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any optimal scheme for 3D simulation (vortex-induced vibration)?

- March 1, 2023 at 3:03 pm
  
  Milne Ando
  Subscriber
  
  G'day,
  I've tried several different settings to find a optimal scheme for 3D VIV simulations. Basicly, I'll keep using PISO since it's highly recommended for transient flow. (and with Green-Gauss Node Based gradient). But what about pressure interpolation(PRESTO!, body force weighted) and under-relaxation factors for pressure and momentum? I tried both pressure interpolation schemes, but didn't benefit from them as the pic shows:
  "equations converged but mesh motion hasn't reached convergence criterion (1e-05)."
  Does anyone know how to make this kind of simulation stable? Please share with me. Thank you!
  Note that my mesh was built well with minimum orthogonal quality of 0.3.
- April 12, 2023 at 8:29 pm
  
  Federico
  Ansys Employee
  
  Check if reducing the time step helps with convergence of the mesh motion.

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