TY - CONF
T1 - Drag reduction in channel flow by traveling wave-like surface heating/cooling
AU - Mamori, Hiroya
AU - Fukagata, Koji
AU - Obi, Shinnosuke
AU - Hœpffner, Jerome
N1 - Funding Information:
The authors are grateful to Drs. Nobuhide Kasagi and Yosuke Hasegawa (The University of Tokyo) and Dr. Kaoru Iwamoto (Tokyo University of Agriculture and Technology) for fruitful discussions. This work was supported through Grant-in-Aid for Scientific Research (A) (No. 20246036) by Japan Society for the Promotion of Science (JSPS), Grant-in-Aid for JSPS Fellows (No. 19-07821), and Keio Gijuku
Funding Information:
The authors are grateful to Drs. Nobuhide Kasagi and Yosuke Hasegawa (The University of Tokyo) and Dr. Kaoru Iwamoto (Tokyo University of Agriculture and Technology) for fruitful discussions. This work was supported through Grant-in-Aid for Scientific Research (A) (No. 20246036) by Japan Society for the Promotion of Science (JSPS), Grant-in-Aid for JSPS Fellows (No. 19-07821), and Keio Gijuku Academic Funds.
PY - 2009
Y1 - 2009
N2 - Reduction of skin-friction drag in a channel flow by traveling wave-like surface heating/cooling is investigated by means of linear analysis and direct numerical simulation. The linear analysis reveals that a downstream traveling wave can reduce the skin-friction drag. Due to non-quadrature between the streamwise and the wall-normal velocity disturbances induced by the buoyancy force, negative Reynolds shear stress is created in the regions near the walls, which contributes to the skin-friction drag reduction. The direct numerical simulation shows that a traveling wave at a high wavenumber slightly reduces the friction drag in a fully developed turbulent channel flow. The velocity fluctuations and the Reynolds shear stress are slightly attenuated by this control. The friction drag increases for larger magnitudes and lower wavenumbers of the traveling waves. Non-zero mean temperature profile is created due to the turbulent heat flux induced by the control.
AB - Reduction of skin-friction drag in a channel flow by traveling wave-like surface heating/cooling is investigated by means of linear analysis and direct numerical simulation. The linear analysis reveals that a downstream traveling wave can reduce the skin-friction drag. Due to non-quadrature between the streamwise and the wall-normal velocity disturbances induced by the buoyancy force, negative Reynolds shear stress is created in the regions near the walls, which contributes to the skin-friction drag reduction. The direct numerical simulation shows that a traveling wave at a high wavenumber slightly reduces the friction drag in a fully developed turbulent channel flow. The velocity fluctuations and the Reynolds shear stress are slightly attenuated by this control. The friction drag increases for larger magnitudes and lower wavenumbers of the traveling waves. Non-zero mean temperature profile is created due to the turbulent heat flux induced by the control.
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M3 - Paper
AN - SCOPUS:85002067371
SP - 581
EP - 586
T2 - 6th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2009
Y2 - 22 June 2009 through 24 June 2009
ER -