Bluff Body Drag Reduction Using Passive Flow Control of Jet Boat Tail

2015 ◽  
Vol 8 (2) ◽  
pp. 713-721 ◽  
Author(s):  
Trevor Hirst ◽  
Chuanpeng Li ◽  
Yunchao Yang ◽  
Eric Brands ◽  
Gecheng Zha
Keyword(s):  
Drag Reduction ◽  
Flow Control ◽  
Bluff Body ◽  
Passive Flow Control ◽  
Passive Flow ◽  
Body Drag

scholarly journals Microfiber Coating for Flow Control over a Blunt Surface

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 664 ◽  
Author(s):  
Mitsugu Hasegawa ◽  
Hirotaka Sakaue
Keyword(s):  
Drag Reduction ◽  
Flow Control ◽  
Bluff Body ◽  
Relative Length ◽  
Control Device ◽  
Cylinder Surface ◽  
Passive Flow Control ◽  
Passive Flow ◽  
Maximum Drag Reduction ◽  
The Impact

A microfiber coating having a hair-like structure is investigated as a passive flow control device of a bluff body. The effect of microfiber length is experimentally studied to understand the impact of the coating on drag on a cylinder. A series of microfiber coatings with different lengths are fabricated using flocking technology and applied to various locations over the cylinder surface under the constant Reynolds number of 6.1 × 104 based on the diameter of the cylinder. It is found that the length and the location both play important roles in the drag reduction. Two types of drag reduction can be seen: (1) when the relative length of the microfiber, k/D, is less than 1.8%, and the coating is applied before flow separates over the cylinder; and (2) k/D is over 3.3%, and the coating is applied after the flow separation location on the cylinder. The maximum drag reduction for the former type is 59% compared to that from the cylinder without the microfiber coating. For the latter type, the maximum drag reduction is 27%.

Large eddy simulation of base drag reduction using jet boat tail passive flow control

2020 ◽  
Vol 198 ◽  
pp. 104398 ◽  
Author(s):  
Yunchao Yang ◽  
William Bradford Bartow ◽  
Gecheng Zha ◽  
Heyong Xu ◽  
Jianlei Wang
Keyword(s):  
Large Eddy Simulation ◽  
Drag Reduction ◽  
Flow Control ◽  
Passive Flow Control ◽  
Eddy Simulation ◽  
Passive Flow ◽  
Large Eddy ◽  
Base Drag

scholarly journals Large Eddy Simulation of Base Drag Reduction with Jet Boat-tail Passive Flow Control

2015 ◽  
Vol 126 ◽  
pp. 150-157 ◽  
Author(s):  
Yunchao Yang ◽  
Heyong Xu ◽  
Jianlei Wang ◽  
Gecheng Zha
Keyword(s):  
Large Eddy Simulation ◽  
Drag Reduction ◽  
Flow Control ◽  
Passive Flow Control ◽  
Eddy Simulation ◽  
Passive Flow ◽  
Large Eddy ◽  
Base Drag

scholarly journals Vortex Shedding Suppression: A Review on Modified Bluff Bodies

Eng ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 325-339
Author(s):  
Amir Teimourian ◽  
Hanifa Teimourian
Keyword(s):  
Fluid Dynamics ◽  
Flow Control ◽  
Vortex Shedding ◽  
Bluff Body ◽  
Bluff Bodies ◽  
Experimental Fluid Dynamics ◽  
Passive Flow Control ◽  
Passive Flow ◽  
Unsteady Wake ◽  
Computational Fluid Dynamics Cfd

Vortex shedding phenomenon behind bluff bodies and its destructive unsteady wake can be controlled by employing active and passive flow control methods. In this quest, researchers employed experimental fluid dynamics (EFD), computational fluid dynamics (CFD) and an analytical approach to investigate such phenomena to reach a desired outcome. This study reviews the available literature on the flow control of vortex shedding behind bluff bodies and its destructive wake through the modification of the geometry of the bluff body. Various modifications on the bluff body geometries namely perforated bluff bodies, permeable and porous mesh, corner modification and wavy cylinder have been reviewed. The effectiveness of these methods has been discussed in terms of drag variation, wake structure modifications and Strouhal number alteration.

Computational design and experimental testing of a flexible bi-stable airfoil for passive flow control

2021 ◽  
Author(s):  
Anurag Bhattacharyya ◽  
Mark Bashkawi ◽  
Se Yeon Kim ◽  
Wanzheng Zheng ◽  
Theresa Saxton-Fox ◽  
...  
Keyword(s):  
Flow Control ◽  
Experimental Testing ◽  
Computational Design ◽  
Passive Flow Control ◽  
Passive Flow
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