2011 Fiscal Year Final Research Report
Low viscosity dynamo simulations by a high-order and high-accuracy scheme
| Project/Area Number |
22740292
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2010 – 2011
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| Keywords | 地球ダイナモ / 数値シミュレーション |
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| Research Abstract |
In order to understand the mechanisms and dynamics of the geomagnetic field generation process, we developed a new high-order, high-accuracy code for numerical simulation of the geodynamo. First we confirmed validity of the code by solving a dynamo benchmark problem. Then, we reproduced a dynamo solution in a low-viscosity, strong magnetic field regime, where the large-scale flow structure is preferred due to effects of the strong magnetic field as well as thin sheet-like plumes. We found a characteristic flow structure, by which the strong magnetic field is generated, by a detailed analysis of magnetic field generation process developed in this study. In addition, based on high-pressure, high-temperature experimental results, we showed a possibility of two-layered structure of the Earth's core.
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