VORTEX DYNAMICS 1. Introduction
function in the plane, and the induced velocity is obtained from the Biot-Savart law. For a point vortex at the origin this reduces to the radial velocity fleld u(x)=K2d ⁄– = K2d(x). Corresponding particle trajectories are shown in Fig. 2(a). The particle speed juj =1=r increases unboundedly as the vortex center is
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