Linkage issue – Discovery live

- January 21, 2020 at 1:47 pm
  
  cbolle
  Subscriber
  
  Hello, I am facing an issue during the static and modal simulation of the assembly above. The two parts are normally separated by a gap of 0,5 cm at the minimum... However, it seems that an unwanted linkage is being created between the parts. No assembly mates were assigned at this location and the parts were only attached with 4 screws at the top of the semi-spherical part. The simulation was performed at the highest level of fidelity. What can I do to avoid this kind of issue ? Thanks in advance.
- January 22, 2020 at 5:59 am
  
  Subashni Ravichandran
  Ansys Employee
  
  Hello cbolle
  
  If you hold your mouse over the fidelity bar, you will be able to see the minimum size captured by the mesh. (in the 2019 R3 and 2020 R1 versions only)
  
  If the gap is smaller than the minimum mesh size there is a good chance that it is not being captured appropriately,
  
  If you are using the older version of Discovery Live, I would recommend you to upgrade to 2020 R1 version as it has better mesh capabilities.
  - January 22, 2020 at 10:43 am
    
    cbolle
    Subscriber
    
    Subashni Hello,
    
    Yes, it seems that the gap is too small for the meshing... I used the last version released. This make a big difference in modal results... Thank you for your help.
  - January 22, 2020 at 2:57 pm
    
    ERab
    Ansys Employee
    
    Hi cbolle , What GPU are you using?
    
    Also, In some situations like this, it is reasonable to ever so slightly change the geometry to increase the gap so they don't merge, and you can still get a reasonable answer.
  - January 22, 2020 at 3:19 pm
    
    cbolle
    Subscriber
    
    Hi Ethan , I am using a NVidia quadro RTX 5000. I will try it that way.
  - January 22, 2020 at 3:29 pm
    
    cbolle
    Subscriber
    
    Hi Ethan , when I apply a modal and structural simulation to the same model with the exact same configuration I can observe a difference in the precision of the mesh at the lowest level a fidelity.
    
    In static: 3,82mm
    
    in modal: 5,89mm
    
    Why are they different values ?

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