标题： 弱分层旋转磁对流中的各向异性湍流 显示英文标题

标题： Anisotropic turbulence in weakly stratified rotating magnetoconvection

摘要： 对描述笛卡尔箱中旋转磁流体的三维MHD方程进行数值模拟，使用代码NIRVANA。计算由小尺度波动共同作用引起的平均量如湍流强度和湍流热通量的特征。湍流的相关长度显著依赖于磁场的强度和方向，以及由科里奥利力和洛伦兹力引起的湍流强度的各向异性行为，在更快旋转时更为明显。在小尺度上各向同性行为的发展——如在纯旋转对流中观察到的——即使在弱磁场下也会消失，导致以垂直分量为主的湍流流动。在存在水平磁场的情况下，垂直湍流热通量随着磁场强度的增加而略有增加，从而有助于旋转系统的冷却。热量的水平输运总是朝向西方和极地。后者可能是大尺度纬向流动的来源，而前者在热通量非轴对称边界条件的情况下对全球模拟可能很重要。 显示英文摘要

摘要： Numerical simulations of the 3D MHD-equations that describe rotating magnetoconvection in a Cartesian box have been performed using the code NIRVANA. The characteristics of averaged quantities like the turbulence intensity and the turbulent heat flux that are caused by the combined action of the small-scale fluctuations are computed. The correlation length of the turbulence significantly depends on the strength and orientation of the magnetic field and the anisotropic behavior of the turbulence intensity induced by Coriolis and Lorentz force is considerably more pronounced for faster rotation. The development of isotropic behavior on the small scales -- as it is observed in pure rotating convection -- vanishes even for a weak magnetic field which results in a turbulent flow that is dominated by the vertical component. In the presence of a horizontal magnetic field the vertical turbulent heat flux slightly increases with increasing field strength, so that cooling of the rotating system is facilitated. Horizontal transport of heat is always directed westwards and towards the poles. The latter might be a source of a large-scale meridional flow whereas the first would be important in global simulations in case of non-axisymmetric boundary conditions for the heat flux.