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Flexible Margin Kinematics and Vortex Formation of Aurelia aurita and Robojelly
The development of a rowing jellyfish biomimetic robot termed as “Robojelly”, has led to the discovery of a passive flexible flap located between the flexion point and bell margin on the Aurelia aurita. A comparative analysis of biomimetic robots showed that the presence of a passive flexible flap r...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4048192/ https://www.ncbi.nlm.nih.gov/pubmed/24905025 http://dx.doi.org/10.1371/journal.pone.0098310 |
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author | Villanueva, Alex Vlachos, Pavlos Priya, Shashank |
author_facet | Villanueva, Alex Vlachos, Pavlos Priya, Shashank |
author_sort | Villanueva, Alex |
collection | PubMed |
description | The development of a rowing jellyfish biomimetic robot termed as “Robojelly”, has led to the discovery of a passive flexible flap located between the flexion point and bell margin on the Aurelia aurita. A comparative analysis of biomimetic robots showed that the presence of a passive flexible flap results in a significant increase in the swimming performance. In this work we further investigate this concept by developing varying flap geometries and comparing their kinematics with A. aurita. It was shown that the animal flap kinematics can be replicated with high fidelity using a passive structure and a flap with curved and tapered geometry gave the most biomimetic performance. A method for identifying the flap location was established by utilizing the bell curvature and the variation of curvature as a function of time. Flaps of constant cross-section and varying lengths were incorporated on the Robojelly to conduct a systematic study of the starting vortex circulation. Circulation was quantified using velocity field measurements obtained from planar Time Resolved Digital Particle Image Velocimetry (TRDPIV). The starting vortex circulation was scaled using a varying orifice model and a pitching panel model. The varying orifice model which has been traditionally considered as the better representation of jellyfish propulsion did not appear to capture the scaling of the starting vortex. In contrast, the pitching panel representation appeared to better scale the governing flow physics and revealed a strong dependence on the flap kinematics and geometry. The results suggest that an alternative description should be considered for rowing jellyfish propulsion, using a pitching panel method instead of the traditional varying orifice model. Finally, the results show the importance of incorporating the entire bell geometry as a function of time in modeling rowing jellyfish propulsion. |
format | Online Article Text |
id | pubmed-4048192 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-40481922014-06-09 Flexible Margin Kinematics and Vortex Formation of Aurelia aurita and Robojelly Villanueva, Alex Vlachos, Pavlos Priya, Shashank PLoS One Research Article The development of a rowing jellyfish biomimetic robot termed as “Robojelly”, has led to the discovery of a passive flexible flap located between the flexion point and bell margin on the Aurelia aurita. A comparative analysis of biomimetic robots showed that the presence of a passive flexible flap results in a significant increase in the swimming performance. In this work we further investigate this concept by developing varying flap geometries and comparing their kinematics with A. aurita. It was shown that the animal flap kinematics can be replicated with high fidelity using a passive structure and a flap with curved and tapered geometry gave the most biomimetic performance. A method for identifying the flap location was established by utilizing the bell curvature and the variation of curvature as a function of time. Flaps of constant cross-section and varying lengths were incorporated on the Robojelly to conduct a systematic study of the starting vortex circulation. Circulation was quantified using velocity field measurements obtained from planar Time Resolved Digital Particle Image Velocimetry (TRDPIV). The starting vortex circulation was scaled using a varying orifice model and a pitching panel model. The varying orifice model which has been traditionally considered as the better representation of jellyfish propulsion did not appear to capture the scaling of the starting vortex. In contrast, the pitching panel representation appeared to better scale the governing flow physics and revealed a strong dependence on the flap kinematics and geometry. The results suggest that an alternative description should be considered for rowing jellyfish propulsion, using a pitching panel method instead of the traditional varying orifice model. Finally, the results show the importance of incorporating the entire bell geometry as a function of time in modeling rowing jellyfish propulsion. Public Library of Science 2014-06-06 /pmc/articles/PMC4048192/ /pubmed/24905025 http://dx.doi.org/10.1371/journal.pone.0098310 Text en © 2014 Villanueva et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited. |
spellingShingle | Research Article Villanueva, Alex Vlachos, Pavlos Priya, Shashank Flexible Margin Kinematics and Vortex Formation of Aurelia aurita and Robojelly |
title | Flexible Margin Kinematics and Vortex Formation of Aurelia aurita and Robojelly |
title_full | Flexible Margin Kinematics and Vortex Formation of Aurelia aurita and Robojelly |
title_fullStr | Flexible Margin Kinematics and Vortex Formation of Aurelia aurita and Robojelly |
title_full_unstemmed | Flexible Margin Kinematics and Vortex Formation of Aurelia aurita and Robojelly |
title_short | Flexible Margin Kinematics and Vortex Formation of Aurelia aurita and Robojelly |
title_sort | flexible margin kinematics and vortex formation of aurelia aurita and robojelly |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4048192/ https://www.ncbi.nlm.nih.gov/pubmed/24905025 http://dx.doi.org/10.1371/journal.pone.0098310 |
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