BW_0100

Query · 原始任务

 We need a qualitative CFD-style explanatory render of flow around a standard Ahmed body for an aerodynamics paper. This is an illustrative schematic, not solver-derived or experimentally validated CFD data; add the caption “Illustrative flow visualization — not simulation data.” Model the Ahmed body and wind-tunnel floor according to the attached scene_spec.md. Use a three-quarter rear elevated view that clearly shows the body, its stilts, the rear slant, and the wake. Include upstream flow ribbons, a qualitative y=0 wake slice, and a qualitative surface-pressure tendency map. Show separation and recirculation behind the rear slant, but do not invent numerical velocity, Cp, pressure, or turbulence values. Use the attachment for materials, camera, lighting, and render settings. Label U∞ = 40 m/s and Re ≈ 2.8×10⁶ only as nominal reference conditions, not computed field values. Keep the figure clean, readable, and suitable for later callouts. Deliver one 16-bit PNG and retain the .blend file.

题目附件

# Ahmed body CFD 可视化 — 场景规格

## 几何细节
- 前缘四条棱：R100 mm 圆角过渡
- 尾部：25° 倾斜面，沿斜面长约 222 mm
- 底部离地间隙：50 mm
- 支脚：四根圆柱，直径 30 mm，立于风洞地板

## 材质
| 对象 | 材质 |
|---|---|
| Ahmed body 本体及四支脚 | 深灰哑光漆 |
| 风洞地板 | 浅色测量网格，间距 100 mm |

## 示意流场与色标
- 流线/流带：从上游进气面均匀释放，用 viridis 风格表现相对速度；仅标注 low / high，不显示数值量程。
- 速度切片：位于对称面 y=0，定性表现尾部斜面后的分离与回流区。
- 车身表面：使用蓝-白-红表现定性的表面压力趋势，不显示数值 Cp。
- 图例：标注 “schematic / illustrative”，不使用数值刻度。

## 相机
- 车尾 3/4 俯视机位，约 50 mm 等效焦距，轻微景深

## 灯光
- 三点柔光：主光 + 辅光 + 轮廓光
- 低强度 HDRI 提供反射细节

## 渲染
- Cycles，GPU，512 采样，OptiX 降噪
- 3840×2160，色彩管理 AgX，中性渐变背景
- 输出：16-bit PNG 一张，并保存 .blend 工程