[Simon_A]

Good Evening,

using SnappyHexMesh for a 2D airfoil case, I encounter the following problem:

short description:
Snappy meshes in 3rd dimension and consumes high computational power, but after extrudeMesh, the mesh quality is low.


In blockMesh, the patches "left" and "right" are set "empty", which should tell snappy to not mesh in the 3rd dimension - however, this is happening along the stl surface.

The workaround to then generate a 2D mesh as described in the various threads here is to extrude one of the empty patches using extrudeMesh.

In theory, this works.

In practice, I have to generate a 20 million cells mesh with snappy to get 100000 cells after having used extrudeMesh.

Is something wrong in this workflow, or is there actually some kind of bug in snappy that causes computational inefficiency ?

platform:
Ubuntu 12.10, OF 2.2.0 (also encountered the same problem on a OF 1.6 machine)

Thank you very much for any help regarding this problem.

case file:
https://dl.dropboxusercontent.com/u/...nlineDB.tar.gz