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In the second video, we generate a "Hex Dominant" mesh which gives us predominantly hexahedral elements. The number of nodes is below the  ANSYS student product limit.

In the third video, we consider the number of algebraic equationsThe resulting mesh has 26,934 nodes. There are 3 degrees of freedom per node (displacements in x, y and z directions). So ANSYS will generate 26,934*3 ~ 80k algebraic equations to solve our four coupled boundary values problems. 
 

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