Effect of wavelength of fish-like undulation of a hydrofoil in a free-stream flow

Thekkethil, Namshad; Shrivastava, Mukul; Agrawal, Amit; Sharma, Atul

doi:10.1007/s12046-017-0619-7

Cited by 12 publications

(4 citation statements)

References 26 publications

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“…When

, a pressure difference originated on both the pressure and suction sides of the caudal fin, thereby playing a pivotal role in the net thrust force generation. Conversely, when

, the undulation of the fish’s body resulted in a momentum transfer to the surrounding fluid, which aligned with the observations made by Tekkethil et al [ 72 ].…”

Section: Resultssupporting

confidence: 89%

Numerical Investigation of Dimensionless Parameters in Carangiform Fish Swimming Hydrodynamics

Macías,

García-Ortiz,

Oliveira

et al. 2024

Biomimetics

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Research into how fish and other aquatic organisms propel themselves offers valuable natural references for enhancing technology related to underwater devices like vehicles, propellers, and biomimetic robotics. Additionally, such research provides insights into fish evolution and ecological dynamics. This work carried out a numerical investigation of the most relevant dimensionless parameters in a fish swimming environment (Reynolds Re, Strouhal St, and Slip numbers) to provide valuable knowledge in terms of biomechanics behavior. Thus, a three-dimensional numerical study of the fish-like lambari, a BCF swimmer with carangiform kinematics, was conducted using the URANS approach with the k-ω-SST transition turbulence closure model in the OpenFOAM software. In this study, we initially reported the equilibrium Strouhal number, which is represented by St∗, and its dependence on the Reynolds number, denoted as Re. This was performed following a power–law relationship of St∝Re(−α). We also conducted a comprehensive analysis of the hydrodynamic forces and the effect of body undulation in fish on the production of swimming drag and thrust. Additionally, we computed propulsive and quasi-propulsive efficiencies, as well as examined the influence of the Reynolds number and Slip number on fish performance. Finally, we performed a vortex dynamics analysis, in which different wake configurations were revealed under variations of the dimensionless parameters St, Re, and Slip. Furthermore, we explored the relationship between the generation of a leading-edge vortex via the caudal fin and the peak thrust production within the motion cycle.

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“…When

, a pressure difference originated on both the pressure and suction sides of the caudal fin, thereby playing a pivotal role in the net thrust force generation. Conversely, when

, the undulation of the fish’s body resulted in a momentum transfer to the surrounding fluid, which aligned with the observations made by Tekkethil et al [ 72 ].…”

Section: Resultssupporting

confidence: 89%

Numerical Investigation of Dimensionless Parameters in Carangiform Fish Swimming Hydrodynamics

Macías,

García-Ortiz,

Oliveira

et al. 2024

Biomimetics

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“…The wake morphology as shown in Figure 7 has a similar structure to the wake patterns reported in previous 2D FSI simulations (Gronskis & Artana, 2016;Kern & Koumoutsakos, 2006;Namshad, Shrivastava, Agrawal, & Sharma, 2017). The Reynolds number Re = 4280 is close to the reported value Re = 3857 (Kern & Koumoutsakos, 2006).…”

Section: Discussionsupporting

confidence: 85%

Simulations of self-propelled anguilliform swimming using the immersed boundary method in OpenFOAM

Feng

Wang

Todd

et al. 2019

Engineering Applications of Computational Fluid Mechanics

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This study extends the existing immersed boundary method (IBM) in the open source toolbox OpenFOAM for solving fluid-structure interactions involving the immersed structure with changeable shapes. To handle a changeable-shape problem, the existing discrete-forcing direct-imposition approach of IBM in OpenFOAM with a pressure-implicit split-operator (PISO) solver is used to solve the fluid domain with interpolated immersed boundary conditions. In the solved fluid domain, the interactions between the fluid domain and the immersed structure are calculated. Making use of these interactions, a user-defined solid solver is applied to compute and update the boundary conditions on the immersed structure. To validate this methodology, models of anguilliform swimming, a typical FSI problem with moving boundaries which has been well studied, is simulated. The accuracy of the present work is examined by comparing the numerical results with the published data. In simulations, anguilliform swimmers are modeled as deformable immersed boundaries. The immersed swimmers propagate in a path determined by the forces from the surrounding fluid acting upon their bodies, as generated by their prescribed changing shapes. The results including the velocity, the thrust, the wake morphology, and the force distribution along the immersed boundaries are presented and discussed. The good agreement of the computational results with reported works validates the extension of IBM in OpenFOAM. ARTICLE HISTORY

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“…For the separate verification of the fluid flow solver, a one‐way coupled fluid and moving rigid‐structure problem is considered where a forced motion is prescribed to the structure (used as the BC at the fluid‐solid interface). The FVM‐ and LS‐IIM‐based present fluid flow solver has been validated/verified in our previous works() for an oscillating cylinder, pitching foil, and undulating foil. The earlier solver used the conventional advection and reinitialisation equations for level set function, whereas the present solver uses the minimum distance and winding number algorithm–based approach.…”

Section: Verification and Validation Study For The Present Ls‐iimmentioning

confidence: 90%

Level set function–based immersed interface method and benchmark solutions for fluid flexible‐structure interaction

Thekkethil

Sharma

2019

Numerical Methods in Fluids

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Summary Using a hybrid Lagrangian‐Eulerian approach, a level set function–based immersed interface method (LS‐IIM) is proposed for the interaction of a flexible body immersed in a fluid flow. The LS‐IIM involves finite volume method for the fluid solver, Galerkin finite element method for the structural solver, and a block‐iterative partitioned method–based fully implicit coupling between the two solvers. The novelty of the proposed method is a level set function–based direct implementation of fluid‐solid interface boundary conditions in both the solvers. Another novelty is the computation of the level set function from a geometric method instead of differential equations commonly used in level set methods—the novel geometric as compared to the traditional method is found to be more accurate and less time‐consuming. The LS‐IIM is demonstrated as second‐order accurate. Verification study is presented first separately for both the solvers and then together for four fluid‐structure interaction (FSI) problems, with different levels of complexity including lid‐driven flow, channel flow, and free‐stream flow. Benchmark solutions are presented for two class of FSI problems: first, easy to set up and less time‐consuming and, second, a reasonably challenging and complex FSI problem involving sharp edges and forced‐motion of the flexible structure. The benchmark solutions are proposed at steady state for the first problem, after a verification study with two open‐source solvers and, at periodic state, after a validation with published experimental results for the second problem. Our benchmark solutions may be useful for verification study in future.

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Effect of wavelength of fish-like undulation of a hydrofoil in a free-stream flow

Cited by 12 publications

References 26 publications

Numerical Investigation of Dimensionless Parameters in Carangiform Fish Swimming Hydrodynamics

Numerical Investigation of Dimensionless Parameters in Carangiform Fish Swimming Hydrodynamics

Simulations of self-propelled anguilliform swimming using the immersed boundary method in OpenFOAM

Level set function–based immersed interface method and benchmark solutions for fluid flexible‐structure interaction

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