The desingularization smoothing parameter is introduced in calculating the induced velocity on trailing vortex surface.

在诱导速度计算中引入了非奇异光滑参数。

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Moving path lines, tangential and axial average velocities of particles at the vortex surface are obtained by the photography method.

通过摄像法得出了旋涡表面流体质点的运动轨迹、切向和轴向时均速度。

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The coordinates of grids on the wing surface and dipole strength on the trailing vortex surface were changed with respect to time-stepping.

翼表面网格坐标和尾涡面上的偶极强度随时间步进变化。

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The vortex generators themselves are pins or vanes that protrude from the surface and set up microscopic eddies in the boundary layer.

ECONOMIST: The turbulent world of swimming

They say there is particular concern over the very long-lived northern low pressure zone of circumpolar winds, called a vortex, found at between 13 and 34 km (8 and 21 miles) above the Earth's surface.

BBC: By Environment Correspondent Alex Kirby