Results 71 to 80 of about 1,279 (239)

Turbulence‐Intensity Effects on the Aerodynamic Performance of an H‐Type Darrieus Wind Turbine: A URANS Parametric Study

Energy Science &Engineering, EarlyView.
Turbulence intensity from 1% to 25% was parametrically tested on a three‐bladed H‐type Darrieus rotor across five tip speed ratios (TSRs) using two‐dimensional URANS. The optimal TSR proved the most efficient and most robust operating point simultaneously, with Cp losses capped at 5.8% even at TI = 25%. ABSTRACT The effect of inlet turbulence intensity
Aydin Ulus
wiley   +1 more source

Study on Fluid Pressure in Tubing, Dynamic Stress in Reservoir, and Fracture Propagation Morphology During Variable‐Rate Hydraulic Fracturing

Energy Science &Engineering, EarlyView.
Variable‐rate hydraulic fracturing can induce unsteady flow in the tubing, thereby generating fluctuating fluid pressure near the bottom‐hole reservoir. Dynamic stress is generated in the reservoir under the action of fluctuating fluid pressure and propagates as stress waves.
Zhu Ge, Wang Chaojing, Li Weicheng
wiley   +1 more source

Study on aerodynamic characteristics of tilting wing unmanned aerial vehicle in transition state

Hangkong gongcheng jinzhan
In response to the problem of the continuous tilting transition process of the configuration of unmanned aerial vehicle with complex and unsteady aerodynamic characteristics, the real blade is replaced with a virtual propeller disk model, the rotor flow ...
MA Kai, LIN Changliang, PAN Minglong, WANG Xiong, LU Yang   +4 more
doaj   +1 more source

Convergence and Residual Error Analysis of Unsteady MHD Stagnation Flow Over a Cylindrical Surface With Streamline and Isotherm Visualization

Energy Science &Engineering, EarlyView.
The novelty of the current study is that the unsteady MHD Cross nanofluid model is, for the first time, coupled with the melting heat transfer at the stagnation point over a horizontally extended cylinder in a Darcy–Forchheimer porous medium. This work connects complex rheological behaviors and phase‐change phenomena in a unique way, with the only ...
Fahad Maqbul Alamrani, Ebrahem A. Algehyne, Mounirah Areshi, Muhammad Bilal, Mustafa Bayram, Jihad Younis, Anwar Saeed   +6 more
wiley   +1 more source

Spacing Effects in Guided Vertical‐Axis Wind Turbine Arrays for Highway Energy Harvesting Under Multi‐Vehicle Wake Conditions

Energy Science &Engineering, EarlyView.
Three‐turbine guided Savonius arrays installed along highway corridors extract up to 697 J under multi‐vehicle wake conditions when spaced 12 rotor diameters apart—68% more than compact arrangements. Guide vanes boost output by 80–120%, and interior turbines respond most strongly to spacing, governing overall array performance. ABSTRACT Highway‐induced
Aydin Ulus, Stefan Ilie Moldovan
wiley   +1 more source

Probiotic Spore Inspired Oral Drug Delivery System With Multiple‐Barriers‐Crossing Ability Modulates Gut‐Brain Axis for Parkinson's Disease Therapy

Exploration, EarlyView.
Inspired by the germination of probiotic spores, we utilize the excellent characteristics of spores to break through multiple barriers of oral brain‐targeted delivery. Besides the probiotics mediated gut‐brain communication, the spore coat proteins derived nanosystems with multiple‐barriers‐crossing ability alleviate neurodegeneration.
Qianhua Feng, Yuying Mei, Jia Zhang, Liying Sun, Bingqian Si, Huimin Zhou, Huifang Xiao, Runhan Liu, Jieyun Zhang, Lei Wang   +9 more
wiley   +1 more source

A Comparison of the Quasi-Steady Assumption with Unsteady Effects on Tower Galloping Analysis

Buildings
Traditional tower galloping theory is founded on the quasi-steady assumption, which has inherent limitations. By treating tower galloping as a single-degree-of-freedom crosswind bending flutter problem and introducing flutter derivatives into the ...
Zihang Yang, Yangzhao Liu, Ying Chang, Kaoshan Dai   +3 more
doaj   +1 more source

Immersed Boundary Projection Method for Boundaries With Slip Velocities

International Journal for Numerical Methods in Fluids, EarlyView.
A formulation of the immersed boundary method for incompressible flow over arbitrarily‐shaped bodies with surface slip described by the Navier boundary condition is presented. The wall slip velocity and the boundary force are determined implicitly through a projection to satisfy both the boundary condition and the divergence‐free condition of the ...
Takehiro Fujii, Takeshi Omori
wiley   +1 more source

On the Variability of Results for Cylinder Flow: A Systematic Analysis of Parameter Sensitivity Within the Lattice Boltzmann Method

International Journal for Numerical Methods in Fluids, EarlyView.
This study systematically investigates the variability of cylinder flow results. We provide a comprehensive overview of literature values and, using the lattice Boltzmann method (LBM), show that insufficient convergence studies and variations in simulation parameters are a plausible cause for the significant spread in data.
Maximilian Bille, Mario C. Bedrunka, Philipp Spelten, Holger Foysi, Dirk Reith   +4 more
wiley   +1 more source

Aerodynamic Performance of a Baja SAE Vehicle Using Hybrid RANS-LES Approach [version 3; peer review: 2 approved, 1 not approved]

F1000Research
This study presents a high-fidelity computational investigation of the aerodynamic performance of a Baja SAE off-road vehicle using a hybrid Reynolds-Averaged Navier–Stokes (RANS) and Large Eddy Simulation (LES) turbulence modeling approach.
Sergio A. Ardila Gomez, Jessica G. Maradey Lazaro, Jhon J. Quiñones, Deisy Y. Rodriguez Sarmiento   +3 more
doaj   +1 more source