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Higher-dimensional Euler fluids and Hasimoto transform: counterexamples and generalizations
Nonlinearity ( IF 1.7 ) Pub Date : 2021-03-09 , DOI: 10.1088/1361-6544/abe1d1
Boris Khesin 1 , Cheng Yang 2, 3
Affiliation  

The binormal (or vortex filament) equation provides the localized induction approximation of the 3D incompressible Euler equation. We present explicit solutions of the binormal equation in higher-dimensions that collapse in finite time. The local nature of this phenomenon suggests a possibility of the singularity appearance in nearby vortex blob solutions of the Euler equation in 5D and higher. Furthermore, the Hasimoto transform takes the binormal equation to the NLS and barotropic fluid equations. We show that in higher dimensions the existence of such a transform would imply the conservation of the Willmore energy in skew-mean-curvature flows and present counterexamples for vortex membranes based on products of spheres. These (counter)examples imply that there is no straightforward generalization to higher dimensions of the 1D Hasimoto transform. We derive its replacement, the evolution equations for the mean curvature and torsion form for membranes, thus generalizing the barotropic fluid and Da Rios equations.



中文翻译:

高维欧拉流体和 Hasimoto 变换:反例和推广

binormal(或涡丝)方程提供了 3D 不可压缩欧拉方程的局部感应近似。我们在有限时间内崩溃的高维中提出了双正态方程的显式解。这种现象的局部性质表明,在 5D 和更高维度的欧拉方程的附近涡团解中可能出现奇点。此外,Hasimoto 变换将副正规方程用于 NLS 和正压流体方程。我们表明,在更高的维度中,这种变换的存在意味着偏斜平均曲率流中威尔莫尔能量的守恒,并提出了基于球体产品的涡旋膜的反例。这些(反)示例意味着没有直接推广到一维 Hasimoto 变换的更高维度。我们推导出它的替代,膜的平均曲率和扭转形式的演化方程,从而推广了正压流体和 Da Rios 方程。

更新日期:2021-03-09
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