Flow control and drag reduction
Drag reduction via turbulent boundary layer flow control
... skin-friction drag reduction through passive and active flow control is still at an early stage in its devel- ...body-force control strate- gies have been shown to give drag ...
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Effectiveness of active flow control for turbulent skin friction drag reduction
... reliable flow control to reduce turbulent skin friction drag is of paramount importance in many engineering applications, including aerospace engineering, where the skin friction component is ...
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Toward Understanding Underlying Mechanisms of Drag Reduction in Turbulent Flow Control
... channel flow (plane Poiseuille) geometry, the underlying drag-reduction mechanisms of three flow-control strategies, namely polymer additives, slip surfaces, and external body forces, ...
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EXPERIMENTAL INVESTIGATION OF DRAG REDUCTION ON AHMED MODEL USING A COMBINATION OF ACTIVE FLOW CONTROL METHODS
... Aerodynamic drag is an important factor in vehicle’s fuel consumption. Pressure drag which is the main component of total drag is a result of boundary layer separation from vehicle ...active ...
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Drag Reduction by Laminar Flow Control
... the drag coefficient of a turbulent fuselage as a baseline for the evaluation of ...of drag reduction due to the delay of transition, preserving the laminar boundary ...the drag calculations. ...
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Wing Tip Drag Reduction at Nominal Take-Off Mach Number: An Approach to Local Active Flow Control with a Highly Robust Actuator System
... active flow control technology to increase the aerodynamic efficiency of an aircraft during ...increased drag, is triggered by the strong slat edge vortex at high angles of ...complex flow is ...
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Skin-Friction Drag Reduction in a Turbulent Channel Flow based on Wall Shear-Free Control
... Active flow control of wall-bounded turbulent flow for skin-friction drag reduction (DR) has been received great attention in recent years due to large economical and ecological ...
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Drag Coefficient Reduction Of A 30° Yaw Angle Cube Subjected To Active Flow Control Device By Means Of Numerical Investigation
... active flow control devices are applied to a 30° yaw cube is numerically studied by using a commercial software known as ANSYS Fluent at a Reynolds Number of ...of drag reduction on the cube ...
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Modification of Flow Structure Over a Van Model By Suction Flow Control to Reduce Aerodynamics Drag
... develop control solutions that enable to reduce the aerodynamic drag of vehicle and significant modification progress is still possible by reducing the mass, rolling friction or aerodynamic ...Some ...
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Review on Aerodynamic Drag Reduction of Vehicles
... active flow control is a mechanism that modifies the flow field in the wake region in order to reduce the aerodynamic drag by increasing static ...aerodynamic drag, and hence, the ...
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An In depth Study on Drag Reduction of Turbulent Channel Flow Induced by Spatially Oscillating Lorentz Force
... turbulent flow artificially was believed to be extremely difficult several decades ago, until the discovery of turbulent coherent structures and improved understanding of the underlying physics of turbulent ...
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Mini Spoilers for Afterbody Base Drag Reduction
... passive flow control technique in order to reduce afterbody vortex drag on a slanted base cylinder model with an upsweep angle Φ = ...vortex flow structure at slant angles below about 30°. The ...
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Numerical Drag Reduction Studies on Generic Truck
... passive flow control devices for drag reduction (vortex generators, microramps, LEBU, ...active flow control methods, other than injection and suction, have been a subject of ...
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Spatially distributed control for optimal drag reduction of the flow past a circular cylinder
... natural drag reduction at low Reynolds numbers, we performed complementary simulations at Re = 300 with a cylinder span of L = 4D, thus matching the wavelengths of modes A and ...a drag coefficient of ...
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Drag Reduction and Secondary Flow Occurrence by Square Biplane Grid
... There are two types of square lattice structures to control various industrial flow fields, biplane grid and woven screen. In particular, the square biplane grid which consists of many cylinders arrayed at ...
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CFD simulation of drag reduction in pipe flow by turbulence energy promoters
... passive control of drag reduction ...the drag reduction nature of dolphin’s skin ...the drag up to 60%, however, the sensitivity to the pressure gradients is very high and the ...
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Turbulent skin friction drag reduction control by spanwise motion
... proper flow characteristic scales are chosen for ...turbulent flow can be divided into an inner region and an outer ...the flow is scaled in the viscous length scale, ...the flow, and the ...
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Polymer Drag Reduction for Single-Phase Water Flow in and around 180° Bends
... Experimental flow loop The flow loop was setup at Richmond Field Station of University of California Berkeley to study single- and two-phase DR in and around ...The flow loop is divided into fluid ...
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Passive Control of Base Drag Employing Dimple in Subsonic Suddenly Expanded Flow
... drag reduction in the absence of jet flow at the ...net drag reduction in diff erent speed ...the flow and the likely fluid-dynamical mechanism associated with the devices leading ...
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Experimental Investigation of Drag Reduction in Turbulent Flow Using Biological and Synthetic Macromolecules: A Comparative Study.
... 6 Fig. 2 Photograph of the experimental apparatus Three concentrations of 6 kinds of dilute polymeric solutions as a drag reducer were examined at three temperatures and flow rates in the device connected with two ...
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