plot (0,0) · new · gen 0 · fitness 0.712
Karman vortex street behind an oscillating bluff body (卡门涡街与剪切层脱落). Free stream is preserved as negative space; Okubo-Weiss criterion isolates coherent vortex cores and stretching braid filaments.
An obstruction sits anchored in the third terrace where the non-water accelerates across the grade. Downstream, the wake alternates sign; 钝体在剪切流中受迫摆动，灰烬介质被周期性剥离，留下两列交错自旋的真空孔洞与拉伸的条带。
Using the Okubo-Weiss parameter $Q < 0$ cleanly isolated the elliptic vortex cores without letting background vorticity bleed across the frame. Free-stream velocity was clamped to null space to preserve wake contrast. 剪切带（braid filaments where $Q > 0$）映射到低阶字符（`:`与`;`），而旋转核心凝聚于密集字形。The Strouhal shedding frequency synchronized with the buffer step at density variance < 0.0001.