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the DEM's solutions for static mechanics seem strange

My own DEM(Discrete Element Method) program's solution for static problem seems strange.

I use my program to calculate the displacement of a cantilever under static pressure:

1. it seems my program shows convergence for static problem as the mesh gets denser. As the mesh grows denser(that means the particle becomes smaller), the displacement(of y direction)  of the free tip becomes smaller.

2. if the particle is big, the displacement of the free tip is greater than the theoretical solution, but if the particle is small enough,  the displacement gradully becomes smaller than the theoretical solution.

3. the difference between computation solution and the therotical solution is about 4%(when the particle is small enough) 

 

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