Results 31 to 40 of about 1,669 (212)

Numerical and experimental investigations on drag-reducing effects of riblets

Engineering Applications of Computational Fluid Mechanics, 2021
The numerical simulation and force measurement experiment are conducted in this work. The direct numerical simulation method with high-order schemes is performed to resolve the incompressible turbulent flow over riblets.
Chaoqun Li, Shuo Tang, Yi Li, Zihai Geng
doaj   +1 more source

Reorganisation of turbulence by large and spanwise-varying riblets

, 2022
We study the flow above non-optimal riblets, specifically large drag-increasing and two-scale trapezoidal riblets. In order to reach large Reynolds numbers and large scale separation while retaining access to flow details, we employ a combination of ...
Newton, R. (author), Hutchins, N. (author), Newton, R., Hutchins, N, Modesti, D. (author), García-Mayoral, R. (author), Modesti, D., Endrikat, S. (author), Chung, D. (author), García-Mayoral, R., Modesti, D, Chung, D., Endrikat, S, Hutchins, N., Endrikat, S., Newton, R, Chung, D, García-Mayoral, R   +17 more
core   +1 more source

Direct numerical simulation for modification of sinusoidal riblets

Journal of Fluid Science and Technology, 2016
This paper proposes a new riblet configuration. A traditional sinusoidal riblet was modified with the aim of reducing pressure drag. The height of the side wall in the newly configured riblet is lowered toward the node of the sinusoidal curve to reduce ...
Kie OKABAYASHI
doaj   +1 more source

Controllable deformation based self‐adaptive drag reduction for complex surface

Biosurface and Biotribology, 2023
Reduction of energy consumption and improvement of cruising speed are greatly necessary for underwater vehicles. Previously, regular riblets have been machined and the drag reduction has been verified; however, the riblet parameters are not adjusted like
Dengke Chen, Xianxian Cui, Huawei Chen
doaj   +1 more source

A DNS code to evaluate drag reduction with sinusoidal riblets

, 2022
LAUREA MAGISTRALELe riblets sono uno strumento già ampiamente utilizzato in applicazioni industriali per ridurre l'attrito a parete diminuendo lo scambio di quantità di moto nella direzione del flusso.
CAVALLAZZI, GIORGIO MARIA
core  

Additive Manufacturing of Organic Electrochemical Transistors: Methods, Device Architectures, and Emerging Applications. [PDF]

Small
Organic electrochemical transistors (OECTs) are essential for bioelectronics, neuromorphics, and flexible electronics. This review examines additive manufacturing advances for OECTs, covering printing techniques, device architectures, and applications including biochemical sensing, neuromorphic, green bio‐electronics, self‐healable, and 4D electronics.
Granelli R, Kovács-Vajna ZM, Torricelli F.   +2 more
europepmc   +2 more sources

Acute‐Phase Interventions After Self‐Harm for Preventing Suicide and Recurrence: A Systematic Review and Meta‐Analysis

Acta Psychiatrica Scandinavica, Volume 153, Issue 6, Page 610-626, June 2026.
ABSTRACT Introduction Suicide risk is markedly elevated following presentation after self‐harm, yet the evidence base for interventions initiated in the immediate post‐presentation period has not been synthesized with specific attention to this high‐risk window. Clarifying which early interventions may reduce adverse outcomes is essential for informing
Guilherme Pimenta Roncete, Luis C. Farhat, Loren Beiram, Bianca Besteti Fernandes Damiano, Craig J. Bryan, Karina L. Ramirez, Euripedes Constantino Miguel, Rodolfo Furlan Damiano   +7 more
wiley   +1 more source

An investigation on design and analysis of micro-structured surfaces with application to friction reduction [PDF]

, 2014
This thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel UniversityDrag reduction in wall-bounded flows can be achieved by the passive flow control technique using riblets and surface grooves aligned in the mean direction ...
Sayad Saravi, Samira
core  

Experimental investigations on the drag reduction over riblets in a turbulent boundary layer under adverse pressure gradients

Nihon Kikai Gakkai ronbunshu
Experimental investigations on the drag reduction phenomenon over riblets have been made in turbulent boundary layer under adverse pressure gradients.
Takuto NONOMIYA, Monami SASAMORI, Shinsuke MOCHIZUKI   +2 more
doaj   +1 more source

Influence of Wall Deformation Structure on the Liquid Film Flow Behavior Under Turbulent Conditions

Asia-Pacific Journal of Chemical Engineering, Volume 21, Issue 3, May/June 2026.
ABSTRACT To explore the influence of typical wall deformation structure in the scrubbing‐cooling tube on the liquid film, this paper studied the liquid film flow behavior on the riblet walls with representative riblet radii and compared them with the flat wall. Under different liquid film Reynolds numbers (Rel = 8.3 × 103 ~ 3.14 × 104), the liquid film
Qian Liu, Yifei Wang, Jie Zeng, Zongren Pan, Dawei Feng, Guangsuo Yu   +5 more
wiley   +1 more source