Impact of domain anisotropy on the inverse cascade in geostrophic turbulent convection
Impact of domain anisotropy on the inverse cascade in geostrophic turbulent convection
复制标题
域各向异性对地转湍流对流逆级联的影响
DOI：
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发表时间：
2017
影响因子：
3.7
通讯作者：
Meredith Plumley
中科院分区：
文献类型：
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作者：
K. Julien;E. Knobloch;Meredith Plumley
研究了区域各向异性对快速旋转Rayleigh-Bénard对流的地转湍流区内逆级联的影响。在水平方向具有正方形截面的周期磁区中，存在磁区填充偶极子状态。对于矩形周期区域，观察到与短边平行的Kolmogorov流动，该流动由周期性的嵌入涡旋的单向射流阵列组成，并伴随着底层的弱弯曲横向射流。在外加小幅度噪声驱动的弱耗散二维流和经典静力地转湍流中发生的类似转变是能量无粘性守恒和位能拟能的结果，可以用统计力学的考虑来解释。旋转Rayleigh-Bénard对流代表了一个重要的三维系统，它只有一个无粘不变量，但它仍然表现出由内在涨落驱动的大尺度结构。
The effect of domain anisotropy on the inverse cascade occurring within the geostrophic turbulence regime of rapidly rotating Rayleigh–Bénard convection is investigated. In periodic domains with square cross-section in the horizontal, a domain-filling dipole state is present. For rectangular periodic domains, a Kolmogorov-like flow parallel to the short side and consisting of a periodic array of alternating unidirectional jets with embedded vortices is observed, together with an underlying weak meandering transverse jet. Similar transitions occurring in weakly dissipative two-dimensional flows driven by externally imposed small-amplitude noise and in classical hydrostatic geostrophic turbulence are a consequence of inviscid conservation of energy and potential enstrophy, and can be understood using statistical mechanics considerations. Rotating Rayleigh–Bénard convection represents an important three-dimensional system with only one inviscid invariant which nonetheless exhibits large-scale structures driven by intrinsically generated fluctuations.
旋转瑞利-贝纳德对流中的射流和大尺度涡旋
影响因子：
2.7
作者：
Guervilly C
通讯作者：
Guervilly C