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Article
Engineering, Mechanical
Jiakun Han et al.
Summary: This study investigates the transient effects during transitions of bio-inspired flapping foils between different schooling configurations. Numerical simulations and experiments demonstrate an optimal energy-saving transition mode and provide insights for the design of bio-inspired vehicle clusters.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Mechanical
Lishu Hao et al.
Summary: The experimental study on the effects of bionic flap on airfoil performance showed that bionic flaps can improve airfoil stall characteristics at different angles of attack. They significantly enhance lift characteristics and can increase the maximum lift coefficient by 3.9%.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Marine
Pavel A. Trapper
Summary: This paper proposes a simple numerical technique for calculating internal force envelope diagrams for offshore pipelines. The entire pipeline is modeled as a continuous segment, considering the geometric nonlinearity induced by large deformations. The results show that seafloor irregularities generally lead to an increase in maximum internal force values at certain locations. This technique provides a time-saving alternative to commercial special-purpose finite element software.
Article
Mechanics
Chunyu Wang et al.
Summary: Birds and bats can enhance aerodynamic performance through a combination of flapping and local sweep morphing, providing a possible approach for improving micro aerial vehicles.
Article
Mechanics
Yuehao Sun et al.
Summary: This article investigates the dynamics of a two-dimensional flow over a rigid flat plate with a trailing closed flexible filament acting as a deformable afterbody. Numerical methods are used to study the flow patterns and dynamics of the rigid-flexible coupling system and to explore the effects of Reynolds number and length ratio. The study identifies five typical state modes based on the filament shape and dynamics and demonstrates the significant drag reduction achieved by utilizing the flexible filament.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Chhote Lal Shah et al.
Summary: This study investigates the effect of a chordwise flexible aft-tail of a rigid heaving aerofoil on the dynamical transitions of the trailing-wake. It is found that introducing a moderately flexible tail can regularize the intermittent dynamics and eliminate the jet-switching phenomenon. Changing the length of the tail controls its flexibility, allowing for regular and periodic flow.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Physics, Fluids & Plasmas
Nirmal J. Nair et al.
Summary: Birds are able to perform complex maneuvers at post-stall angles of attack using their passive, adaptive flow control paradigm provided by self-actuating covert feathers. The performance benefits and flow physics of this system have not been fully explored.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Engineering, Mechanical
Zengzhi Du et al.
Summary: This study investigates the effects of biomimetic shark scales with fixed tilt angles on flow separation over an inclined plate. The results show that the tilted biomimetic shark scales decrease the reattachment length and enhance fluid convection and vorticity convection. This improves the normal motions of fluid in the separated shear layer and provides energy to resist flow separation.
EXPERIMENTS IN FLUIDS
(2022)
Article
Engineering, Mechanical
Artur Reiswich et al.
Summary: This study investigates the effects of self-adaptive and flexible flaps on the performance of low Reynolds number airfoils using wind tunnel experiments. The results show that airfoils with flaps perform better near the stall regime compared to flapless airfoils. By employing stereo vision technique, the non-harmonic oscillatory behavior of the flaps is observed.
JOURNAL OF FLUIDS AND STRUCTURES
(2022)
Article
Mechanics
Zhijian Wu et al.
Summary: The conventional immersed boundary-lattice Boltzmann coupling schemes cannot accurately satisfy the non-slip boundary condition in fluid-structure interaction problems, leading to the proposal of an improved iterative velocity correction procedure. This procedure introduces a modified velocity operator to solve the problem of insufficient interpolation accuracy. By modifying the particle distribution function and performing the evolution governing equation of the multiple relaxation time-lattice Boltzmann method, the proposed coupling method ensures the non-slip boundary condition and improves the accuracy of solid boundaries in viscous and shearing flows. The numerical framework established for coupling lattice Boltzmann and finite element methods proves the efficiency of the method in transient problems involving FSI.
Editorial Material
Mechanics
Dimitris Drikakis et al.
Article
Physics, Fluids & Plasmas
Nirmal J. Nair et al.
Summary: This study investigates the aerodynamic benefits of covert-inspired passive flow control devices through numerical simulations and parameter studies. The results show that these devices can improve aerodynamic lift by up to 25% by preventing reverse flow and modulating the surrounding flow.
Article
Engineering, Aerospace
Khanh Nguyen et al.
Summary: This study investigates the effects of wing kinematics, corrugation structures, and clap-and-fling on the aerodynamic efficiency of a flapping-wing micro air vehicle. It is found that modified wing kinematics version 3 improved the lift-to-drag ratio by 24%, and distributed wing corrugations slightly augmented the L/D by 2%. Clap-and-fling behavior, however, contributed to a 5% increase in lift but a 9% increase in drag, leading to a 4% reduction in L/D.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Yaoming Zhou et al.
Summary: This paper proposes a bio-inspired path planning algorithm in 3D space that mimics the basic mechanisms of plant growth, allowing UAV to dynamically avoid obstacles in unknown environment maps. It has fast path planning speed, low delay real-time planning effect, and its feasibility is verified in the Gazebo simulator based on the ROS platform.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Thermodynamics
Wenxing Hao et al.
Summary: The study demonstrates that adaptive flap can effectively alleviate flow separation problems in vertical axis wind turbine and increase the blades' aerodynamic torque. Short flap can avoid the negative impact of long flaps, and performs better when located far from the blade leading edge.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Mechanics
G. Farag et al.
Summary: A new Taylor-expansion lattice-Boltzmann model is proposed, reinterpreting the collision kernel as a closure for the stress-tensor equation. Numerical coupling with other schemes results in error terms with more complex scalings than those obtained via Chapman-Enskog. Different models are carefully analyzed through this new perspective, shedding new light on their consistency with the Navier-Stokes equations.
Article
Mechanics
Wei Wang et al.
Summary: The vortex-induced vibration (VIV) responses of a cactus-inspired cylinder with ribs were numerically investigated, showing that increasing the number of ribs can suppress VIV responses and reduce the amplitude ratios. Additionally, the lock-in region becomes wider as the number of ribs increases.
Article
Mechanics
Gholamreza Kefayati et al.
Summary: This study introduces a mesoscopic method based on the lattice Boltzmann method for investigating the behavior of non-Newtonian fluids in porous media. By modeling power-law fluids in different REV models of porous media, a general mesoscopic model for both two- and three-dimensional cases was developed, and successfully used to simulate natural convection and double-diffusive natural convection in porous media.
Article
Computer Science, Interdisciplinary Applications
Xiang Zhao et al.
Summary: In this study, the original boundary condition-enforced immersed boundary method is improved with the use of conjugate gradient technique and explicit technique for simulating incompressible flows with moving boundaries. The computational efficiency of the improved IBM is demonstrated to be higher than other popular IBM methods, especially the explicit technique-based IBM with a linear computational complexity. Coupled with D1Q4 lattice Boltzmann flux solver, the IBM with conjugate gradient technique and explicit technique successfully simulate two-dimensional and three-dimensional flows with second order accuracy in space.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Mechanics
C. Teruna et al.
Summary: Lattice Boltzmann simulations were used to investigate the noise mitigation mechanisms of a 3-D printed porous trailing-edge insert, revealing that the porous insert achieves substantial noise reduction at low frequencies but may lead to a slight increase at high frequencies. The segment near the tip of the insert plays a dominant role in promoting noise mitigation.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Ravi Chaithanya Mysa et al.
Summary: This study investigates the forces generated by a batoid-inspired undulating circular planform through numerical simulations, revealing that circulation has a greater impact compared to added mass effects on force generation, with the importance of edge vortices being explored in detail.
Article
Chemistry, Multidisciplinary
Tayyaba Bano et al.
APPLIED SCIENCES-BASEL
(2020)
Article
Thermodynamics
Wenxing Hao et al.
Article
Mechanics
Jiakun Han et al.
Article
Engineering, Multidisciplinary
Mihary R. Ito et al.
BIOINSPIRATION & BIOMIMETICS
(2019)
Article
Mechanics
Zhe Fang et al.
Article
Computer Science, Interdisciplinary Applications
Wenxing Hao et al.
COMPUTERS & FLUIDS
(2019)
Article
Engineering, Multidisciplinary
Longjun Wang et al.
BIOINSPIRATION & BIOMIMETICS
(2019)
Article
Mechanics
Jiakun Han et al.
Article
Mathematics, Applied
E. J. Falagkaris et al.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2017)
Article
Computer Science, Interdisciplinary Applications
D. Lagrava et al.
JOURNAL OF COMPUTATIONAL PHYSICS
(2012)
Article
Biology
Anna C. Carruthers et al.
JOURNAL OF EXPERIMENTAL BIOLOGY
(2007)
Article
Physics, Fluids & Plasmas
ZL Guo et al.
Article
Engineering, Aerospace
G Bramesfeld et al.
JOURNAL OF AIRCRAFT
(2002)
