Results 41 to 50 of about 19,973 (257)

Some consequences of non-local-equilibrium in hypersonic aerodynamic flows [PDF]

, 2005
In simulating high-speed, high-altitude aerodynamics it is important to be able to capture physical phenomena that are due to the non-local-equilibrium nature of the rarefied gas flow (this is in addition to any effects due to dissociation, ionisation ...
Greenshields, Christopher, Reese, Jason
core  

Sol–Gel Derived Polymer Precursors for Stereolithography of ZrC

Advanced Engineering Materials, EarlyView.
ZrC is a critical material target for extreme temperature conditions. This report describes a protocol for preparing ZrC ceramics via stereolithography and examines the impact of the polymer matrix on carbothermal reduction and mechanical stability of 3D printed ZrC.
Charles J. Rafalko, Evelyn Wang, Michael A. Hickner   +2 more
wiley   +1 more source

Longitudinal and transversal flow over a cavity containing a second immiscible fluid

, 2012
An analytical solution for the flow field of a shear flow over a rectangular cavity containing a second immiscible fluid is derived. While flow of a single-phase fluid over a cavity is a standard case investigated in fluid dynamics, flow over a cavity ...
Cherepanov, Clarissa Schönecker, Karniadakis, Keldysh, Lauga, Lawrentjew, Muskhelishvili, Muskhelishvili, Navier, Nosonovsky, Smirnow, Sotkilava, Steffen Hardt   +12 more
core   +1 more source

LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers [PDF]

, 2017
This paper investigates the effects of surface roughness on the flow past a circular cylinder at subcritical to transcritical Reynolds numbers. Large eddy simulations of the flow for sand grain roughness of size k/D = 0.02 are performed (D is the ...
A Ekmekci, A Leonard, A Roshko, A Scotti, AA Townsend, Assensi Oliva, B Cantwell, C Norberg, CHK Williamson, D Aljure, E Achenbach, E Achenbach, E Szechenyi, F Nicoud, FX Trias, FX Trias, G Buresti, G Schewe, G West, H Mansy, H Schlichting, I Rodríguez, Ivette Rodriguez, J Jimenez, J Yuan, J Yuan, J Yuan, JLD Ribeiro, JLD Ribeiro, Jorge Chiva, JP Batham, JS Humphreys, KA Flack, L Jofre, MR Raupach, O Güven, O Lehmkuhl, O Lehmkuhl, Oriol Lehmkuhl, PW Bearman, R Borrell, R Borrell, R Dutta, Ricard Borrell, S Dong, S Rajagopalan, S Yarusevych, SB Pope, SJ Lee, SJ Quintavalla, T Adachi, U Ünal, Ugo Piomelli, W Shih, W Yeung, X Ma, Y Nakamura   +56 more
core   +5 more sources

Influence of an Oxygen‐Free Atmosphere on Diamond‐Single‐Grain Scratching of Ti–6Al–4V

Advanced Engineering Materials, EarlyView.
Single‐grain scratching of Ti–6Al–4V is investigated under controlled, oxygen‐free, and ambient atmospheres using a novel experimental setup with in situ high‐speed imaging. The approach enables direct observation of chip formation and adhesion under suppressed oxidation.
Berend Denkena, Benjamin Bergmann, Michael Zenger   +2 more
wiley   +1 more source

Experimental Aerodynamics of a Small Fixed-Wing Unmanned Aerial Vehicle Coated with Bio-Inspired Microfibers Under Static and Dynamic Stall

Aerospace
A passive flow control technique in the form of microfiber coatings with a diverging pillar cross-section area was applied to the wing suction surface of a small tailless unmanned aerial vehicle (UAV). The coatings are inspired from ‘gecko feet’ surfaces,
Dioser Santos, Guilherme D. Fernandes, Ali Doosttalab, Victor Maldonado   +3 more
doaj   +1 more source

State of the Art in the Optimisation of Wind Turbine Performance Using CFD [PDF]

, 2019
Wind energy has received increasing attention in recent years due to its sustainability and geographically wide availability. The efficiency of wind energy utilisation highly depends on the performance of wind turbines, which convert the kinetic energy ...
Haghnegahdar, Mohammad Amin, Kolios, Athanasios, Lander, Martin, Mussetta, Marco, Shourangiz-Haghighi, Alireza, Wang, Lin   +5 more
core   +1 more source

Rafting of Ni‐Based Superalloys Under Multiaxial Load as Understood by Phase‐Field Simulations and Critical Experiments

Advanced Engineering Materials, EarlyView.
Phase‐field simulations coupled with dislocation‐density‐based crystal plasticity modeling reproduce γ′ rafting behavior in single‐crystal Ni‐based superalloys under varied loading conditions. The model captures both macroscopic creep and microscopic morphology evolution, with results matching high‐temperature creep experiments.
Micheal Younan, David Bürger, Gunther Eggeler, Oleg Shchyglo, Ingo Steinbach, Muhammad Adil Ali   +5 more
wiley   +1 more source

Phase Field Failure Modeling: Brittle‐Ductile Dual‐Phase Microstructures under Compressive Loading

Advanced Engineering Materials, EarlyView.
The approach by Amor and the approach by Miehe and Zhang for asymmetric damage behavior in the phase field method for fracture are compared regarding their fitness for microcrack‐based failure modeling. The comparison is performed for the case of a dual‐phase microstructure with a brittle and a ductile constituent.
Jakob Huber, Jan Torgersen, Ewald Werner
wiley   +1 more source

A Review and Prototype Proposal for a 3 m Hybrid Wind–PV Rotor with Flat Blades and a Peripheral Ring

Applied Sciences
This paper presents a literature review of low-power hybrid wind–photovoltaic (PV) systems and introduces a 3 m diameter prototype rotor featuring twelve PV-coated pivoting blades stiffened by a peripheral rim.
George Daniel Chiriță, Viviana Filip, Alexis Daniel Negrea, Dragoș Vladimir Tătaru   +3 more
doaj   +1 more source