在地磁涡流中心处有成束的地磁线穿过表面。
There are bundles of meridians breaking through the surface at the center of this vortex.
基于多重线涡模型（MLVM），本文建立了一种计算机时少、收敛性强的适用于大迎角涡流势流数值模拟的迭代算法。
A robust iterative method suitable for the numerical simulation of vortex flows at high angles-of-attack is established based upon the multiple line-vortex model (MLVM).
螺旋气道通过气门间隙与缸壁的气流相互作用也产生涡流，因此，涡流数取决于相应气缸中心的螺旋线方位。
Helical port also produces swirl by airflow interaction of valve gap and cylinder wall, so swirl number depends on helical line direction of relevant cylinder center.
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