channel wall drag reduction
Turbulent channel flow over an anisotropic porous wall - drag increase and reduction
... parallel wall bounded flows. Preliminary simulations of wall bounded turbulent flows have shown a potential for drag reduction (Gomez-de Segura et ...relaxing wall permeability triggers ...
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A numerical study of turbulent drag reduction using streamwise travelling waves of spanwise wall velocity
... the wall oscillation and travelling wave ...minimal channel flow, although the fact that the two studies agree help validate the ...size channel flow, these results are considered to be highly ...
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The effect of Reynolds number on turbulent drag reduction by streamwise travelling waves
... Fully developed turbulent channel flow with wall control is considered using direct nu- merical simulation. The results presented are generated by a DNS code (Chung & Talha 2011), based on the fully ...
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Effects of Grooves on Drag in Laminar Channel Flow
... laminar channel flows. The wall topographies were expressed using the two-dimensional Fourier ...grooved channel as through the reference smooth ...the reduction of pressure losses in spite of ...
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RELAMINARIZATION OF TURBULENT CHANNEL FLOW USING TRAVELING WAVE-LIKE WALL DEFORMATION
... of drag reduction by traveling wave-like blowing and suction is considered to be pumping from the ...deforming wall (more generally known by the term “peristalsis”) has the pumping effect in the same ...
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An In depth Study on Drag Reduction of Turbulent Channel Flow Induced by Spatially Oscillating Lorentz Force
... The mean streamwise velocity profiles are shown in Figure 4(a) in a log-law plot, where the blue solid line with circle represents the no-control and the red solid line with star represents the controlled flow. It is ...
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Turbulent drag reduction through oscillating discs
... the wall by viscous ...the wall (not shown) reveal that the intensity of these structures is weakened significantly, similarly to the steady disc-flow ...
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Turbulent Drag Reduction by Spanwise Wall Oscillations
... of wall oscillation as a control scheme of drag ...peak wall speed on drag reduction at a Reynolds number of 180 based on wall-shear velocity and channel half-width as ...
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Increasing Strickler coefficient by the drag reduction technique in open-channel flows
... The drag reduction method by polymer additives is generally used to reduce friction losses in pipes over long- ...the reduction of water depth led us to study experimentally the drag ...
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Turbulent channel flow near maximum drag reduction: simulations, experiments and mechanisms
... the drag in a turbulent flow of a polymer solution is significantly reduced compared to Newtonian ...maximum drag reduction or Virk (1975) ...maximum drag reduction the slope of the mean ...
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A Review on “Reduction of Drag Force using ADD ON Devices”
... Fig 2: Wake produce at back side of vehicles[9] This local disturbance in the flow pattern behind the vehicle actually causes a momentum loss (or form drag) which extends far behind the vehicle and is described ...
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Optimal Trajectory of Underwater Manipulator Using Adjoint Variable Method for Reducing Drag
... where the parameters a, b, c, and d in Equation (16) are constants. The first and second terms in Equation (16) are the constraints with respect to the target angle a of joint 1 and target angle b of joint 2, ...
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Drag reduction by using the microriblet of sawtooth and scalloped types
... 3% drag reduction can be drawn for a commercial plane considering the limitations in the areas where riblets can be performed ...for drag reduction goals, which has been strongly used in ...
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Design and Analysis of a Car Rear Spoiler for Drag Reduction
... reduce drag and increase fuel ...decreases drag, which increases fuel economy; it also helps keep the rear window clear because the air flows smoothly through the rear ...and drag prediction on the ...
6
Reduction of Induced Drag Using Wing Tip Propeller
... A blended winglet is attached to the wing with a smooth curve instead of a sharp angle in order to reduce both interference drag and the induced drag. A wingtip fence refers to the winglets used in some ...
5
DRAG REDUCTION USING VORTEX GENERATOR ON A PASSENGER VEHICLE
... aerodynamic drag. One of the main causes of aerodynamic drag in vehicle is flow separation near the vehicle’s rear ...create drag, but they also reduce drag by preventing flow separation at ...
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Study and development of the drag reduction system for go-kart
... aerodynamic drag and good directional stability ...to channel the airflows perfectly through the car body, in order to generate as much downforce as possible; therefore the downforce will thrust the car ...
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Spike Effects on Drag Reduction for Hypersonic Lifting Body
... Considering the simplification and reliability of the drag reduction system, on the basis of Schulein’s self-aligning aerospike [31], a double flat faced disk aerospike with an installat[r] ...
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Review of Research on Vehicles Aerodynamic Drag Reduction Methods
... aerodynamic drag experienced by passenger ...aerodynamic drag reduction mechanism of a passenger car cruising at high speed via an actively translating rear diffuser ...aerodynamic drag ...
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Computational investigation of drag reduction on a rotationally oscillating cylinder
... large drag reduction experimentally observed for the ...but drag reduction still results from control with amplitudes and frequencies that eciently cut o separating layers, allowing some ...
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