Results 71 to 80 of about 22,502 (309)

On the Stability and Transition to Turbulence of the Flow over a Wind-Turbine Airfoil under Varying Free-Stream Turbulence Intensity

, 2022
The present work investigates the laminar-turbulent transition of the flow around a typical section of a wind turbine blade under different levels of isotropic inflow turbulence at a Reynolds number of Rec = 105.
Henningson, Dan S.,, Lobo, Brandon A.,, Schaffarczyk, Alois P.,, Coelho Leite Fava, Thales,, Breuer, Michael,, Hanifi, Ardeshir,   +5 more
core   +2 more sources

Recent advances in plasma control and physics research in the Large Helical Device

Nuclear Fusion
The Large Helical Device (LHD), the largest superconducting helical system in the world, is equipped with advanced heating and diagnostic tools, facilitating plasma control and physics research.
K. Tanaka, K. Ida, Y. Morishita, H. Ohtani, D. Medina Roque, T. Tokuzawa, N. Kenmochi, T. Kinoshita, K. Toi, S. Murakami, H. Funaba, R. Ichikawa, M. Yokoyama, G. Ueno, K. Ogawa, N. Ohno, A. Kageyama, K.J. McCarthy, I. García-Cortés, N. Tamura, F. Nespoli, R. Lunsford, M. Shohji, S. Masuzaki, C. Suzuki, A. Mollen, M. Yoshinuma, M. Goto, Y. Kawamoto, T. Kawate, I. Yamada, T. Nasu, T. Kobayashi, K. Itoh, Y. Mizuno, R. Yasuhara, H. Uehara, D.J. DenHartog, Y. Takemura, H. Igami, R. Yanai, T. Takeuchi, T. Yokoyama, O. Osakabe, S. Morita, A. Shimizu, M. Nishiura, N. Pablant, D.A. Spong, H. Nuga, K. Nagaoka, Y. Katoh, R. Sakamoto, H. Yamada, LHD Experiment Group   +54 more
doaj   +1 more source

Collision‐Resilient Winged Drones Enabled by Tensegrity Structures

Advanced Robotics Research, EarlyView.
Based on structures of birds such as the woodpeck, this article presents the collision‐resilient aerial robot, SWIFT. SWIFT leverages tensegrity structures in the fuselage and wings which allow it to undergo large deformations in a crash, without sustaining damage. Experiments show that SWIFT can reduce impact forces by 70% over conventional structures.
Omar Aloui, Raphael Zufferey, William Stewart, Mohammad Askari, Simon Jeger, Dario Floreano   +5 more
wiley   +1 more source

Modelling the Transition from Shear-Driven Turbulence to Convective Turbulence in a Vertical Heated Pipe

Mathematics
Heated pipe flow is widely used in thermal engineering applications, but the presence of buoyancy force can cause intermittency, or multiple flow states at the same parameter values.
Shijun Chu, Elena Marensi, Ashley P. Willis   +2 more
doaj   +1 more source

Transition in hypersonic boundary layers

AIP Advances, 2015
Transition and turbulence production in a hypersonic boundary layer is investigated in a Mach 6 wind tunnel using Rayleigh-scattering visualization, fast-response pressure measurements, and particle image velocimetry.
Chuanhong Zhang, Yiding Zhu, Xi Chen, Huijing Yuan, Jiezhi Wu, Shiyi Chen, Cunbiao Lee, Mohamed Gad-el-Hak   +7 more
doaj   +1 more source

Highly optimized transitions to turbulence [PDF]

Proceedings of the 41st IEEE Conference on Decision and Control, 2002., 2004
We study the Navier-Stokes equations in three dimensional plane Couette flow geometry subject to stream-wise constant initial conditions and perturbations. The resulting two dimensional/three component (2D/3C) model has no bifurcations and is globally (non-linearly) stable for all Reynolds numbers R, yet has a total transient energy amplification that ...
Bobba, K. M., Bamieh, B., Doyle, J. C.
openaire   +2 more sources

From Lab to Landscape: Environmental Biohybrid Robotics for Ecological Futures

Advanced Robotics Research, EarlyView.
This Perspective explores environmental biohybrid robotics, integrating living tissues, microorganisms, and insects for operation in real‐world ecosystems. It traces the leap from laboratory experiments to forests, wetlands, and urban environments and discusses key challenges, development pathways, and opportunities for ecological monitoring and ...
Miriam Filippi
wiley   +1 more source

Intelligent Sky Guardians (InSkyGuard): An Aerial Robotic Swarm for Autonomous Detection and Entrapment of Rogue Multirotors

Advanced Robotics Research, EarlyView.
Intelligent Sky Guardians (InSkyGuard) is introduced as a four‐drone swarm that autonomously detects, tracks, and safely captures rogue drones using a coordinated net system. Computer vision and leader–follower control architecture enable synchronized enclosure, while integrated failsafes enhance system reliability. Validated through closed‐environment
Joshua Hastings, Levanya Dewanarayana, Iline Shaju, Haider Al‐Wizni, Sampson Marquis, Weicheng Huang, Pooya Sareh   +6 more
wiley   +1 more source

Laminar Pipe Flow Instability: A Theoretical-Experimental Perspective

Fluids
This paper revisits the theoretically predicted inherent stability of fully developed laminar pipe flow, which remains unconfirmed by experimental evidence.
Franz Durst, El-Sayed Zanoun
doaj   +1 more source

Optimization of Magnetic Milli‐Spinner for Robotic Endovascular Intervention

Advanced Robotics Research, EarlyView.
This work presents the design optimization of a multifunctional magnetic milli‐spinner for high‐speed propulsion and efficient clot debulking. The optimized design achieves an ultrafast swimming velocity of 55 cm/s (≈175 body lengths/s) in saline water, enabling stable upstream swimming against strong physiological flows and establishing magnetic milli‐
Lu Lu, Luca Higgins, Jack Bernardo, Ruike Renee Zhao   +3 more
wiley   +1 more source