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[ANSYS Meshing] Meshing symmetry issues, heels and gaps

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Old   January 27, 2017, 10:26
Default Meshing symmetry issues, heels and gaps
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Andy
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Hey Guys,

I am modelling a ship hull (canoe) with a length of 4,5m. I am using the symmetrie option. For the mesh generartion I have sliced the domain in a couple of seperate bodies. Ive used mainly edge sizing and multi zone to generate a more or less fine mesh at the important areas. Around the ship hull I have created an inflation layer with a first layer thicknes off 0,0005m, growth rate of 1,1 and 10 layers. The cube around the hull are tetraedons with a smallers element sizie to get a clear waved pattern around the ship hull. Also important for me is to visualize the wavepatern and therefore I have used edge sizing with a bias function and high bias factor to generate small brick elements at the water surface boundary.

As you can see in the picture I have issues at the sliced zones. There are elements missing and those gaps and heels, which cause the solver to stop cause its not a symmetrie plane anymore.

Currently I have 1.6 Mio nodes.


I am happy about every mesh optimazion inputs. Is the approach I have used ok?

The rigid body has three degrees of freedom in X,Y and Z Rot.

Kind Regards and thanks in advance!




overview.jpg

canoe_symmetry_modell.jpg

inflation_layer_front_canoe.PNG

mesh_issue_at_sliced_areas.PNG
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Old   February 16, 2017, 06:36
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Andy
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Hey Guys,

I am still struggeling with that symmetrie issues. I have used another meshing aproach in which I havent those gaps and heels anymore. But still getting the symmetry issue alert in the solver:


Quote:
Message: |
| The symmetry boundary condition requires that the boundary patch |
| mesh faces form a plane or axis. However, face set 3 in the |
| symmetry boundary patch |
| |
| Symmetry |
| |
| is not in a strict plane, which means that at least one of its |
| faces is not parallel to the others. To make the solver run |
| you can do one of the following: |
Ive also tried setting the expert parameters

'vector parralel tolerance' to 10 degrees
'degeneracy check tolerance' to 1e-2

Any ideas?

Best,


Andy

new_approach.jpg
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