Meshing of enclosed geometry

- March 17, 2019 at 5:58 pm
  
  Samsuraj
  Subscriber
  
  I designed a 3d turbine in solidworks and created enclosure in deaignmodeler for inlet and outlet. The meshing of the geometry when tried alone works good. But, with enclosure , I am getting error - "one or more entities failed to mesh". I am using ansys workbench fluent. Can anyone help me resolve this?
- March 18, 2019 at 10:08 am
  
  Rob
  Forum Moderator
  
  Did you subtract the solid part(s) from the enclosure? Having done that have you got any very thin regions? Use the cut plane tool in meshing to see where the mesh is poor quality, but also where it's missing. We'll also need pictures as ANSYS staff are not permitted to download attachments.
- March 19, 2019 at 3:55 am
  
  Keyur Kanade
  Ansys Employee
  
  in dm, go to tools - analysis tools - fault detection and check if geometry has any faults. if geometry has errors, you will need to correct them before meshing.
  
  did you give any local sizing?
  
  mostly with turbines, you will require some local sizing to get a good mesh distribution. using only default global sizing may give errors.
  
  https://www.youtube.com/watch?v=lMtHHVFmhj4
- March 19, 2019 at 6:14 am
  
  Samsuraj
  Subscriber
  
  Thank you for your help .. I solved the error. It was a small edge which was missing during meshing. I changed the min size and it worked.
- March 20, 2019 at 5:12 am
  
  Keyur Kanade
  Ansys Employee
  
  glad that your issue is resolved.
  
  please mark this as 'is solution' to help others on forum.
- March 20, 2019 at 4:04 pm
  
  Samsuraj
  Subscriber
  
  Hi... I got a new problem. In fluent, I got an error - " divergence in amg solver: epsilon" after some 30 iterations. Kindly help me to solve this.. as I have earlier mentioned, my model is a 3d turbine, placed inside a cylinder enclosure, which is again placed inside a box enclosure. I used k epsilon model. For meshing, I gave patch conforming tetrahedron mesh with inflation. Earlier, I tried with face meshing with edge sizing and refinement. That time also, I faced this same error.
- March 21, 2019 at 7:09 am
  
  Samsuraj
  Subscriber
  
  In addition to the previous problem, I have a new question... In a nozzle with divergence section length of 7 cm and dia of 2.5 cm, I ran the analysis for the mach 2. But, in the plots, the flow separation is not showing. It shows the full flow.. so, which cfd model can be used to see the flow separation at exit?