Effect of Air Fraction on Force Coefficients in Oscillatory Flow
The forces on marine and offshore structures are often affected by spilling breakers. The spilling breaker is characterized by a roller of mixed air and water with a forward speed approximately equal to the wave celerity. This high speed in the top of the wave has the potential to induce high wave l...
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American Society of Mechanical Engineers
2021
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Online Access: | https://orbit.dtu.dk/en/publications/3e6cb1b0-7c6d-4a5c-ba17-baf69a7c0758 https://doi.org/10.1115/OMAE2021-61122 |
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ftdtupubl:oai:pure.atira.dk:publications/3e6cb1b0-7c6d-4a5c-ba17-baf69a7c0758 2023-05-15T14:23:03+02:00 Effect of Air Fraction on Force Coefficients in Oscillatory Flow Vested, Malene Hovgaard Christensen, Erik Damgaard 2021 https://orbit.dtu.dk/en/publications/3e6cb1b0-7c6d-4a5c-ba17-baf69a7c0758 https://doi.org/10.1115/OMAE2021-61122 eng eng American Society of Mechanical Engineers info:eu-repo/semantics/closedAccess Vested , M H & Christensen , E D 2021 , Effect of Air Fraction on Force Coefficients in Oscillatory Flow . in Proceedings of the ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering . vol. 6: Ocean Engineering , V006T06A003 , American Society of Mechanical Engineers , 40th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2021) , 21/06/2021 . https://doi.org/10.1115/OMAE2021-61122 Wave loads Air-entrainment Force coefficients /dk/atira/pure/sustainabledevelopmentgoals/life_below_water SDG 14 - Life Below Water contributionToPeriodical 2021 ftdtupubl https://doi.org/10.1115/OMAE2021-61122 2023-01-12T00:15:32Z The forces on marine and offshore structures are often affected by spilling breakers. The spilling breaker is characterized by a roller of mixed air and water with a forward speed approximately equal to the wave celerity. This high speed in the top of the wave has the potential to induce high wave loads on upper parts of the structures. This study analyzed the effect of the air content on the forces. The analyses used the Morison equation to examine the effect of the percentage of air on the forces. An experimental set-up was developed to include the injection of air into an otherwise calm water body. The air-injection did introduce a high level a turbulence. It was possible to assess the amount of air content in the water for different amounts of air-injection. In the mixture of air and water the force on an oscillating square cylinder was measured for different levels of air-content, - also in the case without air. The measurements indicated that force coefficients for clear water could be use in the Morison equation as long as the density for water was replaced by the density for the mixture of air and water. Other Non-Article Part of Journal/Newspaper Arctic Technical University of Denmark: DTU Orbit Breaker ENVELOPE(-67.257,-67.257,-67.874,-67.874) Volume 6: Ocean Engineering |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Wave loads Air-entrainment Force coefficients /dk/atira/pure/sustainabledevelopmentgoals/life_below_water SDG 14 - Life Below Water |
spellingShingle |
Wave loads Air-entrainment Force coefficients /dk/atira/pure/sustainabledevelopmentgoals/life_below_water SDG 14 - Life Below Water Vested, Malene Hovgaard Christensen, Erik Damgaard Effect of Air Fraction on Force Coefficients in Oscillatory Flow |
topic_facet |
Wave loads Air-entrainment Force coefficients /dk/atira/pure/sustainabledevelopmentgoals/life_below_water SDG 14 - Life Below Water |
description |
The forces on marine and offshore structures are often affected by spilling breakers. The spilling breaker is characterized by a roller of mixed air and water with a forward speed approximately equal to the wave celerity. This high speed in the top of the wave has the potential to induce high wave loads on upper parts of the structures. This study analyzed the effect of the air content on the forces. The analyses used the Morison equation to examine the effect of the percentage of air on the forces. An experimental set-up was developed to include the injection of air into an otherwise calm water body. The air-injection did introduce a high level a turbulence. It was possible to assess the amount of air content in the water for different amounts of air-injection. In the mixture of air and water the force on an oscillating square cylinder was measured for different levels of air-content, - also in the case without air. The measurements indicated that force coefficients for clear water could be use in the Morison equation as long as the density for water was replaced by the density for the mixture of air and water. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Vested, Malene Hovgaard Christensen, Erik Damgaard |
author_facet |
Vested, Malene Hovgaard Christensen, Erik Damgaard |
author_sort |
Vested, Malene Hovgaard |
title |
Effect of Air Fraction on Force Coefficients in Oscillatory Flow |
title_short |
Effect of Air Fraction on Force Coefficients in Oscillatory Flow |
title_full |
Effect of Air Fraction on Force Coefficients in Oscillatory Flow |
title_fullStr |
Effect of Air Fraction on Force Coefficients in Oscillatory Flow |
title_full_unstemmed |
Effect of Air Fraction on Force Coefficients in Oscillatory Flow |
title_sort |
effect of air fraction on force coefficients in oscillatory flow |
publisher |
American Society of Mechanical Engineers |
publishDate |
2021 |
url |
https://orbit.dtu.dk/en/publications/3e6cb1b0-7c6d-4a5c-ba17-baf69a7c0758 https://doi.org/10.1115/OMAE2021-61122 |
long_lat |
ENVELOPE(-67.257,-67.257,-67.874,-67.874) |
geographic |
Breaker |
geographic_facet |
Breaker |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Vested , M H & Christensen , E D 2021 , Effect of Air Fraction on Force Coefficients in Oscillatory Flow . in Proceedings of the ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering . vol. 6: Ocean Engineering , V006T06A003 , American Society of Mechanical Engineers , 40th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2021) , 21/06/2021 . https://doi.org/10.1115/OMAE2021-61122 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1115/OMAE2021-61122 |
container_title |
Volume 6: Ocean Engineering |
_version_ |
1766295531220369408 |