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### Fifteen-node wedge element (C3D15 and F3D15)

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 51.

Figure 51: 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.