16 papers · ranked by Valyu relevance
Jiasi Wei, Junjie Wu, Chen Wang, Steve Vanlanduit
Digital holography has transformative potential for the measurement of stacked-chip microstructures due to its non-invasive, single-shot, full-field characteristics. However, significant light scattering and diffraction at steep edges in step microstructures cause the batwing effect, leading to measurement errors.…
Sushrut Kumar, Jung-Hee Seo, Rajat Mittal
Dynamics in Bat Inspired Wings Authors: ['Sushrut Kumar' 'Jung-Hee Seo' 'Rajat Mittal'] We employ a novel computational modeling framework to perform high-fidelity direct numerical simulations of aero-structural interactions in bat-inspired membrane wings. The wing of a bat consists of an elastic membrane supported by…
Ziwu Guan, Yongliang Yu
The large active wing deformation is a significant way to generate high aerodynamic forces required in bat flapping flight. Besides the twisting, the elementary morphing models of a bat wing are proposed, such as wing-bending in the spanwise direction, wing-cambering in the chordwise direction, and wing area-changing.…
James D. Gardiner, Grigorios Dimitriadis, Jonathan R. Codd, Robert L. Nudds + 1 more
'Robert L. Nudds' 'Brock Fenton'] Wind tunnel tests conducted on a model based on the long-eared bat Plecotus auritus indicated that the positioning of the tail membrane (uropatagium) can significantly influence flight control. Adjusting tail position by increasing the angle of the legs ventrally relative to the body…
Sushrut Kumar, Joshua Romero, Jung-Hee Seo, Massimiliano Fatica + 1 more
Computational fluid dynamics and fluid-structure interaction simulations involving moving and deforming bodies is extremely hard. In this work, we present a graphical processing unit (GPU) optimized implementation of the sharp-interface immersed boundary method. The method allows performing simulation around complex…
Tarek Hashem, Ahmed Farahat
Background The aim of this study is to compare the results of batwing mammoplasty and Wise pattern mammoplasty in the surgical management of upper pole breast tumours. Methods This is a retrospective observational study including 126 breast cancer patients who presented between 2009 and 2015 to the National Cancer…
Hoang Vu Phan, Thi Kim Loan Au, Hoon Cheol Park
This study used numerical and experimental approaches to investigate the role played by the clap-and-fling mechanism in enhancing force generation in hovering insect-like two-winged flapping-wing micro air vehicle (FW-MAV). The flapping mechanism was designed to symmetrically flap wings at a high flapping amplitude of…
Michael Lawson, Dale Jenne, Robert Thresher, Daniel Houck + 3 more
'Jeffrey Wimsatt' 'Bethany Straw' 'Hongbing Ding'] The high rates of bat mortality caused by operating wind turbines is a concern for wind energy and wildlife stakeholders. One theory that explains the mortality is that bats are not only killed by impact trauma, but also by barotrauma that results from exposure to the…
Rowan Eveline Muir, Ignazio Maria Viola
Recent investigations on the aerodynamics of natural fliers have illuminated the significance of the Leading-Edge Vortex (LEV) for lift generation in a variety of flight conditions. A well documented example of an LEV is that generated by aircraft with highly swept, delta shaped wings. While the wing aerodynamics of a…
Iden Kurtaliaj, Jennifer Kunes, Shicheng Li, Michael Rowley + 6 more
Overhead motion in humans often leads to shoulder injuries, a consequence of the evolutionary trade-off in glenohumeral joint anatomy that balances stability with mobility. Bats consistently engage in overhead motion during flight, subjecting their shoulders to substantial loading throughout their relatively long…
Yu Teshima, Shoko Genda, Yota Aoki, Masahiro Fujisawa + 2 more
Echolocating bats routinely navigate complex wild environments with remarkable agility, yet it remains unclear whether their flight trajectories reflect reproducible internal control strategies or are merely the result of improvised reactive behavior. To address this question, we recorded flight paths and pulse…
Hui Ho Vanessa Chang, Grace Capshaw, Dimitri Skandalis, Cynthia F. Moss + 1 more
Eye movements enable visual information gathering and stabilize gaze via optokinetic (OKR) and vestibulo-ocular reflex (VOR) pathways.^1^ Echolocating bats, despite their rapid and agile flight maneuvers to land upside down and navigate 3D space, have long been thought not to move their eyes, an assumption originating…
Rahul Kumar, Srikant Sekhar Padhee, Devranjan Samanta
In this work, we have performed numerical simulations of the flapping motion of a rectangular wing in a three-dimensional flow field using the discrete vortex method (DVM). The DVM method is computationally more convenient because it does not require the generation of a grid for the flow field at each time step as in…
Csaba Hefler, Huihe Qiu, Wei Shyy
While dragonflies are highly agile flyers, some key aerodynamic mechanisms responsible for their flight performance remain inadequately understood. Based on forward flight conditions, we investigate dragonflies's spanwise aerodynamic behaviors associated with flapping wings' phasing relationship. Overall, the leading…
Siavash Toosi, Adam Peplinski, Philipp Schlatter, Ricardo Vinuesa
High-fidelity simulations are conducted to investigate the turbulent boundary layers around a finite-span NACA0012 wing with a rounded wing-tip geometry at a chord-based Reynolds number of = 200 000 and at various angles of attack up to 10◦ . The study aims to discern the differences between the boundary layers on the…
Aaron F. Pomerantz, Radwanul H. Siddique, Elizabeth I. Cash, Yuriko Kishi + 5 more
Numerous species of Lepidoptera have transparent wings, which often possess scales of altered morphology and reduced size, and the presence of membrane surface nanostructures that dramatically reduce reflection. Optical properties and anti-reflective nanostructures have been characterized for several ‘clearwing’…