Dynamo efficiency in compressible convective dynamos with and without penetration

Dynamo efficiency in compressible convective dynamos with and without penetration
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有和没有穿透的可压缩对流发电机的发电机效率

DOI:
10.1080/03091929.2010.495067
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发表时间:
2010
影响因子:
1.3
通讯作者:
Brummell N
Brummell N
中科院分区:
地球科学4区
文献类型:
--
作者:
Brummell N

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我们通过在笛卡尔区域中的数值模拟来研究可压缩对流中的发电机作用。我们直接比较发电机的完全对流域与相同的域扩展到包括一个基本的稳定区域的属性。这些模拟扩展了具有开放下边界条件的完全对流域模型,使其成为一个更加自洽的模型。我们研究是否非常缓慢的回流的低区域影响发电机在对流区的属性。我们发现,发电机的上部对流区的性质基本上是不变的,通过添加较低的稳定区域。经过一段过渡期后,对流区的发电机作用不仅照常进行,而且还扩展到稳定区的过冲区。向下的磁泵,长的再循环时间和低百分比的上升元素,过境的垂直范围的域都未能消除发电机。足够的磁场被再循环或保留在对流区,以给当地的发电机提供燃料。对流层与低层条件的独立性使发电机真正成为局部的。
We investigate dynamo action in compressible convection via numerical simulations in a Cartesian domain. We directly compare the dynamo properties of a fully convective domain with the same domain extended to include an underlying stable region. These simulations extend models of fully convective domains with open lower boundary conditions to a more self-consistent model. We examine whether the extremely slow recirculation of the lower region affects the dynamo properties in the convection zone. We find that the dynamo properties of the upper convective region are essentially unchanged by the addition of the lower stable region. After a transient period, dynamo action in the convective region not only proceeds as normal, but also extends into the region of overshooting flow in the stable region. Downward magnetic pumping, long recirculation times and the low percentage of rising elements that transit the vertical extent of the domain all fail to eliminate the dynamo. Sufficient magnetic field is recirculated or remains in the convective region to fuel the local dynamo there. The independence of the convective layer from the conditions of the lower layer makes the dynamo truly local.
DOI: 10.1086/175800
发表时间: 1995-06
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影响因子: --
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