TY - JOUR
T1 - Relaminarization of turbulent channel flow using traveling wave-like wall deformation
AU - Nakanishi, Rio
AU - Mamori, Hiroya
AU - Fukagata, Koji
N1 - Funding Information:
The authors are grateful to Dr. Shinnosuke Obi (Keio University), Dr. Jerome Hœpffner (UPMC), Drs. Nobuhide Kasagi and Yosuke Hasegawa (The University of Tokyo), and Dr. Kaoru Iwamoto (Tokyo University of Agriculture and Technology) for fruitful discussion. This work was supported through Grant-in-Aid for Scientific Research (A) (No. 20246036) and Grant-in-Aid for JSPS Fellows (23·3928, 2011) by Japan Society for the Promotion of Science (JSPS) and Keio University Global COE Program of “Center for Education and Research of Symbiotic, Safe and Secure System Design.”
PY - 2012/6
Y1 - 2012/6
N2 - Effect of traveling wave-like wall deformation (i.e. peristalsis) in a fully developed turbulent channel flow is investigated by means of direct numerical simulation. We not only demonstrate that the friction drag is reduced by wave-like wall deformation traveling toward the downstream direction, but also show that the turbulence is completely suppressed (viz. the flow is relaminarized) under some sets of parameters. It is also found that at higher amplitude of actuation the relaminarized flow is unstable and exhibits a periodic cycle between high and low drag. The drag reduction is caused by suppression of random Reynolds shear stress component due to stabilization. The quadrant analysis reveals that traveling wave-like wall deformation makes strongly negative random Reynolds shear stress in the converging region.
AB - Effect of traveling wave-like wall deformation (i.e. peristalsis) in a fully developed turbulent channel flow is investigated by means of direct numerical simulation. We not only demonstrate that the friction drag is reduced by wave-like wall deformation traveling toward the downstream direction, but also show that the turbulence is completely suppressed (viz. the flow is relaminarized) under some sets of parameters. It is also found that at higher amplitude of actuation the relaminarized flow is unstable and exhibits a periodic cycle between high and low drag. The drag reduction is caused by suppression of random Reynolds shear stress component due to stabilization. The quadrant analysis reveals that traveling wave-like wall deformation makes strongly negative random Reynolds shear stress in the converging region.
KW - Direct numerical simulation
KW - Drag reduction
KW - Relaminarization
KW - Turbulent channel flow
KW - Wall deformation
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U2 - 10.1016/j.ijheatfluidflow.2012.01.007
DO - 10.1016/j.ijheatfluidflow.2012.01.007
M3 - Article
AN - SCOPUS:84862319187
SN - 0142-727X
VL - 35
SP - 152
EP - 159
JO - International Journal of Heat and Fluid Flow
JF - International Journal of Heat and Fluid Flow
ER -