Genta
Kawahara
Department
of Mechanical Science and Bioengineering
Graduate
School of Engineering Science, Osaka University
1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
kawahara at
me.es.osaka-u.ac.jp
phone/fax:
+81 (0)6 6850 6160
Research Interests
Fluid
turbulence
Turbulent
heat transfer
Dissimilarity
between momentum and heat transfer
Coherent
structure
Vortex
dynamics
Flow
instability and transition to turbulence
Simple
invariant sets (equilibrium and periodic solutions, and their stable and
unstable manifolds) in turbulent flows
Turbulence
control
Major Publications
(1) G.
Kawahara, S. Kida, M. Tanaka & S. Yanase
Wrap tilt and
stretch of vorticity lines around a strong thin straight vortex tube in a
simple shear flow
J.
Fluid Mech., 353 (1997),
115-162.
(2) M. Tanaka, S. Kida, S.
Yanase & G. Kawahara
Zero-absolute-vorticity
state in a rotating turbulent shear flow
Phys. Fluids, 12-8 (2000), 1979-1985.
(3) J.
Jimenez, M. Uhlmann, A. Pinelli & G. Kawahara
Turbulent shear
flow over active and passive porous surfaces
J.
Fluid Mech., 442 (2001),
89-117.
Periodic motion embedded in plane Couette turbulence: regeneration cycle and burst
J. Fluid Mech., 449
(2001), 291-300.
(5)
G.
Kawahara, J. Jimenez, M. Uhlmann & A. Pinelli
Linear instability
of a corrugated vortex sheet -- a model for streak instability
J. Fluid Mech., 483
(2003), 315-342.
(6)
S.
Yanase, M. Tanaka, S. Kida & G. Kawahara
Generation and sustenance
mechanisms of coherent vertical structures in rotating shear turbulence of
zero-mean-absolute vorticity
Fluid Dynamics Research, 35
(2004), 237-254.
(7) J. Jimenez, G. Kawahara, M.
Simens, M. Nagata & M. Shiba
Characterization of near-wall turbulence
in terms of equilibrium and “bursting” solutions
Phys. Fluids, 17-1
(2005), 015105.
(8) G. Kawahara
Laminarization
of minimal plane Couette flow: Going beyond the basin
of attraction of turbulence
Phys. Fluids, 17-4
(2005), 041702.
(9)
G. Kawahara
Energy dissipation in spiral
vortex layers wrapped around straight vortex tube
Phys. Fluids, 17-5
(2005), 055111.
Elementary coherent structures in
turbulent flows
Parity, 20-12 (2005).
(11)
L.
van Veen, S. Kida & G. Kawahara
Periodic motion representing
isotropic turbulence
Fluid Dynamics Research, 38
(2006), 19-46.
(12)G. Kawahara, S.
Kida & L. van Veen
Unstable periodic motion in turbulent
flows
Nonlinear Process in Geophysics, 13 (2006), 499-507.
(13)M. Uhlmann, A. Pinelli, G. Kawahara
& A. Sekimoto
Marginally turbulent flow in a
square duct
J.
Fluid Mech., 588 (2007),
153-162.
(14)G. Kawahara
Theoretical interpretation of
coherent structures in near-wall turbulence
Fluid Dynamics Research, 41
(2009), 064001.
(15)A. Pinelli, M. Uhlmann, A. Sekimoto
& G. Kawahara
Reynolds number dependence of mean
flow structure in square duct turbulence
J. Fluid Mech., 644
(2010), 107-122.
(16)M. Uhlmann, G. Kawahara
& A. Pinelli
Traveling-waves consistent with
turbulence-driven secondary flow in a square duct
Phys. Fluids, 22-8
(2010), 084102.
(17)L.
van Veen, G. Kawahara & A. Matsumura
On matrix-free computation of 2D
unstable manifolds
SIAM Journal on Scientific Computing, 33 (2011), 25-44.
(18)A. Sekimoto, G. Kawahara, K.
Sekiyama, M. Uhlmann & A. Pinelli
Turbulence- and buoyancy-driven
secondary flow in a horizontal square duct heated from below
Phys. Fluids, 23-7
(2011), 075103.
Homoclinic
tangle on the edge of shear turbulence
Phys. Rev. Lett., 107-11
(2011), 114501.
(20)G. Kawahara, M. Uhlmann
& L. van Veen
The significance of simple
invariant solutions in turbulent flows
Ann. Rev. Fluid Mech., 44
(2012), 203-225.
(21)M.
Shimizu, P. Manneville, Y. Duguet & G. Kawahara
Splitting of a turbulent puff in
pipe flow
Fluid Dynamics Research, 46
(2014), 061403.
(22)T.
Yasuda, S. Goto & G. Kawahara
Quasi-cyclic evolution of
turbulence driven by a steady force in a periodic cube
Fluid Dynamics Research, 46 (2014), 061413.
(23)S.
Goto, M. Shimizu & G. Kawahara
Turbulent mixing in a precessing sphere
Phys. Fluids, 26 (2014),
115106.
(24)K.
Takeishi, G. Kawahara, M. Uhlmann & A. Pinelli
Localized turbulence structures in
transitional rectangular-duct flow
J. Fluid Mech., 782 (2015), 368-379.