Meshing near leading and trailing edge of propeller

surajp92 · May 31, 2017, 17:49

I am modeling KA 470 propeller in open water condition. And, I am not able to get prism layer meshing near leading and trailing edges. My leading and trailing edges have wedge shape.

I tried changing the minimum thickness percentage and layer reduction percentage. But I still have not got good meshing at edges. So, I am trying to create either C-Type or O-Type mesh. But for that I need to create interface before creating C-Type or O-type mesh. And for that I will have to add surface to split edges. So I am not able to figure out how can I add the surface to split leading and trailing edge. My leading and trailing edges are singular edges, so how shall I create the surface to split these edges?

me3840 · June 1, 2017, 01:40

In general these types of meshes are difficult to generate with any mesh generator. The solutions are pretty standard across meshers.

1. Don't have a trailing edge like this. Truncate it at some point or fillet it.
2. Increase your mesh resolution near the tip so the prisms don't have such high aspect ratios. This often gives you what you're looking for, but the skewness isn't great.
3. Add a zero-thickness interface at the trailing edge going outward and let the prisms grow on to it. This is nicer than 2, but you will still be left with faces of your prisms collapsing when they meet the core - but it doesn't happen right at the TE, so you care less about it. I think this is the solution you're asking about.

Depending on the propeller geometry you may not be able to make that surface geometry in STAR-CCM+. You can try offsetting the edge in surface repair, which may work, but picking the direction can be hard. If you can manage to make an offset in a radial coordinate system that would be optimal. You can also try making a copy of your geometry, scaling it, and then building a surface between your original trailing edge and the scaled one, then deleting the scaled geometry. Otherwise you will have to generate it in a CAD package.

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June 1, 2017, 01:40		#2
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	In general these types of meshes are difficult to generate with any mesh generator. The solutions are pretty standard across meshers. 1. Don't have a trailing edge like this. Truncate it at some point or fillet it. 2. Increase your mesh resolution near the tip so the prisms don't have such high aspect ratios. This often gives you what you're looking for, but the skewness isn't great. 3. Add a zero-thickness interface at the trailing edge going outward and let the prisms grow on to it. This is nicer than 2, but you will still be left with faces of your prisms collapsing when they meet the core - but it doesn't happen right at the TE, so you care less about it. I think this is the solution you're asking about. Depending on the propeller geometry you may not be able to make that surface geometry in STAR-CCM+. You can try offsetting the edge in surface repair, which may work, but picking the direction can be hard. If you can manage to make an offset in a radial coordinate system that would be optimal. You can also try making a copy of your geometry, scaling it, and then building a surface between your original trailing edge and the scaled one, then deleting the scaled geometry. Otherwise you will have to generate it in a CAD package.