Optimal control of turbulent transport phenomena
・Friction drag reduction
Optimal control of wall turbulence with wall blowing and
suction
(left) uncontrolled and (right) controlled
The blue and white contours show low
speed regions and vortex cores, respectively.
The color on the wall in the right figure shows the optimal
control input.
Direct numerical simulation of turbulent boundary
layer
(left) with uniform wall blowing, (middle) uncontrolled (right) with body-force
damping
Collaboration with KTH Royal Institute of Technology in Stockholm, Sweden and Karlsruhe Institute
of Technology in Germany.
Reference: Stroh et al. (J. Fluid Mech., 2016)
Control for reduction of friction drag in wall turbulence by spanwise
wall oscillation
(Top) without control, (Bottom) with control
Reference: Ricco et al. (J.
Fluid Mech., 2012), Cimarelli et al. (Phys. Fluids, 2013), Yakeno et al. (Phys. Fluids, 2014)
・Dissimilar control of heat and momentum transfer
Optimal Control for Dissimilar Heat Transfer Enhancement in a Fully
Developed Channel Flow
Date: Feb. 5th, 2021 Presenter: Yosuke Hasegawa
Mechanism of dissimilar heat transfer enhancement in a laminar channel flow subjected to wall blowing
and suction
Presentation at FMFP2020 (Dec 9-10, 2020) by Arjun John Kaithakkal
The streamwise velocity and the temperature in a fully developed
turbulent channel flow subject to traveling wave-like wall blowing and suction
(Top)
uncontrolled, (Bottom) controlled
Reference: Kaithakkal et al. (J. Fluid Mech., 2020)
Suboptimal control for dissimilar heat transfer enhancement in wall
turbulence
White: vortex core, Color on the wall: control input (wall blowing and
suction)
Reference: Hasegawa & Kasagi (J. Fluid Mech., 2011)
Optimal control for dissimilar heat transfer enhancement in wall
turbulence
(Top): Streamwise velocity component, (Bottom): Temperature
Reference: Yamamoto
et al. (J. Fluid Mech., 2013)
Control inputs obtained by optimal control theory for dissimilar heat
transfer enhancement in wall turbulence
Red: wall blowing, Blue: wall suction
(Top): top
wall, (Bottom) bottom wall
Reference: Yamamoto et al. (J. Fluid Mech., 2013)
Poster
