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arXiv 2110.09079math.APmath-phmath.MP
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反平行轴对称流的涡拉伸

On vortex stretching for anti-parallel axisymmetric flows

Kyudong Choi, In-Jee Jeong

摘要:

在$\mathbb{R}^3$中考虑轴对称无旋不可压无粘流动,假设轴向涡量在上半空间为非正,在末级坐标为奇数,这对应于反平行涡环迎面碰撞的流动设置。对于任何这样的数据,我们建立单调性和无限增长的涡脉冲上半空间。作为应用,我们在$\mathbb{R}^{3}$中实现了某些经典/光滑和紧支撑涡度解的Sobolev范数的无限增长。

英文摘要:

We consider axisymmetric incompressible inviscid flows without swirl in $\mathbb{R}^3$, under the assumption that the axial vorticity is non-positive in the upper half space and odd in the last coordinate, which corresponds to the flow setup for head-on collision of anti-parallel vortex rings. For any such data, we establish monotonicity and infinite growth of the vorticity impulse on the upper half-space. As an application, we achieve infinite growth of Sobolev norms for certain classical/smooth and compactly supported vorticity solutions in $\mathbb{R}^{3}$.

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