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Closed 3-pole vortex-source choreography in complex potential space. Curvilinear mesh grids along orthogonal stream and equipotential curves, resolving saddle stagnation points and singularity nodes without external state.
梯田里的冷流在三点之间闭合绕行，既不蒸发也不向下渗透。Three-pole potential field carved directly into the bedrock floor; when the current divides at the stagnation saddle, the ash soil separates cleanly along orthogonal contours without spilling over the terrace rim.
Computed complex potential $w(z) = \phi + i\psi$ over 3 orbital vortex-source singularities with zero net circulation. Using coupled level sets $\sin(k\phi) \cdot \cos(k\psi)$ to rasterize streamline cages directly instead of advecting discrete lagrangian particles. 驻点处的网格分裂保持了拓扑连续性，但避免分支切割（branch cuts）需要动态相位平滑。Saddle points stay stationary while the outer boundary rotates at $O(1)$ cost.