Sizing the Mesh

We will learn how to use Ansys Meshing to mesh the wing here. In this video, we will discuss the importance of mesh sizing. We will use the body and face sizing options in Ansys Meshing. Moreover, we will also be learning about using the Body of Influence setting for mesh refinement. Finally, we will create an inflation layer mesh which will be used to capture the flow physics at the boundary layer.

Summary of the above video:
  1. Change units to US Customary (ft)
  2. Add Body Sizing
  3. Mesh → Mesh Control → Sizing
  4. Select Body of Influence
  5. Sizing → .3 ft
  6. Hide Body of Influence Geometry
  7. Add Face Sizing at Leading Edge
  8. Mesh → Mesh Control → Sizing
  9. Select leading edge face
  10. Element Size = .01 ft
  11. Repeat (3) for Trailing-Edge Face
  12. Element Size = .01 ft
  13. Repeat (3) for Middle Face
  14. Element Size = .03 ft
  15. Repeat (3) for Bottom Face
  16. Element Size = .03 ft
  17. Add Inflation Layers
  18. Total Thickness = .006 ft
  19. Post Inflation Algorithm

We add our body of influence to better refine around the wing, and we can control how large or how small the refinement is with the size of the body. We can also control the element size in this body of influence and how quickly the transition is from the body of influence sizing is. For this coarse mesh, we set the behavior to hard when performing the edge sizing, but it is not necessary; we set it to hard because later when we want to refine the mesh (in the Verification and Validation lesson) we will use element sizes that fall below the default size for our coarse relevance center and if we were to leave the behavior at soft, the mesher would only reduce the element size to the default minimum element size.