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[solids4Foam] Fixed-Rotation boundary doesn't affect whole mesh

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Old   October 11, 2021, 13:20
Default Fixed-Rotation boundary doesn't affect whole mesh
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Patrick Höhn
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Hi everyone,



In the attached case a fixed rotation boundary is added on the patch at the left end in the figure. All other patches are set to zeroGradient. As shown in the picture below, only a small part of the mesh is actually moving. However, I would rather expect that the whole pipe is uniformly rotating. A uniform could be only achieved if the mantle areas of the pipe are defined with fixed Rotation. However, this would be possible in the final model.

I attached the underlying case to this issue.


I am grateful for any suggestions.
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File Type: zip pipe1.zip (10.5 KB, 6 views)
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Old   October 13, 2021, 06:50
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Philip Cardiff
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Hi Patrick,

I suggest changing the following:
  • Change the inner-wall and outer-wall boundary conditions from zeroGradient to solidTraction with zero traction
  • Change the inlet boundary condition from zeroGradient to fixedDisplacement
  • Change the zeroGradient boundary conditions to solidTraction with zero traction
  • Increase the number of outer correctors in constant//solidProperties
  • [Optional] Loosen the solution tolerances in constant/solidProperties

I tried this and the results seem reasonable.

Philip
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Old   April 13, 2022, 11:50
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Vi Kumar
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Hey! Could you share your case file now, if it's working? I've been trying to simulate a rotating pipe with vibrations but I'm not having too much luck.
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