Results 31 to 40 of about 19,450 (267)

Numerical Simulation on Drag Reduction for Flow Past Two Tandem Cylinders with Reinforcement Learning

气体物理
Drag reduction for flows over blunt bodies has always been a hot topic of research in aerospace and other fields, which is very important to improve aircraft performance and reduce energy consumption.
Qiujing HU, Yan WANG
doaj   +1 more source

Modeling Dislocation Cutting of γ′ Precipitates in Ni‐Base Superalloys: Linking Atomistic and Dislocation Dynamics Simulations

Advanced Engineering Materials, EarlyView.
Dislocation cutting of γ′ precipitates in Ni‐based superalloys is investigated by linking atomistic simulations with discrete dislocation dynamics. The critical cutting stress is shown to be governed by the antiphase boundary energy, while line tension effects promote edge‐preferred cutting.
Frédéric Houllé, Siwen Gao, Marc Fivel, Anxin Ma, Daria Smirnova, Sriram Anand, Arun Prakash, Julien Guénolé, Alexander Hartmaier, Erik Bitzek   +9 more
wiley   +1 more source

Turbulators and Coefficient of Drag [PDF]

International Scholastic Journal of Science
Turbulators have been shown to reduce the drag force on an object moving through a fluid. The relationship between the number of turbulators and the coefficient of drag of a sphere moving through water is investigated here.
Piyasak Chantabhakdi, Kurit Muangsiri, Imsook Poonvasin, Daniel Vitayatanagorn   +3 more
doaj  

Numerical calculation of boundary layers and wake characteristics of high-speed trains with different lengths. [PDF]

PLoS ONE, 2017
Trains with different numbers of cars running in the open air were simulated using the delayed detached-eddy simulation (DDES). The numbers of cars included in the simulation are 3, 4, 5 and 8.
Lirong Jia, Dan Zhou, Jiqiang Niu
doaj   +1 more source

Machine Learning‐Supported Analysis for Predicting and Visualizing Nonlinear Relationships Between Material Properties in Electroplated Chromium Layers

Advanced Engineering Materials, EarlyView.
This study applies machine learning regression to predict chromium layer thickness in decorative trivalent chromium electroplating, using 441 experiments from laboratory‐scale (1L) and pilot‐scale (14L) setups. Tree‐based models, particularly CatBoost, outperformed linear regression by capturing nonlinear parameter interactions (R2$R^2$ up to 0.77 ...
Christoph Baumer, Christopher Mai, Luca Eisentraut, Andreas Bund, Ricardo Buettner   +4 more
wiley   +1 more source

Calculation and uncertainty analysis method for airfoil drag coefficient considering compressibility

AIP Advances
In order to meet the need of evaluating the effectiveness of airfoil drag reduction design, the calculation and uncertainty analysis method for airfoil drag coefficient considering compressibility is studied.
Yufeng Du, Qiuting Guo, Lulu Wang, Jilong Zhu, Neng Xiong   +4 more
doaj   +1 more source

Drag Coefficients of Golf Balls

World Journal of Mechanics, 2018
Drag across a golf ball can affect distance traveled when hitting a ball. An average golf ball will have a drag coefficient of, 0.24 35 m/s. This research found that a significantly deeper dimple pattern will greatly affect the boundary layer, thus changing the drag coefficient and boundary layer.
Peter E. Jenkins, Joseph Arellano, Mark Ross, Matthew Snell   +3 more
openaire   +2 more sources

On the Effect of Creep on Local Lattice Orientation in Single‐Crystal Ni‐Based Superalloy Microstructures

Advanced Engineering Materials, EarlyView.
During creep of a single‐crystal Ni‐based superalloy, the overall crystal orientation is observed to remain constant while the microstructure evolves. Despite the lack of macroscopic rotation, small (<1°) rotations are observed on the submicron size scale and are accommodated by counteracting rotations over the scale of several micrometers.
E. J. Payton, E. B. Dursun, G. Eggeler, L. Agudo Jácome   +3 more
wiley   +1 more source

A Comparison of Experimental and Analytical Procedures to Measure Passive Drag in Human Swimming. [PDF]

PLoS ONE, 2015
The aim of this study was to compare the swimming hydrodynamics assessed with experimental and analytical procedures, as well as, to learn about the relative contributions of the friction drag and pressure drag to total passive drag. Sixty young talented
Tiago M Barbosa, Jorge E Morais, Pedro Forte, Henrique Neiva, Nuno D Garrido, Daniel A Marinho   +5 more
doaj   +1 more source

Evaluation drag coefficients for circular patch vegetation with different riverbed roughness

Cogent Engineering, 2022
The drag coefficient of a one-line circular patch of emergent sparse vegetation in an open-channel flow or riverbeds with varying bed roughness sizes was experimentally investigated.
Karim R. Gubashi, Saad Mulahasan, Mohammed Abid Jameel, Abdul-Sahib T. Al-Madhhachi   +3 more
doaj   +1 more source