Convergence issues on simple structure

- March 8, 2022 at 11:33 am
  
  faerone01
  Subscriber
  
  I have a simple unit cell with Master/slave boundaries and floquet excitation as seen in pic related. top and back layer are PEC, substrate is rt duroid with an epsilon of 2.2 and loss tangent of 0.001
  I have tremendous issues having it converge on a 0.001 deltaS criterion, taking up to 40 passes per simulation. Is it normal that such a simple structure may have trouble converging ?
  pic related.PNG
- March 9, 2022 at 12:33 pm
  
  Anchal Singh
  Ansys Employee
  
  Could you please tell us why are you using such a tight convergence criterion (delta S 0.001)? Is there any specific reason not to use the default one (delta S 0.02)?
  Please use the 'Image' option to upload screenshots.
  
  Thanks
  Anchal

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