D124 多層格子法磁気流体力学シミュレーションで探る星形成過程

概要

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In star formation process, gas density increases from the molecular cloud density to the stellar one. According to this change, the characteristic scale decreases from the size of molecular cloud cores∿10^<17>cm to the stellar radius∿10^<11>cm. In this star forming process, there are long-standing problem to be solved : stellar magnetic flux problem and stellar angular momentum problem. These two quantities are conserved in the axisymmetric ideal MHD regime, but those observed for stars are much smaller than those of parents clouds. The first is solved by the magnetically accelerated outflow remove the angular momentum. And the Joule dissipation of magnetic flux seems to resolve the latter problem. To cover the large dynamic range, we employ the nested-grid scheme, which ensures both fine resolution near the new born star and wide coverage far from the star.
日本流体力学会の論文
2002-07-23