3D beam modal analysis using tetrahedral element and different mesh sizes.
    Input model provided by: Jon Ander Sarasua.


   3D beam with 100 nodes:
   3D beam with 582 nodes:
   3D beam with 847 nodes:
   3D beam with 1063 nodes:

  Dimensions:          length = 1.0 m, width = 0.1 m, height = 0.1 m.
  Material properties: E = 2e11 Pa, ρ = 7890 kg/m3, ν = 0.3.

  

  Theoretical frequency for the first mode: 81 Hz
  

  1st mode shapes:
		

     100 nodes, 208 elements:                              582 nodes, 1984 elements:
  

     847 nodes, 3265 elements:                             1063 nodes, 4269 elements: