I am trying to simulate a ceiling fan using the sliding mesh technique(geometry in pictures). The fan is of 24-inch dia and enclosure is 10*10*9 feet) I have many meshing techniques. Most of them give an error "mesh could not be generated with given input". meshing was successful using patch conforming tetrahedral but the minimum orthogonal quality is of the order of 10^-9 and maximum aspect ratio of 10^3. I am sure this is the reason for divergence error.
I have tried all the resolution of mesh and different element size, from total elements value of around 900000( min element size - 200 mm) to around 30000000 ( with min element size of 10 mm and 2 refinements at blades of fan in the rotational domain). there is a little change in the numbers of orthogonal quality and aspect ratio.
The geometry is pretty smooth and simple. don't think there should be any problem because of that.
Please Help!
I'm afraid automatic meshing, in most cases, is provoking. And your question in time would be reviewed by many having similar problems. So, if you eventually manage to fix the problem, don't forget others, sharing is caring.
here are some advice you can evaluate:
1. check if the nodes of the mesh are not interlocked, some software can't cope with voidages in mesh.
2. check if the mesh doesn't overlap itself. usually, this happens where a user tries to connect separate meshed parts into a whole.
I hope this helps, also it's a good idea to mention the name of the software you're using, since this can help its developers to fix it or write a guideline for it. and for sure they provide better answers for you.
regards.
Meshing in in Ansys is so important and complicated, Please check the link.
http://www.padtinc.com/blog/wp-content/uploads/2017/04/Advanced-Techniques-in-ANSYS-Meshing_Blog.pdf
I used this file and it was useful.
Don't use automatic meshing. And, try to use the same software for meshing and solving the problem; I think it might be better for compatibility. Try to partition the large domain into several domains, where you can create structured mesh with less accuracy in the far domains and very fine mesh in the main domain (the blade domain).
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