Almost all the solid element meshes I come across in the last decade or so have used second order 10 noded tetrahedral elements, and for most applications, they are perfectly fine.
There are however some applications in some FEA solvers that require a hex8 element – for example some elastomer models, magneto and electrostatic solvers and some acoustic solutions. How do you mesh an irregular part in hex elements?
Traditionally you use a combination of extruding and revolving a 2D planar mesh on various surfaces or cross-sections. Re-meshing such a scheme means effectively starting from scratch.
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