating spherical shell with two types of grid patterns; that is, one of the grid pattern is refined from icosahedron (Mesh (A)) and another is that based on cubic shape (Mesh (B)). Both grids are set on a sphere surface with above patterns, and these spheres are stacked in radial direction. As parameters of the simulations, we follow the Dynamo benchmark test organized by Christensen et. al. (2001). The result shows that grid patterns have large effects on the drift velocity of the convection pattern in the case with the Mesh (B). That is, although 4 pairs of the convection columns are generated in the both cases, the drift frequency decreases exponentially throughout the simulation in the case with Mesh (B), while the drift frequency reaches constant by t=0.4 in the case with Mesh (A). This result shows that grid pattern affects strongly to propagation of the convection pattern when the wave number of the dominant convection is the same with that of the grid pattern.
- 日本流体力学会の論文
- 2001-07-31
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関連論文
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- E345 回転球殻内の熱対流シミュレーションにおける有限要素格子の影響