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  3. Why is the FLUID136 method for obtaining squeeze-film damping giving a small negative beta value and issuing a warning?

Why is the FLUID136 method for obtaining squeeze-film damping giving a small negative beta value and issuing a warning?

Tagged: 10, low-frequency, Mechanical APDL (f. ANSYS), Multiphysics and EMAG (APDL), structural-mechanics
    • March 17, 2023 at 8:59 am
      FAQFAQ
      Participant

      Squeeze-film damping is almost purely viscous and alpha damping dominates. The warning message can probably be ignored. A negative value for beta damping is quite common and will be accepted by ANSYS. There could be a problem at higher frequencies if the negative value is used, so you may just want to use the alpha damping value.

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