Bio-Inspired Propulsion and Fluid Mechanics

A special issue of Biomimetics (ISSN 2313-7673).

Deadline for manuscript submissions: 30 August 2025 | Viewed by 709

Special Issue Editors


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Guest Editor
Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
Interests: fluid mechanics; biofluids; soft matter
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Interests: insect flight; aerodynamics; bio-fluid dynamics; computational fluid mechanics

Special Issue Information

Dear Colleagues,

Bionic air/underwater vehicles are often designed with natural flying/swimming organisms in mind, and biomimicry has emerged as an innovative approach to designing efficient machines for a number of engineering applications. In nature, fish perform rapid propulsion by oscillating their fins, and birds and insects achieve skillful flight maneuvers by flapping their wings. This is closely related to the interaction between their wings/fins and the surrounding fluids; therefore, the design of bionic vehicles requires a thorough understanding of these bio-inspired fluid flows. In the last two decades, although the flow physics underlying biopropulsion has been extensively studied, significant opportunities for further exploration remain, such as wing/fin deformation, biological self-propulsive motions, fluid–structure interactions, and wing/fin–wake interactions. Understanding these flow mechanisms is essential in designing enhanced high-performance bionic propulsion vehicles. These vehicles should be lightweight, high-performance, and adaptable to various environments. In recent years, the rapid development of artificial intelligence has provided solutions in relation to the optimal design and control design of bionic vehicles. Therefore, it is vital that we expand these innovative areas of research and propose novel methods and useful design tools.

This Special Issue aims to explore the flow physics of bionic propulsion and the design and optimization of bionic vehicles. We believe that this initiative will provide important insights into bionic propulsion and inspire contributions from leading experts in the field.

Dr. Alexander Alexeev
Dr. Xue Guang Meng
Guest Editors

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Keywords

  • flying/swimming
  • unsteady aerodynamics/hydrodynamics
  • numerical simulation/experimental techniques for bionic flows
  • self-propelled motion
  • vortex dynamics
  • bionic vehicle design and optimization

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Published Papers (1 paper)

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Research

21 pages, 7482 KiB  
Article
Numerical Analysis of the Aerodynamic Interactions in Tandem Flying Snake Airfoils
by Yuchen Gong, Jiacheng Guo, Alexander He, Ye Sun and Haibo Dong
Biomimetics 2025, 10(3), 174; https://doi.org/10.3390/biomimetics10030174 - 12 Mar 2025
Viewed by 457
Abstract
During gliding, flying snakes flatten their ribs to create an airfoil-like cross-section and adopt S-shape postures, allowing upstream body segments to generate wake structures that affect the aerodynamic performance of downstream segments. This study investigates these interactions using numerical simulations of two-dimensional snake [...] Read more.
During gliding, flying snakes flatten their ribs to create an airfoil-like cross-section and adopt S-shape postures, allowing upstream body segments to generate wake structures that affect the aerodynamic performance of downstream segments. This study investigates these interactions using numerical simulations of two-dimensional snake cross-sectional airfoils. By employing an immersed-boundary-method-based incompressible flow solver with tree topological local mesh refinement, various foil positions and movements were analyzed. The results show that aligning the downstream foil with the upstream foil reduces lift production by 86.5% and drag by 96.3%, leading to a 3.77-fold increase in the lift-to-drag ratio compared to a single airfoil. This improvement is attributed to the vortex–wedge interaction between the upstream vortex and the following foil’s leading edge (wedge), which enhances the gliding efficiency of the posterior body. Furthermore, integrating specific pitching motions with coordinated vortex shedding could further optimize its lift production. These findings provide valuable insights into the aerodynamics of tandem flying snake airfoils, offering guidance for configuring optimal body postures for improving gliding efficiency. Full article
(This article belongs to the Special Issue Bio-Inspired Propulsion and Fluid Mechanics)
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