Adaptive meshing in mechanical apdl

- October 20, 2019 at 9:54 pm
  
  MaryMor
  Subscriber
  
  Hello,
  
  I would like to implement adaptive meshing for a buckling analysis which leads to high local distortion.
  
  I have developed my input files in mechanical APDL. I run into element excessive distortion error. I have tried slowing my load steps as well as refining mesh. However, I still have this. I wanted to try adaptive meshing in ANSYS to help me pass the convergence error.
  
  I would like to implement adaptive meshing in mechanical APDL since my input file is already developed there. I have tried the following commands after defining my component:
  
  esel,s,cent,z,45,60
  
  cm,MidElem,elem
  
  ---
  
  cmsel,s,MidElem,element
  
  NLADAPTIVE,all,add,energy,mean,1
  
  However, I get the following error:
  
  "No boundary nodes were detected during the NLAD/rezoning process"
  
  I don't know where the error comes from.
  
  Also, I was wondering is there any difference with the nonlinear adaptive meshing in ANSYS workbench and ANSYS mechanical APDL?
  
  Thanks,
  
  Maryam
- October 22, 2019 at 5:50 pm
  
  Sandeep Medikonda
  Ansys Employee
  
  See the examples listed in the Nonlinear Adaptivity Analysis Guide:
  
  Link 1
  
  I don't know the complete details of your model but try using the name of the component you are defining instead of all in the NLAD command.
  
  There is no difference, Mechanical writes out the ds.dat file which should have the same NLADAPTIVE commands. Now, you are using a energy-based criteria and might want to use mesh/box based criterion.
- October 28, 2019 at 2:25 pm
  
  MaryMor
  Subscriber
  
  Thank you.
  
  I tried your comment by using the name of the component, but that didn't help.
  
  Tried energy and box method, both cases get the same error.