We have an exciting announcement about badges coming in May 2025. Until then, we will temporarily stop issuing new badges for course completions and certifications. However, all completions will be recorded and fulfilled after May 2025.

Ansys Learning Forum › Forums › Discuss Simulation › General Mechanical › Non-linear calculation that fails, Deformation of a fence following an impact › Reply To: Non-linear calculation that fails, Deformation of a fence following an impact

March 26, 2024 at 2:11 pm
Armin
Ansys Employee

Hi Raphael,

Try bringing the car (impactor) into close proximity of the fence so the two objects are "just touching" before the impact. This saves some simulation time and doesn't affect the accuracy of simulation since you have already defined a proper initial velocity at impact. 

Try using a smaller "End Time" under Analysis Settings, something like 0.002 seconds and increase this value after checking the initial run if necessary.

If your mesh is too small, it will increase the simulation time. Remember that the time step size is dictated by the smallest element of the model in explicit dynamics analysis.

After trying the suggestions above, if your run time was still not reasonable, look up online for a technique called "mass scaling". The theoretical aspect of this technique is covered in Lesson 2 of the course I shared with you earlier: Time Step in Explicit Dynamics - Lesson 2 (youtube.com)