Computational fluid dynamics of flow regime and hydrodynamic forces generated by a gliding North Atlantic right whale (Eubalaena glacialis)
Accurate estimates of drag on marine animals are required to investigate the locomotive cost, propulsive efficiency, and the impacts of entanglement if the animal is carrying fishing gear. In this study, we performed computational fluid dynamics analysis of a 10 m (length over all) right whale to ob...
Published in: | Marine Mammal Science |
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ftuglasgow:oai:eprints.gla.ac.uk:252337 2023-05-15T16:08:18+02:00 Computational fluid dynamics of flow regime and hydrodynamic forces generated by a gliding North Atlantic right whale (Eubalaena glacialis) Wu, Chen‐Yi Nowacek, Douglas P. Nousek‐McGregor, Anna E. McGregor, Ross Howle, Laurens E. 2021-07 text https://eprints.gla.ac.uk/252337/ https://eprints.gla.ac.uk/252337/1/252337.pdf en eng Wiley https://eprints.gla.ac.uk/252337/1/252337.pdf Wu, C.‐Y., Nowacek, D. P., Nousek‐McGregor, A. E. <http://eprints.gla.ac.uk/view/author/28386.html> , McGregor, R. and Howle, L. E. (2021) Computational fluid dynamics of flow regime and hydrodynamic forces generated by a gliding North Atlantic right whale (Eubalaena glacialis). Marine Mammal Science <https://eprints.gla.ac.uk/view/journal_volume/Marine_Mammal_Science.html>, 37(3), pp. 826-842. (doi:10.1111/mms.12798 <https://doi.org/10.1111/mms.12798>) Articles PeerReviewed 2021 ftuglasgow https://doi.org/10.1111/mms.12798 2022-09-22T22:16:52Z Accurate estimates of drag on marine animals are required to investigate the locomotive cost, propulsive efficiency, and the impacts of entanglement if the animal is carrying fishing gear. In this study, we performed computational fluid dynamics analysis of a 10 m (length over all) right whale to obtain baseline measurements of drag on the animal. Swimming speeds covering known right whale speed range (0.125 m/s to 8 m/s) were tested. We found a weak dependence between drag coefficient and Reynolds number. At a swimming speed of 2 m/s, we analyzed the boundary layer thicknesses, the flow regimes, and drag components. We found the thickest boundary layer at the lateral sides of the peduncle, whereas the boundary layer thickness over the outer part of the flukes was less than 1.7 cm. Laminar flow occurred over the anterior ~0.6 LoA and turbulent flow from ~0.8 LoA to the fluke notch. On the surfaces of the flukes outside of the body wake region, flow was laminar. Our most significant finding is that the drag coefficient (0.0071–0.0059) of a right whale for swimming speeds ranging from 0.25 m/s to 2 m/s is approximately twice that of many previous estimates for cetaceans. Article in Journal/Newspaper Eubalaena glacialis North Atlantic North Atlantic right whale University of Glasgow: Enlighten - Publications Marine Mammal Science 37 3 826 842 |
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Open Polar |
collection |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
English |
description |
Accurate estimates of drag on marine animals are required to investigate the locomotive cost, propulsive efficiency, and the impacts of entanglement if the animal is carrying fishing gear. In this study, we performed computational fluid dynamics analysis of a 10 m (length over all) right whale to obtain baseline measurements of drag on the animal. Swimming speeds covering known right whale speed range (0.125 m/s to 8 m/s) were tested. We found a weak dependence between drag coefficient and Reynolds number. At a swimming speed of 2 m/s, we analyzed the boundary layer thicknesses, the flow regimes, and drag components. We found the thickest boundary layer at the lateral sides of the peduncle, whereas the boundary layer thickness over the outer part of the flukes was less than 1.7 cm. Laminar flow occurred over the anterior ~0.6 LoA and turbulent flow from ~0.8 LoA to the fluke notch. On the surfaces of the flukes outside of the body wake region, flow was laminar. Our most significant finding is that the drag coefficient (0.0071–0.0059) of a right whale for swimming speeds ranging from 0.25 m/s to 2 m/s is approximately twice that of many previous estimates for cetaceans. |
format |
Article in Journal/Newspaper |
author |
Wu, Chen‐Yi Nowacek, Douglas P. Nousek‐McGregor, Anna E. McGregor, Ross Howle, Laurens E. |
spellingShingle |
Wu, Chen‐Yi Nowacek, Douglas P. Nousek‐McGregor, Anna E. McGregor, Ross Howle, Laurens E. Computational fluid dynamics of flow regime and hydrodynamic forces generated by a gliding North Atlantic right whale (Eubalaena glacialis) |
author_facet |
Wu, Chen‐Yi Nowacek, Douglas P. Nousek‐McGregor, Anna E. McGregor, Ross Howle, Laurens E. |
author_sort |
Wu, Chen‐Yi |
title |
Computational fluid dynamics of flow regime and hydrodynamic forces generated by a gliding North Atlantic right whale (Eubalaena glacialis) |
title_short |
Computational fluid dynamics of flow regime and hydrodynamic forces generated by a gliding North Atlantic right whale (Eubalaena glacialis) |
title_full |
Computational fluid dynamics of flow regime and hydrodynamic forces generated by a gliding North Atlantic right whale (Eubalaena glacialis) |
title_fullStr |
Computational fluid dynamics of flow regime and hydrodynamic forces generated by a gliding North Atlantic right whale (Eubalaena glacialis) |
title_full_unstemmed |
Computational fluid dynamics of flow regime and hydrodynamic forces generated by a gliding North Atlantic right whale (Eubalaena glacialis) |
title_sort |
computational fluid dynamics of flow regime and hydrodynamic forces generated by a gliding north atlantic right whale (eubalaena glacialis) |
publisher |
Wiley |
publishDate |
2021 |
url |
https://eprints.gla.ac.uk/252337/ https://eprints.gla.ac.uk/252337/1/252337.pdf |
genre |
Eubalaena glacialis North Atlantic North Atlantic right whale |
genre_facet |
Eubalaena glacialis North Atlantic North Atlantic right whale |
op_relation |
https://eprints.gla.ac.uk/252337/1/252337.pdf Wu, C.‐Y., Nowacek, D. P., Nousek‐McGregor, A. E. <http://eprints.gla.ac.uk/view/author/28386.html> , McGregor, R. and Howle, L. E. (2021) Computational fluid dynamics of flow regime and hydrodynamic forces generated by a gliding North Atlantic right whale (Eubalaena glacialis). Marine Mammal Science <https://eprints.gla.ac.uk/view/journal_volume/Marine_Mammal_Science.html>, 37(3), pp. 826-842. (doi:10.1111/mms.12798 <https://doi.org/10.1111/mms.12798>) |
op_doi |
https://doi.org/10.1111/mms.12798 |
container_title |
Marine Mammal Science |
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37 |
container_issue |
3 |
container_start_page |
826 |
op_container_end_page |
842 |
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1766404364325355520 |