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Ansys AQWA

- July 31, 2024 at 2:56 pm
  
  karim.raed
  Subscriber
  
  Hi,
  Can I find the natural modes of a moored floating structure in any output file, or is the only way to exract it from from the workbench?
  Many thanks,
  Karim
- August 1, 2024 at 9:20 am
  
  Mike Pettit
  Ansys Employee
  
  Hi Karim,
  Quick answer - no, the only way is to extract from Workbench.
  More specifically, we do output the undamped natural modes of the freely-floating structure in still water, and you can find these at the bottom of the Hydrodynamic Diffraction LIS file (e.g. project_files\dp0\AQW\AQW\AQ\Analysis\ANALYSIS.LIS). These do not account for the mooring system, though.
  The Natural Modes results you find in a Hydrodynamic Diffraction or Hydrodynamic Response Stability Analysis are running their own post-processing calculations to determine the natural modes of the system. Because the added mass and radiation damping are frequency-dependent, we need to scan through a whole range of frequencies to find the natural modes - this is what the 'mode match indicator' graph is showing. This scanning capability only exists in Aqwa Workbench.
  I hope this helps!
  Mike
- August 1, 2024 at 9:25 am
  
  karim.raed
  Subscriber
  
  Hi Mike,
  Many thanks for the clarification!
  Karim

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