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The C3D15 element is a general purpose wedge element (9 integration points). The shape functions can be found in [1]. The node numbering follows the convention of Figure 57.
Figure 57:
15-node wedge element
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The element behaves very well and is a good general purpose element,
although the C3D20R element yields still better results for the same
number of degrees of freedom. The wedge element is often used as fill
element in ``automatic'' hexahedral meshers. 
guido dhondt
2016-07-31