Viscous dissipation and dynamics in simulations of rotating, stratified plane-layer convection
Viscous dissipation and dynamics in simulations of rotating, stratified plane-layer convection
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旋转、分层平面层对流模拟中的粘性耗散和动力学
DOI：
10.1093/mnras/stae240
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发表时间：
2024
影响因子：
4.8
通讯作者：
Lance S
中科院分区：
文献类型：
--
作者：
Lance S
恒星和行星中的对流必须保持抵抗粘性和欧姆耗散。在这里，我们提出了第一个系统的调查粘性耗散模拟旋转，密度分层的平面层对流。我们的模拟考虑滞弹性理想气体，并采用开源代码Dedalus。我们表明，当对流是足够有力的，集成耗散加热趋向于一个值，是独立的粘度或热扩散率，但取决于所施加的光度和分层。我们表明，知识的耗散提供了一个约束的动能通量的大小在对流区。在我们的简单流场的非旋转情况下，大部分耗散发生在最高可能温度附近，动能通量接近这个界限。在旋转的情况下，虽然总的综合耗散是相似的，它是更均匀地分布（和局部平衡的工作对分层），因此较小的动能通量。在我们的旋转模拟的热传输是在良好的协议与先前获得的三维Boussinesq对流的结果，并接近无扩散理论的预测。
Convection in stars and planets must be maintained against viscous and Ohmic dissipation. Here, we present the first systematic investigation of viscous dissipation in simulations of rotating, density-stratified plane layers of convection. Our simulations consider an anelastic ideal gas, and employ the open-source code Dedalus. We demonstrate that when the convection is sufficiently vigorous, the integrated dissipative heating tends towards a value that is independent of viscosity or thermal diffusivity, but depends on the imposed luminosity and the stratification. We show that knowledge of the dissipation provides a bound on the magnitude of the kinetic energy flux in the convection zone. In our non-rotating cases with simple flow fields, much of the dissipation occurs near the highest possible temperatures, and the kinetic energy flux approaches this bound. In the rotating cases, although the total integrated dissipation is similar, it is much more uniformly distributed (and locally balanced by work against the stratification), with a consequently smaller kinetic energy flux. The heat transport in our rotating simulations is in good agreement with results previously obtained for 3D Boussinesq convection, and approaches the predictions of diffusion-free theory.
太阳的磁流体动力学
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
J. Quenby
通讯作者：
J. Quenby