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arXiv 2007.06513physics.flu-dyn
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Kolmogorov流:极小低维模型中的线性稳定性和能量转移

Kolmogorov flow: Linear Stability and Energy Transfers in a minimal low-dimensional model

Soumyadeep Chatterjee, Mahendra K. Verma

摘要:

本文利用Galerkin截断和Craya-Herring基对速度场进行分解,导出了Kolmogorov流的四模模型。在此之后,我们进行了分岔分析的模型。虽然我们的低维模型比过去的模型有更少的模式,它捕捉的基本特征的主要分支的Kolmogorov流。例如,它再现了超临界音叉分叉的临界雷诺数和过去工作的流动结构。我们还演示了从中间尺度到大尺度的能量转移。我们进行直接数值模拟的Kolmogorov流,并表明我们的模型预测与数值模拟非常匹配。

英文摘要:

In this paper, we derive a four-mode model for the Kolmogorov flow by employing Galerkin truncation and Craya-Herring basis for the decomposition of velocity field. After this, we perform a bifurcation analysis of the model. Though our low-dimensional model has fewer modes than the past models, it captures the essential features of the primary bifurcation of the Kolmogorov flow. For example, it reproduces the critical Reynolds number for the supercritical pitchfork bifurcation and the flow structures of the past works. We also demonstrate energy transfers from intermediate scales to large scales. We perform direct numerical simulations of the Kolmogorov flow and show that our model predictions match with the numerical simulations very well.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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