Results 11 to 20 of about 37,322 (309)
Drag Reduction on a Transonic Airfoil [PDF]
Journal of Fluid Mechanics, 2022 Flow control for turbulent skin-friction drag reduction is applied to a transonic airfoil to improve its aerodynamic performance. The study is based on direct numerical simulations (with up to 1.8 billion cells) of the compressible turbulent flow around ...
Gatti, D. +17 more
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Theory of concentration dependence in drag reduction by polymers and of the maximum drag reduction asymptote [PDF]
Physical Review Letters, 2004 A simple model of the effect of polymer concentration on the amount of drag reduction in turbulence is presented, simulated, and analyzed. The qualitative phase diagram of drag coefficient versus Reynolds number (Re) is recaptured in this model ...
Ching, ESC +5 more
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Simple model for drag reduction [PDF]
Physical Review E, 2003 Direct Numerical Simulations established that the FENE-P model of viscoelastic flows exhibits the phenomenon of turbulent drag reduction which is caused in experiments by dilute polymeric additives. To gain analytic understanding of the phenomenon we introduce in this Letter a simple 1-dimensional model of the FENE-P equations.
Benzi, Roberto, Procaccia, Itamar
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Frontiers in Bioengineering and Biotechnology, 2022 Square cylinders are widely used in various fields. For example, they are common structures in fishways. The flow around square cylinders has been a common problem in various fields.
Siying Wang, Qibiao Wu, Xiaotao Shi
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Numerical Study of Combined Drag Reduction Bases on Vortex Generators and Riblets for the Ahmed Body using IDDES Methodology [PDF]
Journal of Applied Fluid Mechanics, 2022 The flow fields around vehicle drag reduction devices are three-dimensional, complicated, and unsteady. Meanwhile, the small scale of the drag reduction device brings more challenges to the simulation. An Improved Delayed Detached Eddy Simulation (IDDES)
X. Yang, Y. Hu, Z. Gong, J. Jian, Z. Liu
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Drag reduction by compressible bubbles [PDF]
Physical Review E, 2006 Drag reduction by bubbles in stationary turbulent flows is sensitive to the compressibility of the bubbles. Without this dynamical effect the bubbles only renormalize the fluid density and viscosity, an effect that by itself can only lead to a small percentage of drag reduction. We show in this paper that the dynamics of bubbles and their effect on the
T S, Lo +2 more
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Study on Cruise Drag Characteristics of Low Drag Normal Layout Civil Aircraft
Xibei Gongye Daxue Xuebao, 2020 This paper focus on the wing shape related drag reduction measures of normal layout civil aircraft, through the drag reduction to improve the aircraft performance.
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Current state and prospects on applications of ship drag reduction using air lubrication
Zhongguo Jianchuan Yanjiu, 2023 With the implementation of new carbon reduction rules for international shipping, as well as the domestic "peak carbon and carbon neutrality" strategy, the innovative air lubrication drag reduction technology for ship energy-saving and carbon reduction ...
Shijie QIN +4 more
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AIP Advances, 2021 In this paper, biomimetic spines on puffer skin were taken as the study object, and numerical simulation was used to study the effect of the spinal arrangement on drag reduction characteristics.
Xiaoming Feng +4 more
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Fluid Drag Reduction by Magnetic Confinement
Langmuir, 2022 The frictional forces of a viscous liquid flow are a major energy loss issue and severely limit microfluidics practical use. Reducing this drag by more than a few tens of percent remain illusive. Here, we show how cylindrical liquid-in-liquid flow leads to drag reduction of 60-99% for sub mm and mm sized channels, irrespective of whether the viscosity ...
Dev, Arvind Arun +3 more
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