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Problem with fast growing cells in LS-Dyna

- April 8, 2026 at 8:00 pm
  
  htwFrank
  Subscriber
  
  Hello,
  I have created a bumper and a guard-rail. (I have used similar KEYWORDS like in the Yaris test case.)
  In the time step, where the bumper hits the rail. Big, fast growing cells are produced at the bumper (see red circle).
  Is it weak convergence? What can I do?
  My best wishes & Thank you!
  Frank
- April 9, 2026 at 7:26 am
  
  Nanda
  Ansys Employee
  
  It seems like an impact test, so probably explicit. There’s no convergence in Explicit. Does the simulation end with normal termination? Most probably this should end up with negative volume error termination.
  Could you confirm?
  Regards,
  Nanda.
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