Results 21 to 30 of about 481,059 (233)

Three-Bladed Horizontal Axis Water Turbine Simulations with Free Surface Effects

open access: yesInternational Journal of Applied Mechanics and Engineering, 2021
The water level above a hydrokinetic turbine is likely to vary throughout the season and even along the day. In this work, the influence of the free surface on the performance of a three bladed horizontal-axis turbine is explored by means of a three ...
L. Rodríguez   +2 more
doaj   +1 more source

Study on the influence of dynamic/static interface processing methods on CFD simulation results of the axial-flow blood pump

open access: yesAdvances in Mechanical Engineering, 2020
Computational fluid dynamics is an essential tool for the flow field analysis of the blood pump. The interface processing method between the dynamic/static regions will affect the accuracy of simulation results, but its influence on the simulation ...
Shuai Wang, Jianping Tan, Zheqin Yu
doaj   +1 more source

Numerical Prediction of Unsteady Aerodynamics of a Ducted Fan Unmanned Aerial Vehicle in Hovering

open access: yesAerospace, 2022
Recently, ducted fan unmanned aerial vehicles (UAVs) have attracted considerable attention due to their potential for application in both civil and military missions.
Hongming Cai   +2 more
doaj   +1 more source

Low Reynolds Number Propeller Slipstream Interference with Wing Aerodynamic Characteristics

open access: yesHangkong gongcheng jinzhan, 2018
Detailed research for wing aerodynamic characteristics of propeller slipstream at low Reynolds number could contribute the mechanism study of low speed near space flow, and provide reliable aerodynamic results.
Sun Kaijun, Bao Xiaoxiang, Fu Yiwei
doaj   +1 more source

Ground Test and Numerical Simulation on Ground Effect of Ducted Propeller System

open access: yesXibei Gongye Daxue Xuebao, 2020
The aerodynamic performances of a ducted propeller system applied in a manned vertical takeoff and landing aircraft considering the ground effect are investigated.

doaj   +1 more source

Paper: Pointing height marks target distance among the San Juan Quiahije Chatino

open access: yes, 2021
Archived here is a PDF of the research publication, Mesh, Kate (2021). It's as far as the arm can raise: Pointing height marks target distance among the San Juan Quiahije Chatino. Lingua: 259.
Mesh, Kathryn
core   +1 more source

Sliding Mode Control for Slosh-Free Motion using a Nonlinear Sliding Surface [PDF]

open access: yes, 2013
A new nonlinear switching surface is proposed for the design of a sliding mode controller for a class of mismatched uncertain systems. A control system for slosh-free motion of a partially filled liquid container is sought.
GANDHI, PS   +9 more
core   +1 more source

Could Mesh Placement Solve the Problem of High Radiological and Symptomatic Recurrence in Patients with a Large Sliding Hiatal Hernia? A Prospective Comparative Study [PDF]

open access: yesAin-Shams Journal of Surgery
Introduction: Large sliding Hiatal Hernia (HH) is associated with an exceedingly high incidence of recurrenceafter surgery. An ongoing controversy exists while managing it regarding the best surgical technique.
Tarek Osman, Ahmed Shoka, Ramy Fouad
doaj   +1 more source

On Sliding Mode Observers for Systems with Unknown Inputs [PDF]

open access: yes, 2007
International audienceThis paper considers the problem of designing an observer for a linear system subject to unknown inputs. This problem has been extensively studied in the literature with respect to both linear and nonlinear (sliding mode) observers.
Floquet, Thierry   +8 more
core   +1 more source

Numerical Analysis on Self-Propulsion of a Waterjet-Propelled Ship with Different Propulsion Models

open access: yesApplied Sciences, 2022
The hydrodynamics of the waterjet-propelled ship is a challenging issue due to the sophistication of waterjet system geometry as well as waterjet–hull interaction. In current study, three different propulsion models, namely, multiple reference frame (MRF)
Yong Zhang, Zhong Li, Aiming Yang
doaj   +1 more source

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