Result of sum QTF analysis for UMaine TLP

Wind & Water
1

Dear Jason,

I am currently looking into the diffraction analysis for TLP floating type structures as a part of my thesis. For validation method, I am recreating the sum QTF plots shown in The Effects of Second-Order Hydrodynamics on a Semisubmersible Floating Offshore Wind Turbine: Preprint (nrel.gov), where the analysis is done for the UMaine TLP.

In this document, it was mentioned that the difference frequency QTF’s are wrong due to some convergence issue, but that there was no issue found with the sum frequency QTF. However, in the diffraction analysis that I have done, using both OrcaWave and Hydrostar, show completely different results (see OrcaWave results in figure below). My question therefore is, if the results shown in the paper are wrong and if there has been a follow up on this topic?

With kind regards,

Kevin Leenders

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2

Dear @Kevin.Leenders,

I’m not quite understanding. You mention the UMaine TLP, but the paper you reference shows the results from the OC4-DeepCwind semisubmersible. The latter QTF has been extensively studied, e.g., as shown in the following paper: https://watermark.silverchair.com/v001t01a022-iowtc2019-7572.pdf?token=AQECAHi208BE49Ooan9kkhW_Ercy7Dm3ZL_9Cf3qfKAc485ysgAABC0wggQpBgkqhkiG9w0BBwagggQaMIIEFgIBADCCBA8GCSqGSIb3DQEHATAeBglghkgBZQMEAS4wEQQM8EoY7ZrWUN2XY1xlAgEQgIID4Ma5PxcUNzGlBAAiFEemwuTeMzWpQnXU-Pog9l7GTDZIK06s1blxfHq5KvOXRDOqXqdZ6gVIqSBxDC1rCYQ37BBFLuJxkZ0JTjxt-Rltag_iBb3Vg56yTWiBaihYycEtqIkstNd3dr5R8Al9EVRpkrH-a3tkwUSClrB2grNJtOjPIop93K3hbAhqWKp2UTRwrn8RBnpc3TmDVfpmyweOt3JEDuCpVVDPoRjw4DyXa_kKRc186hMUKXHCtW-DwfzCHokAql6149dKdfu2LOQ0TGzh6EsqyfBGv_H4LZTrxbO_-pbPrXhXj2AbOllqQFtCpBCnwKwF40u2fufAmh4zJqLjidBcWQzh3gxy34c5VEbg6FtNqY14CXkTNFqA0fcOmri14Qd24-mn9gsAw6NBLy4NwtAttWAEVZc1EDT85DtY_Pvo18EmYH591NA1W7M7XuR09LYZ8MfCPTN4bIH0xcDsvzOV0ulaqX6rDJAeiCks6V96F_sHOYVbzQh1nbpYS6SNJAp4zoqXOsJAu8Y5HnfU4qwW7CfU3uIG_7zzNvqSac5pWK3gddtu-jVE3m5aqf0rBblVwW0VtrAbCpt9og-SagZvFvNLyw25d0dUMCqCbKJxPkoiN3lRDI5Te7NnXDToRPjHtY6wX94dueqt7ksaIvBDh4YbVB9FEGWg7ExeE8LhuC4f3goI8qpB-V9ckKdX6uYGSoaIeIeSjwFFpgGQP2PPVCgnA3Sd8F3ESP7koBn1L7gZZzmKhBOLProW7T80bQvyVXOaGVeiMczm1wqKeFyRpuYv5pep-X6XEk8updTMktHwOQxCP53vXMTbSihaKte_AzL05E3HGSnYMDPUgHuknUpZMmxGjpoA1dkRlz5C2eBP2e0Viu9QVsx3IEz4pGN5tN_PCBdpaCwsZH9880DXb44qROPCw5AkfObsLQfSAOlS9te5mZ0wh_HvgnnRn8ENHiPjt5HOg1ZdXN3UqSlmBI-MOnGLBBgXpgRJHeeAl5iafkU-WVfQliRa2rovaqKk2AneFnDZW0jju5wIssapa2rHbwJO4ljXvSQxNxcMYR4VPTvKlobl-8mCJrizCOlwYKF56telKn_n8q6V9Xs4PvxWzRS8aLg0RpxIPPV6kyhD8FvmTHouqvVWzyBSruumflLAZJ0TAsuvs8DFdROZQV_2kuXjAa7lOs5KC-JZwQmKzYOYjhUZEf_6Kd6DbU9GQWEZkszOhM19lQG-mTbTzjdXEXyuUhPEtOpGRW0sUqb65j24jfD3ZLPLylWUHTCk5lgERJMAX3ECU0pJ9sJ9qxBBQsMxRWY8icD8.

Best regards,

3

Dear Jason,

I made a mistake with pasting the link. The one down here should be the correct one.

The Effect of Second-Order Hydrodynamics on a Floating Offshore Wind Turbine (nrel.gov)

With regards,

4

Dear @Kevin.Leenders,

Thanks for clarifying. The second-order analysis of the UMaine TLP was updated in the following papers:

Comparison of Second-Order Loads on a Tension-Leg Platform for Wind Turbines: Preprint (nrel.gov)
Update on the Comparison of Second-Order Loads on a Tension Leg Platform for Wind Turbines: Preprint (nrel.gov)

Best regards,