Numerical analysis of active chordwise flexibility on the performance of non-symmetrical flapping airfoils

Tay, Wee Beng; Lim, Kah Bin

doi:10.1016/j.jfluidstructs.2009.10.005

Cited by 30 publications

(27 citation statements)

References 17 publications

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“…Wing flexibility in flapping micro aerial vehicles has been investigated in many ways [1][2][3][4][5][6][7] due to its potential to improve efficiency, lift and thrust. These investigations can in general be classified into two types: prescribed (active) flexibility [1,4,7], or fluid structure interaction (FSI) induced (passive) flexibility [2,3,5].…”

Section: Introductionmentioning

confidence: 99%

“…These investigations can in general be classified into two types: prescribed (active) flexibility [1,4,7], or fluid structure interaction (FSI) induced (passive) flexibility [2,3,5]. In the first scenario, Miao and Ho [1] used FLUENT to investigate the effect of chord-wise flexibility on the aerodynamic characteristics for a flapping airfoil with various combinations of Reynolds number (Re) and reduced frequency (k).…”

Section: Introductionmentioning

confidence: 99%

“…Results show the formation of leading edge vortex (LEV), with improvement in both the efficiency and thrust. Tay and Lim [4] extended the previous works by investigating additional factors such as flexing center location, standard two-sided flexing as well as a type of single-sided flexing using their own in-house Navier-Stokes solver. Results show that with the correct parameters, efficiency and thrust coefficient increase to as high as 0.76 and 3.57 respectively.…”

Section: Introductionmentioning

confidence: 99%

“…In the paper by Tay and Lim [4], their 2D flapping wing simulations show great improvements in the efficiency, lift and thrust with their prescribed symmetrical and non-symmetrical flexibility. However, their study is restricted to 2D only.…”

Section: Introductionmentioning

confidence: 99%

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Symmetrical and non-symmetrical 3D wing deformation of flapping micro aerial vehicles

Tay

2016

Aerospace Science and Technology

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Symmetrical and non-symmetrical 3D wing deformation of flapping micro aerial vehicles

Tay

2016

Aerospace Science and Technology

Self Cite

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“…This study revealed that flexibility in the fin leads to some span-wise curvature, which if smartly induced can increase thrust and propulsive efficiency. Numerical modeling of flexible body hydrodynamics has been successfully implemented and the benefits of fin flexion control were reinforced [32,33,34]. More recently, the importance to the hydrodynamics of chord-wise traveling waves (shown by Rosenberger, 2001 [5]) has been shown where chord-wise traveling wave motion is important in wake structure formation and hydrodynamic performance [15,37,39].…”

Section: Hydrodynamics Backgroundmentioning

confidence: 99%

Biomechanical Modeling of Ray Pectoral Fins to Inform the Design of AUV Propulsion Systems

Russo¹

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The ongoing demand for higher performing unmanned underwater vehicle systems for military and exploratory applications calls for unprecedented approaches to researching and developing new technologies. Autonomous Underwater Vehicles (AUVs), like their aerial counterparts (UAVs), are a type of naval craft that can carry out missions with minimal or no human interaction. The ever-increasing mission complexity of underwater vehicles has driven engineers and scientists to explore new sources of inspiration for the design of AUV propulsion systems. Fortunately, the many examples of successful underwater propulsion systems can be found in nature, such as the flapping fins of fish or undulating bodies of eels. Since there are literally thousands of examples in nature of how underwater propulsion can be achieved, it is important to realize which types of biological propulsion systems might be best for inspiring artificial propulsions systems for use in AUVs. In the present study, the mechanics of the pectoral fins of skates and rays is investigated to elucidate the underlying mechanisms responsible for their impressive propulsive ability. Batoid rays are of significant interest due to their unique body construct and performance characteristics with their pectoral fins used for both propulsion and control. Although the highly functioning fins of batoids have been recognized, the biomechanics behind their function is not well understood. Therefore the goal of this research is to investigate the musculoskeletal system of batoid rays, identify key biomechanical design features, elucidate the role of musculoskeletal design on fin kinematics and hydrodynamics, and to apply the lessons learned to the design of AUV propulsion systems.Computerized Tomography (CT) scans of the cownose ray (Rhinoptera bonasus) and Atlantic ray (Dasyatis sabina) skeletons reveal a complex system of cartilaginous joints and segments that provide for the support structure of batoid fins. Features of the skeletal design believed to be important for kinematics and propulsion were identified. A biomechanical model of the skeletal structure was developed to simulate ray swimming kinematics and uncover the role of skeletal design on kinematics. The biomechanical model was then interfaced with an advanced panel method Computational Fluid Dynamics (CFD) model to establish a link between the skeletal structure and hydrodynamic performance, and an investigation into the role of skeletal design on hydrodynamics was conducted. Lastly, the applicability of skeletal design features of biology to the design of AUV propulsion systems was explored through the design, fabrication, and testing of bio-inspired artificial pectoral fin skeletons.The development of the biomechanical model with fluid-structure interaction can be used as a tool for transferring the biological design principles of ray fins to the design of artificial systems for AUV propulsion. Ultimately, the objective of this work was to establish an interface between biology and engineering to aid...

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Development and Performance Analysis of Pneumatic Soft‐Bodied Bionic Flipper

Zhao

Lim

et al. 2022

Adv Eng Mater

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The sea lion fore flipper has superior underwater movement performance. Its structural characteristics and propulsion mechanism are drawn, combined with the large deformation and hyperelastic properties of silicone, a pneumatic soft‐bodied bionic flipper with strong underwater mobility, good environmental adaptability, and flexible attitude transformation. Based on Yeoh's second‐order constitutive model of silicone, the nonlinear dynamic analysis of the main limb of the bionic flipper is carried out, and the deformation analysis theoretical model is established. Then, the force analysis of infinitesimal and integral of the wing fin of the bionic flipper is analyzed by the blade element theory, to obtain the theoretical model of underwater propulsion dynamic performance. The superiority of the hydrodynamic performance of the bionic flipper is analyzed and confirmed using the bidirectional fluid–structure coupling numerical simulation algorithm. An experimental test platform is built to test the physical model of the bionic flipper. The motion and dynamic characteristics curves of the bionic flipper are obtained and compared with the corresponding numerical simulation results. The results show that the theoretical model and numerical simulation are accurate, and the structure is feasible, which can provide methods and references for the research and implementation of the underwater propeller.

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Numerical analysis of active chordwise flexibility on the performance of non-symmetrical flapping airfoils

Cited by 30 publications

References 17 publications

Symmetrical and non-symmetrical 3D wing deformation of flapping micro aerial vehicles

Symmetrical and non-symmetrical 3D wing deformation of flapping micro aerial vehicles

Biomechanical Modeling of Ray Pectoral Fins to Inform the Design of AUV Propulsion Systems

Development and Performance Analysis of Pneumatic Soft‐Bodied Bionic Flipper

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