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arXiv 2107.07779cond-mat.soft
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曲面上的主动线虫动力学--几何力对拓扑缺陷运动模式的影响

Active nematodynamics on curved surfaces -- the influence of geometric forces on motion patterns of topological defects

Michael Nestler, Axel Voigt

摘要:

我们推导并数值求解了一个表面活性线虫动力学模型。我们在球体上验证了数值方法,并分析了流体动力学对拓扑缺陷振荡运动的影响。对于椭圆形表面的几何力对这些运动模式的影响是通过考虑到内在的和外在的曲率贡献的影响。数值实验表明,更强的耦合与几何特性,如果外部曲率的贡献,并提供了一种可能性,以调整流动和缺陷运动的表面特性。

英文摘要:

We derive and numerically solve a surface active nematodynamics model. We validate the numerical approach on a sphere and analyse the influence of hydrodynamics on the oscillatory motion of topological defects. For ellipsoidal surfaces the influence of geometric forces on these motion patterns is addressed by taking into account the effects of intrinsic as well as extrinsic curvature contributions. The numerical experiments demonstrate the stronger coupling with geometric properties if extrinsic curvature contributions are present and provide a possibility to tune flow and defect motion by surface properties.

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