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Evaluation of Suboptimal Control in Turbulent Channel Flow
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 Title & Authors
Evaluation of Suboptimal Control in Turbulent Channel Flow
Seong, Hyeong-Jin; Choe, Jeong-Il;
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A systematic analysis is made of suboptimal control for drag reduction. The influence of the amplitude of actuation (A) and the time scale of actuation (t(sub)a(sup)+) is evaluated. Two wall sensing variables are employed (∂w/∂y│(sub)w and ∂p/∂z│(sub)w) with two wall actuations (and ). To test the suboptimal control, direct numerical simulations of turbulent channel flow at Re(sub)=100 are performed in a spectral domain. It is found that the effect of A and t(sub)a(sup)+∼1. The near-wall behaviors of flow structure are analyzed to characterize the drag reduction. The size effect of the sensor/actuator is examined.
Suboptimal Control;Drag reduction;Turbulent Channel Flow;
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원관내 유동에서의 준최적 제어의 평가,최정일;;성형진;

대한기계학회논문집B, 2002. vol.26. 2, pp.345-352 crossref(new window)
Robinson, S. K., 1991, 'Kinematics of Turbulent Boundary Layer Structure, Ph. D. dissertation, Stanford University, Stanford, CA

Kim, J., Moin, P. and Moser, R.K., 1987, 'Turbulence Statistics in Fully Developed Channel Flow at Low Reynolds Number,' J. Fluid Mech., Vol. 177, pp.133-166 crossref(new window)

Choi, H., Moin, P., and Kim, J., 1994, 'Active Tubulence Control for Drag Reduction in Wall-Bounded Flow,' J. Fluid Mech., Vol. 262, pp.75-110 crossref(new window)

Lee, C.,Kim, J., Babcock, D. and Goodman, R., 1997, 'Application of Neural Networks to Turbulence Control for Drag Reduction,' Phys. Fluids, Vol. 9, pp.1740-1747 crossref(new window)

Lee, C., Kim, J. and Choi, H., 1998, 'Suboptimal Control of Turbulent Channel Flow for Drag Reduction,' J. Fluid Mech., Vol.358, pp.245-258 crossref(new window)

Hammond, E.P.,Bewley, T.R. and Moin, P., 1998, 'Observed Mechanism for Turbulence Attenuation and Enhancement in Opposition-Controlled Wall-Bounded Flows,' Phys. Fluids, Vol. 10, pp.2421-2423 crossref(new window)

Kim, J. and Sparlart, 1987, 'Scaling of the Bursting Frequency in Turbulent Boundary Layers at Low Reynolds Numbers,' Phys. Fluids., Vol.30, pp.3326-3328 crossref(new window)

Kim, J., 1989, 'On The Structure of Pressure Fluctuations in Simulated Turbulent Channel Flow,' J. Fluid Mech., Vol. 205, pp.421-451 crossref(new window)

Lee, I. and Sung, H.J., 1999, 'Development of an Array of Pressure Sensors with PVDF Film,' Exp. Fluids, Vol. 26, pp.27-35 crossref(new window)

Jimnez, J. and Moin, P., 1991, 'The Minimal Flow Unit in Near-Wall Turbulence,' J. Fluid Mech., Vol.225, pp.213-240 crossref(new window)