TAGGED: aqwa, hydrodynamic-diffraction, mesh, meshing, solving-sequence
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August 28, 2023 at 6:34 amAniket ParidaSubscriber
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August 29, 2023 at 8:04 amMike PettitAnsys Employee
Hello,
Please can you click on the Mesh object in the Outline tree, and share a screenshot of the mesh that has been generated for the structure?
The illegal connectivity error may also be due to a 'T' junction in the geometry. Do you have any internal surfaces in the vessel?
Mike
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August 29, 2023 at 9:25 amAniket ParidaSubscriber
Yes IÂ have an internal surface
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August 29, 2023 at 9:26 amAniket ParidaSubscriber
Actually it is a hollow cylinder having 3mm thickness
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August 29, 2023 at 11:21 amMike PettitAnsys Employee
Thanks. From your originial image, it appears that the cylinder has a top surface as well. Is this also 3 mm thick? Is the top surface connected to both of the inner and outer cylinder surfaces? There should be a continuous, undivided space inside the vessel, i.e. no internal walls between the surfaces.
I should also mention that for a hollow cylinder of 3 mm thickness, you will need to use quite a small mesh element size. Strictly, the element size should be no larger than the separation between the surfaces (3 mm). However, you can relax this requirement by turning on the Hydrodynamic Diffraction Analysis Settings option 'Ignore Modelling Rule Violations', which would allow you to increase the mesh element size a bit.
Mike
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August 29, 2023 at 2:56 pmAniket ParidaSubscriber
you have mentoned about T joint here
So if I join 2 cylinders perpendicular to each other will it show any error somewhere?
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August 29, 2023 at 3:12 pmMike PettitAnsys Employee
Yes, if you join two cylinders perpendicular to each other and you do not remove any overlapping internal faces, then you will get an error.
The error for a 'T' junction in the surfaces will only show as you try to Solve the analysis, when you will see the 'ILLEGAL CONNECTIVITY' error from the solver.
However, you may also see this error message if there is a problem in the mesh, where two mesh nodes are very close together. This may occur when you import an inexact geometry file, like an IGES file.
One other point to note: if the separation between the surfaces is 3 mm, then you should ensure that the Connection Tolerance in the Mesh settings is less than 3 mm, otherwise the mesher will automatically connect the inner and outer surfaces together. This could also cause the 'ILLEGAL CONNECTIVITY' error.
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August 31, 2023 at 7:10 amAniket ParidaSubscriberif i
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- The topic ‘Illegal connectivity error in Aqwa’ is closed to new replies.
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