CFD study of aquatic thrust generation by an octopus-like arm under intense prescribed deformations

Asimina Kazakidi; Dimitris P. Tsakiris; Dionysios Angelidis; Fotis Sotiropoulos; John A. Ekaterinaris

doi:10.1016/j.compfluid.2015.03.009

CFD study of aquatic thrust generation by an octopus-like arm under intense prescribed deformations

Asimina Kazakidi, Dimitris P. Tsakiris, Dionysios Angelidis, Fotis Sotiropoulos, John A. Ekaterinaris

Civil, Environmental, and Geo- Engineering

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

The complexity in structure and locomotion of cephalopods, such as the octopus, poses difficulties in modeling and simulation. Their slender arms, being highly agile and dexterous, often involve intense deformations, which are hard to simulate accurately, while simultaneously ensuring numerical stability and low diffusion of the transient motion results. Within the immersed-boundary framework, this paper focuses on an arm geometry performing prescribed motions that reflect octopus locomotion. The method is compared with a finite-volume numerical approach to determine the mesh requirements that must be employed for sufficiently capturing, not only the near wall viscous flow, but also the off-body vortical flow field in intense forced motions. The objective is to demonstrate and exploit the generality of the immersed boundary approach to complex numerical simulations of deforming geometries. Incorporation of arm deformation was found to increase the output thrust of a single-arm system. It was further found that sculling motion combined with arm undulations provides an effective propulsive scheme for an octopus-like arm.

Original language	English (US)
Pages (from-to)	54-65
Number of pages	12
Journal	Computers and Fluids
Volume	115
DOIs	https://doi.org/10.1016/j.compfluid.2015.03.009
State	Published - Jul 2 2015

Bibliographical note

Funding Information:
This work was supported in part by the European Commission (EC) and the General Secretariat for Research and Technology (GSRT) of the Hellenic Ministry of Education via the ESF-GSRT HYDRO-ROB Project [ PE7(281) ] and the EC-ERDF BIOSYS-KRIPIS Project [ MIS-448301 (2013SE01380036) ]. Parts of these simulations were carried out on the CaSToRC High-Performance Computing (HPC) system of the LINKSCEEM/Cy-Tera resources (Project pro14a108) and the PRACE Tier-1 HPC system (Project CepFlow, 12DECI0048). The authors would like to thank B. Hochner, T. Flash, M. Sfakiotakis, X. Zabulis, M. Kuba, J. Oikonomidis, A. Chatzidaki, Th. Evdaimon, and S. Stefanou, for their assistance with these studies.

Publisher Copyright:
© 2015 Elsevier Ltd.

Keywords

Aquatic locomotion
Biological propulsion
Computational fluid dynamics (CFD)
Immersed boundary method
Large deformations

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10.1016/j.compfluid.2015.03.009

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title = "CFD study of aquatic thrust generation by an octopus-like arm under intense prescribed deformations",

abstract = "The complexity in structure and locomotion of cephalopods, such as the octopus, poses difficulties in modeling and simulation. Their slender arms, being highly agile and dexterous, often involve intense deformations, which are hard to simulate accurately, while simultaneously ensuring numerical stability and low diffusion of the transient motion results. Within the immersed-boundary framework, this paper focuses on an arm geometry performing prescribed motions that reflect octopus locomotion. The method is compared with a finite-volume numerical approach to determine the mesh requirements that must be employed for sufficiently capturing, not only the near wall viscous flow, but also the off-body vortical flow field in intense forced motions. The objective is to demonstrate and exploit the generality of the immersed boundary approach to complex numerical simulations of deforming geometries. Incorporation of arm deformation was found to increase the output thrust of a single-arm system. It was further found that sculling motion combined with arm undulations provides an effective propulsive scheme for an octopus-like arm.",

keywords = "Aquatic locomotion, Biological propulsion, Computational fluid dynamics (CFD), Immersed boundary method, Large deformations",

author = "Asimina Kazakidi and Tsakiris, {Dimitris P.} and Dionysios Angelidis and Fotis Sotiropoulos and Ekaterinaris, {John A.}",

note = "Funding Information: This work was supported in part by the European Commission (EC) and the General Secretariat for Research and Technology (GSRT) of the Hellenic Ministry of Education via the ESF-GSRT HYDRO-ROB Project [ PE7(281) ] and the EC-ERDF BIOSYS-KRIPIS Project [ MIS-448301 (2013SE01380036) ]. Parts of these simulations were carried out on the CaSToRC High-Performance Computing (HPC) system of the LINKSCEEM/Cy-Tera resources (Project pro14a108) and the PRACE Tier-1 HPC system (Project CepFlow, 12DECI0048). The authors would like to thank B. Hochner, T. Flash, M. Sfakiotakis, X. Zabulis, M. Kuba, J. Oikonomidis, A. Chatzidaki, Th. Evdaimon, and S. Stefanou, for their assistance with these studies. Publisher Copyright: {\textcopyright} 2015 Elsevier Ltd.",

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doi = "10.1016/j.compfluid.2015.03.009",

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AU - Kazakidi, Asimina

AU - Tsakiris, Dimitris P.

AU - Angelidis, Dionysios

AU - Sotiropoulos, Fotis

AU - Ekaterinaris, John A.

N1 - Funding Information: This work was supported in part by the European Commission (EC) and the General Secretariat for Research and Technology (GSRT) of the Hellenic Ministry of Education via the ESF-GSRT HYDRO-ROB Project [ PE7(281) ] and the EC-ERDF BIOSYS-KRIPIS Project [ MIS-448301 (2013SE01380036) ]. Parts of these simulations were carried out on the CaSToRC High-Performance Computing (HPC) system of the LINKSCEEM/Cy-Tera resources (Project pro14a108) and the PRACE Tier-1 HPC system (Project CepFlow, 12DECI0048). The authors would like to thank B. Hochner, T. Flash, M. Sfakiotakis, X. Zabulis, M. Kuba, J. Oikonomidis, A. Chatzidaki, Th. Evdaimon, and S. Stefanou, for their assistance with these studies. Publisher Copyright: © 2015 Elsevier Ltd.

PY - 2015/7/2

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N2 - The complexity in structure and locomotion of cephalopods, such as the octopus, poses difficulties in modeling and simulation. Their slender arms, being highly agile and dexterous, often involve intense deformations, which are hard to simulate accurately, while simultaneously ensuring numerical stability and low diffusion of the transient motion results. Within the immersed-boundary framework, this paper focuses on an arm geometry performing prescribed motions that reflect octopus locomotion. The method is compared with a finite-volume numerical approach to determine the mesh requirements that must be employed for sufficiently capturing, not only the near wall viscous flow, but also the off-body vortical flow field in intense forced motions. The objective is to demonstrate and exploit the generality of the immersed boundary approach to complex numerical simulations of deforming geometries. Incorporation of arm deformation was found to increase the output thrust of a single-arm system. It was further found that sculling motion combined with arm undulations provides an effective propulsive scheme for an octopus-like arm.

AB - The complexity in structure and locomotion of cephalopods, such as the octopus, poses difficulties in modeling and simulation. Their slender arms, being highly agile and dexterous, often involve intense deformations, which are hard to simulate accurately, while simultaneously ensuring numerical stability and low diffusion of the transient motion results. Within the immersed-boundary framework, this paper focuses on an arm geometry performing prescribed motions that reflect octopus locomotion. The method is compared with a finite-volume numerical approach to determine the mesh requirements that must be employed for sufficiently capturing, not only the near wall viscous flow, but also the off-body vortical flow field in intense forced motions. The objective is to demonstrate and exploit the generality of the immersed boundary approach to complex numerical simulations of deforming geometries. Incorporation of arm deformation was found to increase the output thrust of a single-arm system. It was further found that sculling motion combined with arm undulations provides an effective propulsive scheme for an octopus-like arm.

KW - Aquatic locomotion

KW - Biological propulsion

KW - Computational fluid dynamics (CFD)

KW - Immersed boundary method

KW - Large deformations

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JO - Computers and Fluids

JF - Computers and Fluids

ER -

CFD study of aquatic thrust generation by an octopus-like arm under intense prescribed deformations

Abstract

Bibliographical note

Keywords

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