Preliminary experimental study on the influence of the local wind field on forces from breaking waves on a circular cylinder

Julie Caroee Kristoffersen, Henrik Bredmose, Christos Thomas Georgakis, Longbin Tao

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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Abstract

The spatial localized influence of wind on wave induced load on a flexible cylinder has been assessed throughout a test series conducted in a wave-wind-current flume at Newcastle University. The tests are motivated from other experimental and numerical investigations showing air flow separation on the leeward side of steep waves that can lead to added wind energy transfer, which could suggest an increase in the impulsive wave loading. The waves are generated as focused waves, resulting in a plunging breaker, leading to an impulsive wave load. The test model was equipped with a load cell measuring the connection load. Due to the flexibility of the cylinder, the measured force response shows oscillations and dynamic amplification of the load. The maxima of the force responses are compared for the tests with and without wind. Another measure for comparison is the local and short-lived impulse, which is responsible for the amplification. This impulsive load is estimated from the load cell and acceleration measurements. For the tests in this study, the introduction of wind over the breaking waves does for some cases lead to a slight increase in the peak of the impulsive load and thereby the load response, although large scattering is present. Further investigations are needed to verify this effect. Some differences in the time series of the free surface elevation are observed when wind is present, but the maximum of the surface elevation does not change notably, and the slope is only minimally changed, meaning that this should not give basis for the differences in the loads.

Original languageEnglish
Title of host publicationASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering
Subtitle of host publicationVolume 7B: Ocean Engineering
Place of PublicationNew York
Number of pages9
DOIs
Publication statusPublished - 11 Nov 2019
Event38th International Conference on Ocean, Offshore & Arctic Engineering - Scottish Event Campus, Glasgow, United Kingdom
Duration: 9 Jun 201914 Jun 2019
Conference number: 2019
https://event.asme.org/OMAE

Conference

Conference38th International Conference on Ocean, Offshore & Arctic Engineering
Abbreviated titleOMAE
Country/TerritoryUnited Kingdom
CityGlasgow
Period9/06/1914/06/19
Internet address

Keywords

  • airflow separation
  • breaking wave
  • focused wave
  • offshore structure
  • wave-induced load
  • wind influence

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