Week 2 Challenge : Surface meshing on a Pressure valve

Aim: Check for geometrical errors and perform topology cleanup

Procedure:

1. Topo is used for topographic clean-up
2. To check geometry: Checks→Geometric→ANSA Checks(template)→errors will be shown(they should be cleared)
3. By choosing every error the assigned hot points will be emphasized in the model
4. Single cons represented by red colour lines
5. Hide double and triple ons and press ctrl+shift+enter to just see single cons
6. Faces and surfaces in topo mode are used to clear the errors
7. To create faces on single cons in the existing surface: Face→New→Existing surface
8. Loop is used to select all the cons which are connected in the loop using a single click
9. Fits and coons are also used to create surface
10. Planar option can only be used for single-plane
11. Fill hole can be used to fill circular, rectangular holes
12. ENT is used to choose cones one by one and the fitted option can be used later
13. In wireframe mode, a single cone must be selected by double-click
14. Select cons with the same length for ENT
15. To make a cylindrical surface, ENT is used
16. For CFD analysis, the surface should be closed
17. The bottom of the valve is closed even though there were no errors resulting in a triple cone
18. Delete some cuts(cut→Right click) So that the mesh size will be lesser than the distance between cuts
19. To create a new PID: Properties→Right Click→New→PSHELL
20. After creating some PID next step is assigning them
21. To assign PID: Right-click on opening properties→Apply→choose surface→Middle chick
22. If PID is used for selection it will select PID wise
23. PID Region is used to select the surface until there is a break
24. Inlet and outlet can be assigned directly
25. Select body PID using PID region selection and OR operation
26. Spring, Base surface, and valve head PIDs are added
27. Base surface selected with ENT
28. spring selected with PID Region
29. valve head is assigned using ENT
30. Lock is used to lock the view
31. The rest of the model is assigned as column PID
32. Pick option when enabled can be used to know the PID when the surface is chosen
33. First neighbor option is used to know where an unknown surface is
34. If bulb is partially turned on some surface in the PID is visible
35. If the bulb is not getting turned on, there is nothing in that PID
36. Delete the unwanted PID using right click→Delete
37. Fit in can be used to properly place the model
38. Gliching indicates overlapped surfaces
39. Undelete option is used to recover any deleted surface and topo is used to join the surfaces
40. If triple cons are present check if there is any overlap
41. While meshing, give 5 mm in length to both the macro and perimeter
42. Give length 5mm in mesh parameters
43. Check quality criteria
44. Then use spot Mesh to mesh
45. Mesh by ENT or PID or PID Region
46. By hiding undesired faces, the surfaces can be meshed by soptmesh→Visible
47. Mesh all the surface or PID
48. Change mesh length in mesh parameters, and macro and perimeter length in every different model while giving different mesh lengths each time. Check quality criteria to see if maximum and minimum length are contradicting. And clear them suitably.

Learning outcome: Geometric clean-up using topo and meshing(2D)

Result: Each model looks different with a different mesh length(target length). The finer the better. Smaller Mesh lengths can copy most of the details of the model.

Conclusion: Target length must justify each and every component. If the target length is small, more elements will be present. And a nice surface finish is attained. Geometry must be obeyed by mesh elements. Spring is captured with nice features in 1 mm target length than 3 mm and 5mm. Different parts can have different target lengths in the same model.

*Unable to save the model after inserting images in the middle of the report. Kindly refer them in the attached session.

**The solution zip file is named as "challenge 2 Answer"