High VNB velocity - FF wind array boundary

yang7857854 / F2A

F2A is an aero-hydro-servo-elastic tool developed based on AQWA by Yang Yang, a postdoctoral research associate in Liverpool John Moores University for performing fully coupled analysis of floating offshore wind turbines (FOWT). The aero-servo-elastic simulation capabilities are fully implemented within the user_force64.dll which is a built-in DLL of AQWA for external force calculation. For a coupled analysis of a floating offshore wind turbine subjected to wind, wave and current loadings, the aerodynamic loads acting on the rotor, the elastic responses of the blades and tower, and the servo-control are examined through the DLL, considering the influence from the platform motions. The platform position, velocity and acceleration at each degree of freedom are passed into the DLL to update the kinematics of the upper structures. Before being passed into DLL, these terms are transformed from the inertial coordinate system to the local coordinate system of the platform.

GNU General Public License v3.0

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Hi Naghmeh,

I have no idea why you encounter such an issue if you are running the case that I provided on github. The yaw DOF must be deactivated in AQWA if you are using the AQWA with a version not later than 2023R1. The connection stiffness cannot be transfer into the time domain analysis in earlier AQWA. However, this capability is implemented within 2023R1 and later AQWA program. The initial design of the mooring system of the spar model is a delta-type. The torsional stiffness must be corrected using an additional stiffness. Maybe you can check for that.

	Yang Yang Ningbo University - Associate Professor +86-0574-87604348 @.*** 169 South Qixing Road, Ningbo Postcode: 315832 Web: hyxy.nbu.edu.cn/info/1178/10531.htm

---- Replied Message ---- | From | @.> | | Date | 6/20/2024 17:39 | | To | @.> | | Cc | @.***> | | Subject | [yang7857854/F2A] High VNB velocity - FF wind array boundary (Issue #7) |

Dear Dr Yang Yang I use F2A to model OC3_hywind and I have this error. The total time simulation is 2000 sec and TD is 0.005. Wave significant amplitude and period is 3.17 m and 10.99 s. Wind speed is 10.5 m/s. May I ask you to give me an advice to fix this issue? Naghmeh

f2a.JPG (view on web)

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yang7857854 / F2A

High VNB velocity - FF wind array boundary #7