THE EFFECT OF ROTATION ON OSCILLATORY DOUBLE-DIFFUSIVE CONVECTION (SEMICONVECTION)
THE EFFECT OF ROTATION ON OSCILLATORY DOUBLE-DIFFUSIVE CONVECTION (SEMICONVECTION)
复制标题
旋转对振荡双扩散对流（半对流）的影响
DOI：
10.3847/1538-4357/834/1/44
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
P. Garaud
中科院分区：
文献类型：
--
作者：
R. Moll;P. Garaud
振荡双扩散对流（ODDC）是一种线性双扩散不稳定性，发生在温度不稳定（史瓦西不稳定），但化学成分稳定（勒杜稳定）的流体中。这种情况被认为在恒星和巨行星的内部非常常见，理解ODDC的热量和化学物质的传输对恒星和行星演化模型非常重要。流体不稳定的ODDC有一种趋势，形成对流热层，显着提高通量的温度和化学成分相比，微观扩散。虽然最近的一些研究都集中在研究分层和非分层ODDC的属性，很少有人解决额外的物理过程，如全球旋转影响其动态。在这项工作中，我们首先研究旋转如何影响旋转ODDC的线性稳定性。使用直接的数值模拟，然后，我们分析了分层和非分层ODDC的属性上的旋转的效果，我们研究了旋转轴的角度相对于重力的方向如何影响分层。我们发现，旋转系统可以大致分为两类的旋转强度的基础上。在更弱的旋转组的定性行为是类似于非旋转的ODDC，但强烈旋转系统成为占主导地位的旋涡是不变的旋转矢量的方向和强烈的影响运输。我们发现，每当层的形式，旋转总是起到减少热量和成分的运输。
Oscillatory double-diffusive convection (ODDC, more traditionally called semiconvection) is a form of linear double-diffusive instability that occurs in fluids that are unstably stratified in temperature (Schwarzschild unstable), but stably stratified in chemical composition (Ledoux stable). This scenario is thought to be quite common in the interiors of stars and giant planets, and understanding the transport of heat and chemical species by ODDC is of great importance to stellar and planetary evolution models. Fluids unstable to ODDC have a tendency to form convective thermocompositional layers that significantly enhance the fluxes of temperature and chemical composition compared with microscopic diffusion. Although a number of recent studies have focused on studying properties of both layered and nonlayered ODDC, few have addressed how additional physical processes such as global rotation affect its dynamics. In this work, we study first how rotation affects the linear stability properties of rotating ODDC. Using direct numerical simulations, we then analyze the effect of rotation on properties of layered and nonlayered ODDC, and we study how the angle of the rotation axis with respect to the direction of gravity affects layering. We find that rotating systems can be broadly grouped into two categories based on the strength of rotation. The qualitative behavior in the more weakly rotating group is similar to nonrotating ODDC, but strongly rotating systems become dominated by vortices that are invariant in the direction of the rotation vector and strongly influence transport. We find that whenever layers form, rotation always acts to reduce thermal and compositional transport.
影响因子：
8.7
作者：
French, Martin;Becker, Andreas;Redmer, Ronald
通讯作者：
Redmer, Ronald
影响因子：
3.2
作者：
Redmer, Ronald;Mattsson, Thomas R.;French, Martin
通讯作者：
French, Martin