[zjvskobe]

Dear all,
I'm now trying to generate tet prism grid using icem. To improve the grid quality at the leading edge, I want to use elongated triangles like the mesh of image.png (DPW 2). But i don't know the detailed skills. Could anybody tell me the detailed steps?
Thanks a lot!

[siw]

If you have the surface for e.g. the leading edge so that it has four edges (root, tip, pressure side, suction side) you can set the node quantities and distibutions (equal quantity on opposing edges) using curve mesh set-up and then run the quad surface mesh with the Autoblock method to make quad cells. Then you can edit the mesh to convert all the quad cells to tri cells. It's been a long time since I last did this so you'll need to run a quick demo on say a cube face to check for yourself. With this way you can make anisotropic cells to better capture the leading edge curvature without the expense of lots of cells in the spanwise direction (apart from at the root and tip).

[zjvskobe]

Thanks a lot. But i am still a little confused. The usual steps I use icem to create tetra/prism mesh is fixing geometry, creating material point, setting surface and curve distribute parameters and computing mesh. So all the mesh generating process is automatic. The method you mentioned need edit the LE surface individually, but how to generate the volume and prism mesh?

[siw]

How you use what I said all depends on your overall approach to generating your entire mesh.

1. Let's assume you set your mesh sizings, as you said, and run the octree method to get a volume mesh. Most know that using a Delaunay method is better in some aspects than an octree method for the volume elements (e.g. fewer elements, smoother element volume transition etc). So you could delete all the volume octree elements and the surface elements on the leading edge. That would leave you the unstructured surface mesh. You can then regenergate the leading surface mesh with the Autoblock method and then a new Delaunay volume mesh.

2. Alternatively, you may, again after setting your sizings, generate the surface mesh prior to making the volume mesh. In this instance you can put the leading edge surface into its own PART and generate the surface mesh by PARTS since you'd be using different surface mesh methods. After that make you volume mesh (not octree).

In both cases you may need to use the Mesh Curve to ensure conforming nodes between the Autoblock surface and the unstructured surface meshes. You'll need to check this as I may be wrong as it has been quite a while since I needed to use Autoblock.

Furthermore, once your volume mesh is built you can then generate your prism layers. I (and possibly most others) make prism layers after making the volume (tetra etc) elements.

[zjvskobe]

Oh, gotcha! Thanks a lot again, i'll have a try!