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The vortex is a common phenomenon in fluid field. In this paper, vortex can be rcpresented by curvaturec, which varies with are length s. The variance of point (x,y) with are length in stream line satisfies a 2-order variable-coefficient linear ordinary differential equation. The type vortex can be analyzed qualitatively by this ordinary differentialequation.
The variance of point (x, y) with length in stream line satisfies a 2-order variable- coefficient linear ordinary differential equation. The type vortex can be analyzed qualitatively by this ordinary differentialequation.