... 07 2024 24 08 2024 convergent-divergent riblets bio-inspired PIV (particle image velocimetry) hot-wire anemometer (H-W) near wake structure drag reduction Korea Institute of Energy Technology Evaluation and Planning 10.13039/501100007053 20214000000140...

... of the recirculation zone in the near-wake region of the bluff body. Overall, the present study demonstrates the practical effectiveness of using plasma actuators for flow control around FWMSC. e-mail:  mustafa_yousif@pusan.ac.kr Figure 10( a ) demonstrates the percentage of drag reduction ( Δ C D...

.... Along with this, drag-reducing riblets hamper the cross-flow near the wall, thus further decreasing the turbulence intensity. Results suggest that turbulent kinetic energy (TKE) has a similar trend to the drag reduction characteristic near the wall. The finding ascertains the potential application...

... the periodic drag and lift forces. 06 12 2020 24 05 2021 09 07 2021 wake characterization vortex shedding drag reduction square body triangular body Flow around bodies of engineering importance is a long-established topic of interest because the flowing fluid can generate...

...H. Asadzadeh; A. Moosavi; A. Etemadi We study drag reduction of a uniform flow over a flat surface due to a series of rectangular microgrooves created on the surface. The results reveal that making grooves on the surface usually leads to the generation of secondary vortices inside the grooves...

... (they can be created using material deposition techniques). It has been shown that the best performance is achieved when the grooves are aligned with the flow direction and are symmetric. For each class of grooves, there exists an optimal groove spacing, which results in the largest drag reduction...

... Reduction in Rough Pipes ,” J. Fluid Mech. , 45 ( 02 ), pp. 225 – 246 . 10.1017/S0022112071000028 [18] Virk , P. , 1971 , “ An Elastic Sublayer Model for Drag Reduction by Dilute Solutions of Linear Macromolecules ,” J. Fluid Mech. , 45 ( 03 ), pp. 417 – 440 . 10.1017/S0022112071000120...

... and we had 28.2% drag reduction from that of smooth cylinder. Also, the flow on the smooth cylinder separated at around 82 deg but the flow separation on a grooved cylinder appeared beyond 90 deg, that reducing the drag. bluff body circular cylinder blade groove drag reduction energy saving...

..., 2013. Assoc. Editor: Mark R. Duignan. 16 08 2012 27 06 2013 This study attempts to optimize parameters for the microbubble drag reduction in a turbulent flow based on experimental measurements. Five parameters were investigated: three are control factors (the area of air injection...

... and then increases monotonically with separation distance. tandem cylinders drag coefficient drag reduction wake interaction laminar wake approximation papermaking The flow around two or a cluster of cylinders with different orientations is of interest to different fields of engineering...

... reduction envelope is customarily employed to investigate drag reduction phenomena, it is defined only for polymeric fluids in both straight and coiled tubing and for surfactant-based (SB) fluids in straight tubing. No such envelope is available for SB fluids in coiled tubing. The present research aims...

... 08 2012 bluff bodies Cartesian grid method drag reduction flow interference immersed boundary method rounded corner square cylinder vortex shedding The flow around a bluff body such as a square or circular cylinder is one of the most commonly dealt with fluid...

...Bahram Khalighi; Kuo-Huey Chen; G. Iaccarino The unsteady flow around a simplified road vehicle model with and without drag reduction devices is investigated. The simulations are carried out using the unsteady RANS in conjunction with the v 2 -f turbulence model. The corresponding experiments...

... with the modification of the flow field on the cylinder surface. The decreases in the pressure coefficients on the upwind-facing faces and on the leeward-facing faces lead to drag reduction of the controlled cylinder by ∼25% when compared with the uncontrolled cylinder. References 1 Okajima , A. , 1982...

...% of the propulsion power. 27 10 2009 18 12 2010 17 02 2011 17 02 2011 cavitation drag reduction fluid oscillations friction ships Cavitation reduces the friction by decreasing the hull wetted surface but a significant resistance penalty usually appears because of flow...

..., or serrations that have previously been used to reduce airfoil drag will also be considered. 06 06 2010 19 12 2010 04 02 2011 04 02 2011 aerodynamics aerospace components automotive components blades drag reduction fans Industrial fans are widely used for cooling...

... was applied on the new add-on devices. The results from the optimized design were shown to have a 50.9% reduction in drag coefficient. 29 07 2009 06 04 2010 26 08 2010 26 08 2010 agricultural machinery computational fluid dynamics drag reduction fuel Navier-Stokes equations...

... with increasing air flux rate up to an optimum, but the drag rise for greater rates. A synergy of friction reduction under attached ventilated cavity and microbubble drag reduction downstream of it was shown. 31 03 2009 19 03 2010 13 05 2010 13 05 2010 boundary layers bubbles...

... channel flow drag reduction flow visualisation shear turbulence surfactants viscosity It is well known that the presence of small amounts of certain additives (such as polymers or surfactants) in water can result in a considerable reduction in the drag in the turbulent flow, which was named...

...Kelly A. Stephani; David B. Goldstein Viscous drag reduction on a submerged surface can be obtained both in the limit of an unbroken gas film coating the solid and in the nanobubble or perhaps microbubble coating regime when an air layer is created with superhydrophobic coatings. We examine...