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Numerical study of air layer drag reduction of an axisymmetric body in oscillatory motions
The air layer drag reduction (ALDR) of an axisymmetric body in oscillatory motions is investigated in this paper with open source toolbox OpenFOAM....
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A Review of Drag-Reducing Agents (DRAs) in Petroleum Industry
Increasing the flow capacity and pum** rates is challenging in petroleum production systems due to drag or frictional losses. Drag-reducing agents...
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Drag reduction and hairpin packets of the turbulent boundary layer over the superhydrophobic-riblets surface
This paper presents experimental measurements by the time-resolved particle image velocimetry (TR-PIV) for the turbulent boundary layer (TBL) over...
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Sliding frictional characteristic of tight sandstone and its influence on the hydraulic fracture complexity
The complexity of the fracture network during hydraulic fracturing is closely related to the frictional characteristics of the reservoir rock, which...
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Research on the sampling performance of a new bionic gravity sampler
Gravity sampling is of vital importance for sampling seabed sediments and understanding submarine sedimentary environments and resources. In this...
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Numerical investigation of frictional drag reduction with an air layer concept on the hull of a ship
A novel air bubble lubrication method using the winged air induction pipe (WAIP) device is used to reduce the frictional drag of the hull of the ship...
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Moving intruder out of noncohesive and cohesive granular assemblies
This paper numerically provides insights into the uplifting process of a circular plate intruder within cohesive and non-cohesive granular assemblies...
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Experimental investigation of wall-bounded turbulence drag reduction by active control of double piezoelectric vibrator
In order to manipulate large-scale coherent structures in the wall-bounded turbulence and reduce the skin-friction, an active-control experimental...
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Research progress of slippage characteristic and gas film stability enhancement methods on biomimetic hydrophobic surfaces
The biomimetic hydrophobic surface is a potentially efficient underwater drag reduction method and the drag reduction mechanism of this kind of...
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Investigation on the vortical structures by the Liutex method in turbulent channels at Reτ = 180 with scalloped and triangular riblet control
Riblets are a series of small protrusions formed along the flow direction, which have been extensively studied as a passive turbulent drag reduction...
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Effects of single circular synthetic jet on turbulent boundary layer
The periodic synthetic jet emerging from a circular orifice actively controls the turbulent boundary layer (TBL). A time-resolved particle image...
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Numerical study on the wave pattern characteristic of air layer in cavity and the effects of multiple influence factors
Air-layer drag reduction (ALDR) technology for ship energy saving is getting more and more attention in recent years because of the outstanding drag...
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Assessment of aerodynamic roughness parameters of turbulent boundary layers over barnacle-covered surfaces
Full-scale drag penalty predictions of flows over rough walls require surface roughness characterisation from laboratory experiments or numerical...
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Experimental Study of Air Layer Drag Reduction with Bottom Cavity for A Bulk Carrier Ship Model
Air lubrication by means of a bottom cavity is a promising method for ship drag reduction. The characteristics of the bottom cavity are sensitive to...
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A comprehensive comparative investigation of frictional force models for dynamics of rotor-bearing systems
Vibrations of a rotor-bearing system (RBS) can be affected by the frictional forces between the components of the inherent bearings. Thus, an...
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Soft computing method for predicting pressure drop reduction in crude oil pipelines based on machine learning methods
In the oil industry, the drag-reducing agent has been used to reduce turbulent friction of fluids. The main effort of this study is to examine the...
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Drag Reducing Agents: A Historical Perspective
Chapter 1 gives a general overview about different types of drag reducing agents, such as polymers, solid-particle suspensions, biological additives,...
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Numerical investigation of influence of pantograph parameters and train length on aerodynamic drag of high-speed train
This study investigates the influence of different pantograph parameters and train length on the aerodynamic drag of high-speed train by the delayed...
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Numerical simulation of micro-bubble drag reduction of an axisymmetric body using OpenFOAM
The two-phase micro-bubble flow over an axisymmetric body is investigated using the OpenFOAM framework. The numerical model consists of an...
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A numerical study of hydrodynamic characteristics and hydrological processes in the coastal wetlands during extreme events
Providing accurate predictions of extreme water levels through numerical simulation has become essential for disaster prevention and damage...