Results 31 to 40 of about 22,979 (144)

Validation of the LOGOS Software Package Methods for the Numerical Simulation of Cavitational Flows

Fluids, 2023
Verification problems and numeric simulation of cavitation processes with the help of LOGOS computational fluid dynamics software are presented in this article.
Andrey Kozelkov, Andrey Kurkin, Vadim Kurulin, Kseniya Plygunova, Olga Krutyakova   +4 more
doaj   +1 more source

Numerical study on hydrodynamic characteristics of hybrid contra-rotating propeller

Zhongguo Jianchuan Yanjiu
[Objectives] In order to study the propulsion performance of the hybrid contra-rotating propeller,[Methods] the hydrodynamic characteristics of the propeller, the podded propeller and the hybrid contra-rotating propeller(CRP) are numerically simulated by
Zeng Wang, Li Ye, Qin Jiangtao
doaj   +1 more source

Accuracy of Turbulent Closure Models in Calculation of Thrust of a Low Reynolds Number Airfoil Used as a Propeller

Metal: Jurnal Sistem Mekanik dan Termal, 2022
Unlike in the case of high Reynolds number airfoil, selecting a turbulent closure model for the low Reynolds number airfoil is still a challenge. A turbulent model used for high Reynolds number airfoil is not necessarily suitable for low Reynolds number ...
Adek Tasri
doaj   +1 more source

Propeller Open-Water Test Method for Hybrid Contra Rotating Propeller

Journal of Marine Science and Engineering
The Hybrid Contra Rotating Propeller is a developing propulsion system that combines a conventional single-shaft propeller with a POD propeller to achieve high energy-saving performance through a Contra Rotating Propeller.
Tomoki Wakabayashi, Tokihiro Katsui
doaj   +1 more source

New Orleans school meal programs during the COVID-19 pandemic: challenges and innovations identified through qualitative interviews

BMC Public Health
Background School meal programs are critical to reducing childhood food insecurity. This study identified challenges and innovations in school meal service in a disaggregated charter school system during COVID-19 in New Orleans, Louisiana.
Megan B. Knapp, Kristine Creveling, Domonique Washington, Naana Ennin, Tiffany Numa   +4 more
doaj   +1 more source

Experimental Study on Dynamic Structure of Propeller Tip Vortex

Polish Maritime Research, 2020
Propeller cavitation is a main source of fluctuating pressure and noise induced by propellers, and the tip vortex cavitation is the principal source. The present study measures the flow fields near the blade tip using the 2D-PIV technique.
Guangnian Li, Chen Qingren, Liu Yue
doaj   +1 more source

Numerical prediction of cavitation phenomena on marine vessel: Effect of the water environment profile on the propulsion performance

Open Engineering, 2022
Energy-saving and emission reduction are crucial since shipping activity due to the global maritime trade has increased exponentially. Several agreements have been engaged to optimize ship energy efficiency composed of ship design and shipping operation ...
Yusvika Muhammad, Fajri Aprianur, Tuswan Tuswan, Prabowo Aditya Rio, Hadi Syamsul, Yaningsih Indri, Muttaqie Teguh, Laksono Fajar Budi   +7 more
doaj   +1 more source

MODELING AND CALCULATION OF A GEAR CONNECTION FOR A UNIVERSAL DEVICE FOR MEASURING THE THRUST OF AN UNMANNED AERIAL VEHICLE PROPELLER

Надежность и качество сложных систем, 2022
Background. The rapid development and widespread use of various unmanned aerial vehicles requires the introduction of their typification and certification.
D.S. Ergaliev, D.V. Zuev, A.A. Kochetkov, A.V. Lysenko, N.D. Koshelev   +4 more
doaj   +1 more source

Quadcopter thrust optimization with ducted-propeller

MATEC Web of Conferences, 2017
In relation to quadcopter body frame model, propeller can be categorized into propeller with ducted and without ducted. This study present differences between those two using CFD (Computational Fluid Dynamics) method.
Kuantama Endrowednes, Tarca Radu
doaj   +1 more source

Analysis of Hydrodynamic Performance of L-Type Podded Propulsion with Oblique Flow Angle

Journal of Marine Science and Engineering, 2019
In this study, the Reynolds-averaged Navier⁻Stokes (RANS) method and a model experimental test in a towing tank are used to investigate the unsteady hydrodynamic performance of L-type podded propulsion under different oblique flow angles and ...
Wei Wang, Dagang Zhao, Chunyu Guo, Yongjie Pang   +3 more
doaj   +1 more source