Ansys Meshing - Hexahedral Mesh (Pipe)
Written by cfd.ninja
A pipe is the clearest case for a hexahedral mesh. The cross section is constant, so the volume can be swept from the inlet face to the outlet, and the cells line up with the flow direction along the whole length.
The quality of the result is decided on the source face. A mapped face mesh there, often with an O-grid style arrangement that keeps the cells near the wall aligned with it, propagates through the entire sweep. An irregular source face produces an irregular volume, however long the pipe is.
Inflation still matters even in a hex mesh: the cells next to the wall must resolve the boundary layer, with the first layer height set by the y+ your turbulence model expects. The Y+ calculator gives you that value before you mesh.
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