Shear and Mixing in Oscillatory Doubly Diffusive Convection
Shear and Mixing in Oscillatory Doubly Diffusive Convection
复制标题
振荡双扩散对流中的剪切和混合
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
S. Talon
中科院分区：
文献类型：
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作者：
F. Paparella;E. Spiegel;S. Talon
为了研究振荡双扩散（ODD）对流中的混合机理，我们截断了Boussinesq方程的水平模态展开，得到了该过程的简化模型。在具有低普朗特数的天体物理学有趣的情况下（传统上称为半对流），像普通热对流一样产生大规模剪切。剪切和振荡对流之间的相互作用产生了具有显著混合的流体的间歇性倾覆。相比之下，在适合于海水的参数区，对流不产生大尺度流动。然而，如果这种流动是从外部施加的，则会观察到间歇性的倾覆，并伴有增强的混合。
To investigate the mechanism of mixing in oscillatory doubly diffusive (ODD) convection, we truncate the horizontal modal expansion of the Boussinesq equations to obtain a simplified model of the process. In the astrophysically interesting case with low Prandtl number (traditionally called semiconvection), large-scale shears are generated as in ordinary thermal convection. The interplay between the shear and the oscillatory convection produces intermittent overturning of the fluid with significant mixing. By contrast, in the parameter regime appropriate to sea water, large-scale flows are not generated by the convection. However, if such flows are imposed externally, intermittent overturning with enhanced mixing is observed.