Learning Forum

[Yerucham100]

I am having issues meshing this blade in Ansys, it takes a very long time and always ends in errors. I tried reducing the element size but this hasn't worked.
I attached the IGES file in a zipped file below

[jj77]

Well, there is a very very narrow and long face (highlighted with a blue line below) that is causing for sure problems.

 

 

There could be some more things, but this is a start. In the software fixing this allows for a good mesh Since this face is ver thin/narrow (~0.8 mm)

[Yerucham100]

I thought that was an issue too and because of that I reduced the element size to less than the thickness of that face but the main blade surface is still failing to mesh, which makes me wonder what the issue is. What mesher did you use?

[jj77]

That face will need to have very narrow and small elements to mesh effectively.

 

The above is from Strand7, the FEA software that I have - when I removed that face and zipped the free edges together to close the volume again, it meshes fine.

 

Definitely though the large curved surface is not great, and can be tricky to mesh. If you could split or make it composed of several smaller faces and make them smoother, that would be good. Also I assume this is a surface mesh or is it a solid (if solid or surface where are all the internals gone, ribs, spars,..)

 

If you want archive (file/archive your model), and attach it here, then we can have a closer look.

 

 

[Yerucham100]

This is the zip of the wbpj file

[peteroznewman]

The .wbpj file on its own is useless. Delete the attached zip file and use File > Archive to create a .wbpz file which can be attached directly to your post without using zip.

[Yerucham100]

Here is the .wbpz file

[jj77]

An important thing to remember once finished studying and start using perhaps FEA as part of your work, perhaps as an engineer.

 

The cad file received from a CAD team or (from other CAD experts), are very often way to detailed for FEA, so it is important to understand that. Of course the best thing is to do it your self, and then you know what level to have (in large companies this is not possible when they have teams of hundreds of cad engineers and cad assemblies of millions)

Thus one needs often to remove a lot of detail, and also to repair some features that might look OK, but are not for FEA *e.g., as I said the large skin surface).

Also from my experience helping and teaching aerospace and naval engineers FEA, is that their structure have a skin (just like the turbine blade on a wind turbine), and inside they have internals structures. The wing skin, or hull in a ship is 3D modelled with surfaces and thus meshed with shell elements. So are the internals. (This is valid for global models - of course one can study a certain internal part in more detail using 3D models).

Now if you just want to mesh this for the sake of meshing just use the settings below.

That is it from me.

 

[Yerucham100]

Thank you!