A Non-Linear BEM–FEM Coupled Scheme for the Performance of Flexible Flapping-Foil Thrusters
Recent studies indicate that nature-inspired thrusters based on flexible oscillating foils show enhanced propulsive performance. However, understanding the underlying physics of the fluid–structure interaction (FSI) is essential to improve the efficiency of existing devices and pave the way for nove...
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| Published in: | Journal of marine science and engineering Vol. 8; no. 1; p. 56 |
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| Main Authors: | , , , |
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| Abstract | Recent studies indicate that nature-inspired thrusters based on flexible oscillating foils show enhanced propulsive performance. However, understanding the underlying physics of the fluid–structure interaction (FSI) is essential to improve the efficiency of existing devices and pave the way for novel energy-efficient marine thrusters. In the present work, we investigate the effect of chord-wise flexibility on the propulsive performance of flapping-foil thrusters. For this purpose, a numerical method has been developed to simulate the time-dependent structural response of the flexible foil that undergoes prescribed large general motions. The fluid flow model is based on potential theory, whereas the elastic response of the foil is approximated by means of the classical Kirchhoff–Love theory for thin plates under cylindrical bending. The fully coupled FSI problem is treated numerically with a non-linear BEM–FEM scheme. The validity of the proposed scheme is established through comparisons against existing works. The performance of the flapping-foil thrusters over a range of design parameters, including flexural rigidity, Strouhal number, heaving and pitching amplitudes is also studied. The results show a propulsive efficiency enhancement of up to 6% for such systems with moderate loss in thrust, compared to rigid foils. Finally, the present model after enhancement could serve as a useful tool in the design, assessment and control of flexible biomimetic flapping-foil thrusters. |
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| AbstractList | Recent studies indicate that nature-inspired thrusters based on flexible oscillating foils show enhanced propulsive performance. However, understanding the underlying physics of the fluid–structure interaction (FSI) is essential to improve the efficiency of existing devices and pave the way for novel energy-efficient marine thrusters. In the present work, we investigate the effect of chord-wise flexibility on the propulsive performance of flapping-foil thrusters. For this purpose, a numerical method has been developed to simulate the time-dependent structural response of the flexible foil that undergoes prescribed large general motions. The fluid flow model is based on potential theory, whereas the elastic response of the foil is approximated by means of the classical Kirchhoff–Love theory for thin plates under cylindrical bending. The fully coupled FSI problem is treated numerically with a non-linear BEM–FEM scheme. The validity of the proposed scheme is established through comparisons against existing works. The performance of the flapping-foil thrusters over a range of design parameters, including flexural rigidity, Strouhal number, heaving and pitching amplitudes is also studied. The results show a propulsive efficiency enhancement of up to 6% for such systems with moderate loss in thrust, compared to rigid foils. Finally, the present model after enhancement could serve as a useful tool in the design, assessment and control of flexible biomimetic flapping-foil thrusters. Recent studies indicate that nature-inspired thrusters based on flexible oscillating foils show enhanced propulsive performance. However, understanding the underlying physics of the fluid−structure interaction (FSI) is essential to improve the efficiency of existing devices and pave the way for novel energy-efficient marine thrusters. In the present work, we investigate the effect of chord-wise flexibility on the propulsive performance of flapping-foil thrusters. For this purpose, a numerical method has been developed to simulate the time-dependent structural response of the flexible foil that undergoes prescribed large general motions. The fluid flow model is based on potential theory, whereas the elastic response of the foil is approximated by means of the classical Kirchhoff−Love theory for thin plates under cylindrical bending. The fully coupled FSI problem is treated numerically with a non-linear BEM−FEM scheme. The validity of the proposed scheme is established through comparisons against existing works. The performance of the flapping-foil thrusters over a range of design parameters, including flexural rigidity, Strouhal number, heaving and pitching amplitudes is also studied. The results show a propulsive efficiency enhancement of up to 6% for such systems with moderate loss in thrust, compared to rigid foils. Finally, the present model after enhancement could serve as a useful tool in the design, assessment and control of flexible biomimetic flapping-foil thrusters. |
| Author | Anevlavi, Dimitra E. Filippas, Evangelos S. Karperaki, Angeliki E. Belibassakis, Kostas A. |
| Author_xml | – sequence: 1 givenname: Dimitra E. surname: Anevlavi fullname: Anevlavi, Dimitra E. – sequence: 2 givenname: Evangelos S. surname: Filippas fullname: Filippas, Evangelos S. – sequence: 3 givenname: Angeliki E. surname: Karperaki fullname: Karperaki, Angeliki E. – sequence: 4 givenname: Kostas A. surname: Belibassakis fullname: Belibassakis, Kostas A. |
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| Cites_doi | 10.1016/j.oceaneng.2013.06.028 10.1016/j.jfluidstructs.2016.03.010 10.1016/j.oceaneng.2017.08.055 10.1007/978-3-642-97146-4 10.1016/j.jfluidstructs.2011.10.005 10.1016/j.oceaneng.2018.02.028 10.1109/48.757275 10.1016/j.paerosci.2010.01.001 10.1063/1.4709477 10.1016/j.enganabound.2008.08.001 10.1016/S0376-0421(03)00077-0 10.1016/j.crme.2014.06.004 10.1016/j.oceaneng.2019.106712 10.2514/1.28565 10.1016/j.enganabound.2018.06.016 10.1016/j.jfluidstructs.2009.10.005 10.1016/j.jfluidstructs.2016.04.002 10.3390/jmse7120424 10.1146/annurev.fluid.32.1.33 10.1016/j.engstruct.2015.06.020 10.1016/j.apor.2015.04.009 10.1016/j.jfluidstructs.2017.01.009 10.1017/S0022112008003297 10.1121/1.1914673 10.1063/1.4939499 10.1016/j.enganabound.2003.10.004 10.14355/daoe.2016.05.001 10.1016/j.enganabound.2014.01.008 10.1017/S0022112079002494 10.1016/j.compfluid.2019.104325 10.1016/j.jfluidstructs.2017.04.003 10.1016/j.jfluidstructs.2016.09.003 10.1016/j.jfluidstructs.2015.07.003 10.1016/j.jfluidstructs.2014.09.006 10.1242/jeb.016279 10.1007/s00773-012-0169-y 10.1016/j.oceaneng.2014.04.002 10.1016/j.jfluidstructs.2014.01.002 10.1109/OCEANSE.2019.8867084 10.1016/j.jfluidstructs.2017.02.001 10.1016/j.apor.2016.02.002 10.1016/j.joes.2017.03.003 10.1201/9780849384165 |
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| SubjectTerms | Autonomous underwater vehicles Biomimetics Computational fluid dynamics coupled bem–fem Deformation Design parameters Efficiency Energy efficiency Finite element method Flapping Flexibility flexible flapping foils Fluid flow Fluid-structure interaction hydroelasticity Investigations Kirchhoff theory Mathematical models Methods Numerical analysis Numerical methods Physics Pitching Potential theory Propulsive efficiency Rigidity Simulation Strouhal number Swimming Thin plates Thrusters unsteady marine thruster |
| Title | A Non-Linear BEM–FEM Coupled Scheme for the Performance of Flexible Flapping-Foil Thrusters |
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