Week 2 Challenge : Surface meshing on a Pressure valve
Aim : To perfrom topology cleanup along with geometric errors by setting up three different target lengths for three different cases.
Prerequisite: Target lengths are 1mm,3mm,5mm
Element type is Tria
Workflow:
- Fix the geometric errors by patching the surfaces
- Close all the holes and openings
- Clean up geometry by cleaning topology cons and errors
- Assign PID to inlet,outlet ,casing of the model and other parts
- Move to mesh module and apply length parameters for three different lengths
- finish the meshing process after setting up mesh parameters
Geometry:
The geometry provided:
Fix the errors by patching the surfaces:
Patch the surfaces
Check for errors:
Clean the geometry after patching:
The surface after patch has perimeter lines so its necessary for clean up.
Assign PID's to the model:
- inlet
- Outlet
- spring
- casing
- column
- head
Length parameters:
In mesh section
Apply length to the model
Target Length are 1mm ,3mm and 5mm
Mesh parameters for Target length 1mm ,3mm,5mm:
The parametrs are set to tria elment
1st order scheme
Results for three different Target Lengths after spot mesh
for 1mm
for 3mm
For 5mm:
Results:
Trias for 1mm: 189676
Trias for 3mm: 23914
Trias for 5mm: 8822
Comparision of Results:
- It is evident that 1mm mesh size gives the best results
- 3 mm mesh size is good but the spring dint mesh properly due to the size provides.
- The spring size is small and the length parameter with 3mm and 5mm will give bad mesh and the quality falls.
- The tower head and casing also has deformities with 3mm and 5mm mesh.
Discussion:
To avoid the bad mesh we can change the length paramater for different parts in the model. So each and every part can have its own mesh target length which will give good mesh.
For larger surfaces larger target length can be used to save number of tria elements and where necessary we can decrease the target lenght size for smaller surface sizes.
Ansa files compressed:
https://drive.google.com/file/d/1X6rd0kDJBXpOVDDIRMK7lwjBB-Tsdg-X/view?usp=sharing