Partition smoothing error in Fluent dynamic mesh

- June 11, 2020 at 3:51 pm
  
  teoman
  Subscriber
  
  Hi Everbody
  
  I have modeled an helicopter with four blades.I used UDFs to define blade's pitching and flapping motion with Define_CG_Motion ,naturally.
  
  And I gave the rotation of blades by Mesh Motion.While performing a compressible transient solution Fluent gives the attached error after some time-step.
  
  Fluent looses connection node's coordinates while repartitioning..(Metis)
  
  Has anyone experienced such a problem.?
  
  Thanks a lot
  
  Teoman
- June 14, 2020 at 3:03 pm
  
  RK
  Ansys Employee
  
  Hello,
  
  As Ansys employees, we will not be able to view attached files, can you please insert them as an image? Thanks!
- June 14, 2020 at 5:40 pm
  
  teoman
  Subscriber
  
  Dear Rahul
  
  I have noticed that The main problem is , while 4 bladed prop was making pitching and flapping in the mesh motion zone ,blades come too much close to
  
  the mesh motion zone then repartition becomes necessary.
  
  I figured out that my UDF's (cg_motion) rotation axis does not match with the rotor disc (mesh motion zone) rotation axis .
  
  Mesh Motion rotation axis ; ( x= -0.07846 ,y=0.99692 , z=0 )
  
  Despite UDF Manual says cg_motion uses local referance frame (that is why I used inclined plan to design rotor disc in DM) , But it is rotating about global ref frame. Y axis.
  
  Please see the picture below.
  
  Many thanks and regards
  
  Teoman