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arXiv 2510.02461cond-mat.soft
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活性固体中的湍流动力学

Turbulent Dynamics in Active Solids

NTNU – Norwegian University of Science and Technology(挪威科技大学)

Wilhelm Sunde Lie, Ingve Simonsen, Paul Gunnar Dommersnes

AI总结:

研究发现自推进二维弹性薄片中存在固体湍流动力学,表现出能量谱的幂律特性及非高斯统计,但无能量级联,拓展了活性湍流在固态活性物质中的应用。

摘要:

湍流最常与高雷诺数流相关联,然而湍流动力学的框架已被扩展到许多其他领域,如磁流体动力学湍流、固体中的弹性波湍流,以及最近的低雷诺数生物流体中的活性湍流。在这里,我们报告了一种在自推进的二维弹性薄片中出现的固体湍流动力学形式。我们证明在活性弹性固体模型(AES)中,极性有序动力学表现出湍流动力学的典型特征:能量谱的幂律标度和速度增量的非高斯统计。然而,没有能量级联,这与之前在流体中活性湍流的研究结果一致。这些结果将活性湍流的概念扩展到固态活性物质,并可能对理解生物活性固体中的集体动力学,如细菌群落和上皮细胞层具有重要意义。

英文摘要:

Turbulence is most commonly associated with high Reynolds number flow, however the framework of turbulent dynamics has been conceptually extended to many other fields, such as magnetohydrodynamic turbulence, elastic wave turbulence in solids, and more recently to low Reynolds number active turbulence in biological fluids. Here we report a form of solid turbulent dynamics in a self-propelled two-dimensional elastic sheet. We show numerically that the polar ordering dynamics in the active elastic solid model (AES) exhibit hallmark features of turbulent dynamics: power-law scaling of the energy spectrum and non-Gaussian statistics of velocity increments. However, there is no energy cascade, in line with previous findings for active turbulence in fluids. These results extend the concept of active turbulence to solid-state active matter, and can be important for understanding collective dynamics in biological active solids such as bacterial colonies and epithelial cell layers.

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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