Retrieving "Circulation (fluid Dynamics)" from the archives
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Vortex
Linked via "circulation ($\Gamma$"
Mathematical Description and Topology
The mathematical description of a vortex often relies on the concept of the circulation ($\Gamma$/)), which is the line integral of the fluid velocity $\mathbf{v}$ around a closed loop $C$ encircling the vortex core:
$$\Gamma = \oint_C \mathbf{v} \cdot d\mathbf{l}$$