COHERENT VORTICITY HOLES FROM 2D TURBULENCE DECAYING IN A BACKGROUND SHEAR-FLOW

被引：37

作者：

HUANG, XP ^{[1
]}

FINE, KS ^{[1
]}

DRISCOLL, CF ^{[1
]}

机构：

[1] UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 74卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.74.4424

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Freely decaying 2D turbulence in magnetized electron columns has been measured using a phosphor screen/CCD camera diagnostic. The relaxation towards axisymmetric equilibrium is hindered by medium-sized coherent vorticity holes which persist for hundreds of column rotations despite the strong negative rotational shear. These holes tend to settle into symmetric configurations in the column, give a negative skew to the measured vorticity fluctuations, and are eventually destroyed due to a slow outward radial creep. © 1995 The American Physical Society.

引用

页码：4424 / 4427

页数：4