Collapse of vortex lines in hydrodynamics

Collapse of vortex lines in hydrodynamics
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流体动力学中涡线的塌陷

DOI:
10.1134/1.1326970
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发表时间:
2000
影响因子:
1.1
通讯作者:
V. Ruban
V. Ruban
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
E. Kuznetsov;V. Ruban

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提出了一种新的机制崩溃的流体动力学与“破碎”的涡线。这种坍缩导致涡量场的点奇点的形成,即,广义动量旋度在坍缩点,|Ω|随着((t0 − t)−1的增加而增加,其在t → t0的空间分布接近于准二维:在“软”方向上,收缩遵循l1 →(t0 − t)3/2定律,而在另外两个“硬”方向上,收缩遵循l2 →(t0 − t)1/2定律。它已被证明,这种崩溃的情况下发生在一般情况下的三维可积流体动力学与哈密顿量|Ω|博士
A new mechanism is proposed for collapse in hydrodynamics associated with the “breaking” of vortex lines. The collapse results in the formation of point singularities of the vorticity field, i.e., a generalized momentum curl. At the point of collapse the vorticity |Ω| increases as ((t0 − t)−1 and its spatial distribution for t → t0 approaches quasi-two-dimensional: in the “soft” direction contraction obeys the law l1 → (t0 − t)3/2 whereas in the other two “hard” directions it obeys l2 → (t0 − t)1/2. It has been shown that this collapse scenario takes place in the general case for three-dimensional integrable hydrodynamics with the Hamiltonian ℋ = ∫|Ω| dr.
DOI: 10.1063/1.868166
发表时间: 1994-08-01
期刊: PHYSICS OF FLUIDS
影响因子: 4.6
作者:
BORATAV, ON;PELZ, RB
通讯作者: PELZ, RB