paraview 水流绕柱2d 计算升阻力

简单记录一下，主要是filter的应用
details：
computational domain of size is [0, 2.2] × [0, 0.41].
The centre of the cylinder is located at (0.2, 0.2).
cylinder diameter (L) is 0.1 units.

Process

1. 加载.vtu 文件组
2. Filter-> ExtractSurface: 提取外表面
3. Filter-> FeatureEdges: 从输入数据集中提取边缘子集
4. Filter-> Clip: 把圆柱切出来
   Clip Type: Sphere
   Point Cloud Parameters: Center[0.2, 0.2, 0], Radius[0.05]
5. Filter-> Calculator:
   Lift: 升力，计算出压力在y轴方向的投影
   Result Array Name: Lift Force
   
   Drag: 阻力，计算出压力在x轴方向的投影
   Result Array Name: Drag Force
   
6. FIlter-> IntegrateVariables
7. File-> Save Data
   勾选Write Time Steps 和 Add Time Step
   完成