The vortex is a common phenomenon in fluid field. In this paper, vortex can be represented by curvature c, which varies with arc length s. The variance of point (x, y) with arc length in stream line satisfies a 2-orde...The vortex is a common phenomenon in fluid field. In this paper, vortex can be represented by curvature c, which varies with arc length s. The variance of point (x, y) with arc length in stream line satisfies a 2-order variablecoefficient linear ordinary differential equation. The type vortex can be analyzed qualitatively by this ordinary differential equation.展开更多
文摘The vortex is a common phenomenon in fluid field. In this paper, vortex can be represented by curvature c, which varies with arc length s. The variance of point (x, y) with arc length in stream line satisfies a 2-order variablecoefficient linear ordinary differential equation. The type vortex can be analyzed qualitatively by this ordinary differential equation.