Wave Excitation Tests on a Fixed Sphere: Comparison of Physical Wave Basin Setups

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review


Wave excitation tests on a fixed sphere with the center at the still water level were carried out with three different physical wave basin setups. The tests were completed as a continued effort of the working group OES Wave Energy Converters Modelling Verification and Validation to increase confidence in numerical models of wave energy converters by generation of accurate benchmarks datasets for numerical model validation. An idealized testcase with wave excitation of a fixed sphere to be used with the benchmarks was formulated. The three investigated physical wave basin setups included: 1) a six degree-of-freedom load cell mounted to the top of the sphere, 2) a bending beam force transducer mounted to the top of the sphere, and 3) a system of six pretensioned wires mounted to the top and bottom of the sphere with force transducers attached to each wire. The aim of the present paper is to identify the best representation of the idealized testcase. To this end, the three experimental setups are inter-compared in terms of dynamic properties, sensitivity, and disturbances of the water phase from the presence of measurement equipment. Low inter-experiment variability was disclosed, i.e., 5-8% depending on wave-nonlinearity, indicating accurate representations of the idealized testcase across all setups. Setup 3 was found to be the more accurate representation and further work with this setup to release a public benchmark dataset was planned.
Original languageEnglish
Title of host publicationProceedings of the 15th European Wave and Tidal Energy Conference
PublisherEuropean Wave and Tidal Energy Conference
Publication dateSept 2023
Article number170
Publication statusPublished - Sept 2023
EventEuropean Wave and Tidal Energy Conference - Bilbao, Spain
Duration: 3 Sept 20237 Sept 2023
Conference number: 15


ConferenceEuropean Wave and Tidal Energy Conference
Internet address
SeriesProceedings of the European Wave and Tidal Energy Conference


  • physical tests
  • sphere
  • wave energy converters
  • fluid–structure interaction
  • wave excitation force


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