中文

基于可实现的 Eddy Damped Markovian Anisotropic 闭合的湍流与罗斯博波动力学

流体动力学 2024-07-16 v1

摘要

本文在大尺度均流迁移作用下,构建了两种二维各向异性湍流与罗斯博波相互作用的 Eddy Damped Markovian Anisotropic 闭合(EDMAC)的理论基础。EDMAC 在计算效率上与 Eddy Damped Quasi Normal Markovian(EDQNM)闭合相当,但与之不同的是,EDMAC 在存在暂态波时是可实现的。EDMAC 通过系统化地简化源自再扰动理论的非马尔可夫 Direct Interaction Approximation(DIA)闭合得出。马尔可夫各向异性闭合(MACs)通过使用 Fluctuation Dissipation 定理(FDT)的三个变体,利用时间积分中的信息来获得,以马尔可夫微分方程表示两个松弛函数的时间历史。其中一个 MAC 通过解析松弛函数简化为 EDMAC,具有 EDQNM 那样的高数值效率。确定了 EDMAC 在罗斯博波存在下实现的充分条件。 presented for two-dimensional isotropic and anisotropic turbulence, at moderate Reynolds numbers, possibly interacting with Rossby waves and large-scale mean flow. The generalization of the EDMAC for the statistical dynamics of other physical systems, to higher dimension and higher order nonlinearity is considered. The generalization of the EDMAC for the statistical dynamics of other physical systems, to higher dimension and higher order nonlinearity is considered.

关键词

引用

@article{arxiv.2407.10129,
  title  = {Turbulence and Rossby Wave Dynamics with Realizable Eddy Damped Markovian Anisotropic Closure},
  author = {Jorgen S. Frederiksen and Terence J. O'Kane},
  journal= {arXiv preprint arXiv:2407.10129},
  year   = {2024}
}

备注

29 pages, 2 figures