problems with fast rotating overset mesh

- November 28, 2019 at 9:28 pm
  
  AgriCFD
  Subscriber
  
  Currently I try to simulate a mower with to fast rotating (3000rpm) knifes. There is an overlap of the rotational movement of the knifes, so have to work with an overset mesh.
  
  If I simulate a slower rotational Speed (<300), the calculation works fine. But when I try to calculate the high speed rotation I get a Floating point exeption, because of divergence in the turbulence variables, after 1-10 timesteps, depending on the used mesh and time step size. I've tried a wide range of cell sizes and time step sizes (1e-3 to 1e-06), but nothing works. Further I tried the most of the turbulence models that are working with overset meshes, but the result is always the same.
  
  The attached screenshot Shows a cutcell background mesh, I also tried tetra- and polyhedral meshes. I even tried very Basic geometries like Rotation boxes and even in that case the calculations Interrupt.
  
  Are there any limitations on overset meshes that I'm not aware of?
- November 28, 2019 at 9:29 pm
  
  AgriCFD
  Subscriber
  
  sadly attaching of the screenshot is not possible in the moment

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