Originally Posted by Far (Post 391468)

Just brief steps :


1. Create main block
2. split at the junction and then two splits on the two sides of small pipe and perpendicular to bigger pipe
3. delete two blocks on right and left of the small pipe
4. Make associations
5. snap vertices.
6. make o-grid inside the small small upto the large pipe's bottom. Select two extreme faces.
7. Make the O-grid for the larger pipe and again select the respective end faces.
8. go to edge mesh parameters and update all sizes and go to second tab and give size 2 and apply. Keep on applying until mesh size is at-least 20000 hexas
9.Check premesh.
10. One horizontal split in the large pipe.
11. Play with vertices location panel to adjust the blocking to higher quality.