3.12 Module 3 | Meshing in OpenFOAM | snappyHexMesh |

[@jeromepowelltoecrum6044]

If we have an airfoil with a sharp trailing edge is it better to let the trailing edge boundary layer collapse or allow it to be super skewed in that region and use skew correction or other accomodating numerical schemes? Which numerical schemes are most important to change when you have this sort of issue?

[@wolfdynamics5703]

Hi, we are preparing a video on the subject. Hopefully it will ready later this month. In any case, my advice is to avoid collapsing cells in the trailing edge.

[@jeromepowelltoecrum6044]

@@wolfdynamics5703 Thank you. Yes it seems that collapsing actually led to worse results especially. I think the most tricky part in 3d wing simulation is to get the wing to smooth as possible without a very large amount of cells

[@jeromepowelltoecrum6044]

I am trying to mesh the oneraM6 with snappy and only getting like 97-98% coverage with 3-4.5 million cells which (not sure) feel inadequate given the mesh looks fairly dense in the right areas in comparison to some of your tutorials where you get 99+ % coverage. Im failry lost now and I am wondering if it's a good idea to lower /remove the mesh requirements for the boundary layer part. Thx

[@jeromepowelltoecrum6044]

Also in the previous videos and this one you advise against going higher than 4 4 for refinement surfaces (in this one you say in the limit what you recommend to use) I am wondering in what cases is it better to go higher if at all?

[@wolfdynamics5703]

Hi, we are preparing a training where we go into details about meshing with snappy. In any-case, that is a personal preference. Refinement of more that 4 4 use a lot of memory and tend to add too many unnecessary cells.