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general question

 

Hello All,
I have a general question in the DEM. In fact i am trying to make a small DEM program for a course project. I am having trouble with the ball-wall contact in a drop test where everytime the ball just crosses the wall. I have tried to change the stiffness properties to increase the contact force but still no effect. 

Am i missing something here other than evaluating the contact force and applying it to the ball. I know this question may seem primitive but things happen.

Thanks,
-Ahmed

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