115 Optimization of an anisotropic compliant surface for turbulent friction drag reduction(2)

2007 ◽  
Vol 2007 (0) ◽  
pp. _115-1_-_115-4_
Author(s):  
Koji FUKAGATA ◽  
Stefan KERN ◽  
Philippe Chatelain ◽  
Petros KOUMOUTSAKOS ◽  
Nobuhide KASAGI
Keyword(s):  
Drag Reduction ◽  
Friction Drag ◽  
Turbulent Friction ◽  
Compliant Surface ◽  
Friction Drag Reduction

115 Optimization of an anisotropic compliant surface for turbulent friction drag reduction(1)

2007 ◽  
Vol 2007 (0) ◽  
pp. _115-a_
Author(s):  
Koji FUKAGATA ◽  
Stefan KERN ◽  
Philippe Chatelain ◽  
Petros KOUMOUTSAKOS ◽  
Nobuhide KASAGI
Keyword(s):  
Drag Reduction ◽  
Friction Drag ◽  
Turbulent Friction ◽  
Compliant Surface ◽  
Friction Drag Reduction

scholarly journals Evolutionary optimization of an anisotropic compliant surface for turbulent friction drag reduction

2008 ◽  
Vol 9 ◽  
pp. N35 ◽  
Author(s):  
Koji Fukagata ◽  
Stefan Kern ◽  
Philippe Chatelain ◽  
Petros Koumoutsakos ◽  
Nobuhide Kasagi
Keyword(s):  
Drag Reduction ◽  
Evolutionary Optimization ◽  
Friction Drag ◽  
Turbulent Friction ◽  
Compliant Surface ◽  
Friction Drag Reduction

Turbulent Friction Drag Reduction on Clark-Y Airfoil by Passive Uniform Blowing

AIAA Journal ◽  
2020 ◽  
Vol 58 (9) ◽  
pp. 4178-4180
Author(s):  
Shiho Hirokawa ◽  
Masahiro Ohashi ◽  
Kaoruko Eto ◽  
Koji Fukagata ◽  
Naoko Tokugawa
Keyword(s):  
Drag Reduction ◽  
Friction Drag ◽  
Turbulent Friction ◽  
Friction Drag Reduction

Proposal of resolvent-based feedback control for turbulent friction drag reduction

2018 ◽  
Vol 2018 (0) ◽  
pp. OS1-16
Author(s):  
Aika KAWAGOE ◽  
Satoshi NAKASHIMA ◽  
Mitul LUHAR ◽  
Koji FUKAGATA
Keyword(s):  
Feedback Control ◽  
Drag Reduction ◽  
Friction Drag ◽  
Turbulent Friction ◽  
Friction Drag Reduction

scholarly journals Influence of length of polymer aggregation on turbulent friction drag reduction effect

2017 ◽  
Vol 12 (2) ◽  
pp. JFST0013-JFST0013 ◽  
Author(s):  
Masanari FUJIMURA ◽  
Kaoru IWAMOTO ◽  
Akira MURATA ◽  
Mitsutoshi MASUDA ◽  
Hirotomo ANDO ◽  
...  
Keyword(s):  
Drag Reduction ◽  
Friction Drag ◽  
Turbulent Friction ◽  
Reduction Effect ◽  
Friction Drag Reduction

Resolvent Analysis of Turbulent Friction Drag Reduction by Manipulation of Mean Velocity Profile

2019 ◽  
Author(s):  
Riko Uekusa ◽  
Aika Kawagoe ◽  
Yusuke Nabae ◽  
Koji Fukagata
Keyword(s):  
Velocity Profile ◽  
Drag Reduction ◽  
Turbulent Viscosity ◽  
Turbulent Channel Flow ◽  
The Other ◽  
Friction Drag ◽  
Mean Velocity ◽  
Turbulent Friction ◽  
The Mean ◽  
Friction Drag Reduction

Abstract In the present study, we numerically manipulate the mean velocity profile of a turbulent channel flow and assess the friction drag reduction performance by using resolvent analysis. Building on the implication obtained from Kühnen et al. (Nat. Phys., Vol. 14, 2017, pp. 386–390) that modifying mean velocity profile flat leads to significant drag reduction, we first introduce two functions for turbulent mean velocity, which can express ‘flattened’ profiles: one is derived based on the turbulent viscosity model proposed by Reynolds & Tiederman (J. Fluid Mech., Vol. 658, 2010, pp. 336–382), and the other is based on the mean velocity profile of laminar flow. These functions are used as the mean velocity profile for the resolvent analysis, and the flatness of the resulting profiles is characterized by two different measures. As a result, we confirm that, friction drag reduction is achieved if the turbulent mean velocity profile is ‘flattened’. However, we also find that the flatness of the mean velocity profile in the center of the channel alone is not enough to evaluate the drag reduction performance.

Friction drag reduction based on a proportional-derivative control scheme

2021 ◽  
Vol 33 (7) ◽  
pp. 075115
Author(s):  
Chi Wai Wong ◽  
Xiaoqi Cheng ◽  
Dewei Fan ◽  
Wenfeng Li ◽  
Yu Zhou
Keyword(s):  
Drag Reduction ◽  
Friction Drag ◽  
Control Scheme ◽  
Friction Drag Reduction ◽  
Derivative Control
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