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The C3D15 element is a general purpose wedge element (9 integration points). The shape functions can be found in . The node numbering follows the convention of Figure 61.
15-node wedge element
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.
The F3D15 element is the corresponding fluid element.