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Ansys Learning Forum › Forums › Discuss Simulation › LS Dyna › ICFD Mesh error: Surface Collapse not possible to locate › Reply To: ICFD Mesh error: Surface Collapse not possible to locate

August 15, 2024 at 4:02 pm
Reno Genest
Ansys Employee

Hello Arnaud,

If DT=0 on *ICFD_CONTROL_TIME, then the CFL timestep calculated by the ICFD solver is used:

 

You could try to use a larger DT by specifying the timestep you want to use (DT=5e-6 for example) and see if the results are still good. 

Also, you could try to increase your mesh size a little bit.

Finally, it is recommended to use MPP LS-DYNA to run in parallel on many cores. 

 

Reno.