Figure 1

Meshing of a triangular prism element. (a) shows that two-layer triangular prism meshes can be directly spliced. The triangle at the top of the triangular prism can be generated with the topography. According to the top triangle, we extend the shape downward to create a triangular prism element. (b) represents the coupling of tetrahedral elements and triangular prism elements. The red surface is the coupling surface³⁵.