A computational fluid dynamic study of intense cephalopod-like motions

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

Research output: Contribution to conferencePaper

3 Citations (Scopus)

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 that are hard to simulate accurately, while ensuring numerical stability and low diffusion of the transient motion results. Within the immersed-boundary and the finite-volume frameworks, this paper focuses on geometries performing prescribed motions that reflect cephalopod locomotion. Both numerical approaches are used 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 appears to increase the output thrust of a single-arm system. It was further found that sculling motion combined with arm undulation is an effective propulsive scheme for a cephalopod-like arm.

Conference

Conference44th AIAA Fluid Dynamics Conference 2014
CountryUnited States
CityAtlanta, GA
Period16/06/1420/06/14

Fingerprint

Computational fluid dynamics
Geometry
Convergence of numerical methods
Viscous flow
Flow fields
Computer simulation

Keywords

  • computational fluid dynamics
  • computer simulation
  • deformation

Cite this

Kazakidi, A., Tsakiris, D. P., Sotiropoulos, F., & Ekaterinaris, J. A. (2014). A computational fluid dynamic study of intense cephalopod-like motions. Paper presented at 44th AIAA Fluid Dynamics Conference 2014, Atlanta, GA, United States. https://doi.org/10.2514/6.2014-2504
Kazakidi, Asimina ; Tsakiris, Dimitris P. ; Sotiropoulos, Fotis ; Ekaterinaris, John A. / A computational fluid dynamic study of intense cephalopod-like motions. Paper presented at 44th AIAA Fluid Dynamics Conference 2014, Atlanta, GA, United States.15 p.
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Kazakidi, A, Tsakiris, DP, Sotiropoulos, F & Ekaterinaris, JA 2014, 'A computational fluid dynamic study of intense cephalopod-like motions' Paper presented at 44th AIAA Fluid Dynamics Conference 2014, Atlanta, GA, United States, 16/06/14 - 20/06/14, . https://doi.org/10.2514/6.2014-2504

A computational fluid dynamic study of intense cephalopod-like motions. / Kazakidi, Asimina; Tsakiris, Dimitris P.; Sotiropoulos, Fotis; Ekaterinaris, John A.

2014. Paper presented at 44th AIAA Fluid Dynamics Conference 2014, Atlanta, GA, United States.

Research output: Contribution to conferencePaper

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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 that are hard to simulate accurately, while ensuring numerical stability and low diffusion of the transient motion results. Within the immersed-boundary and the finite-volume frameworks, this paper focuses on geometries performing prescribed motions that reflect cephalopod locomotion. Both numerical approaches are used 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 appears to increase the output thrust of a single-arm system. It was further found that sculling motion combined with arm undulation is an effective propulsive scheme for a cephalopod-like arm.

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Kazakidi A, Tsakiris DP, Sotiropoulos F, Ekaterinaris JA. A computational fluid dynamic study of intense cephalopod-like motions. 2014. Paper presented at 44th AIAA Fluid Dynamics Conference 2014, Atlanta, GA, United States. https://doi.org/10.2514/6.2014-2504