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Ansys Learning Forum › Forums › Discuss Simulation › LS Dyna › Peridynamics horizon in Impact Analysis › Reply To: Peridynamics horizon in Impact Analysis

May 3, 2024 at 6:24 am
Reno Genest
Ansys Employee

Hello Pau,

Why are you using DR=2 while the LS-DYNA User Manual Vol I recommends DR = 0.6 - 1.2 ?

 

The LS-DYNA solver will try to adjust DR so that the number of neighbors at a point is between 10 and 136. Search for Warning messages in the messag file similar to:

"Warning. The maximum neighbor number is 36

     the minimum neighbor number: 9

     which violates the threshold: 10~136 (Min~Max).

     The horizon size will be tuned, and new search starts"

 

 

I would pick a value of DR so that the number of neighbors at a point is between 10 and 136.

 

Let me know if this helps.

 

 

Reno.