26 citations · 128 across the 12 of their papers we have counts for
12 papers
Spectral analysis on transport budgets of turbulent heat fluxes in plane Couette turbulence
Takuya Kawata, Takahiro Tsukahara
In recent years, scale-by-scale energy transport in wall turbulence has been intensively studied, and the complex spatial and interscale transfer of turbulent energy has been inves…
Scale interactions in turbulent plane Couette flows in minimal domains
Takuya Kawata, Takahiro Tsukahara
Interscale energy transfer in wall turbulence has been intensively studied in recent years, and both the forward (i.e. from larger to smaller scales) and reversed transfers of turb…
Viscoelasticity-induced pulsatile motion of 2D roll cell in laminar wall-bounded shear flow
Tomohiro Nimura, Takuya Kawata, Takahiro Tsukahara
For the clarification of the routes to elasto-inertial turbulence (EIT), it is essential to understand how viscoelasticity modulates coherent flow structures including the longitud…
Viscoelastic effect on steady wavy roll cells in wall-bounded shear flow
Tomohiro Nimura, Takuya Kawata, Takahiro Tsukahara
An alternative step in understanding the flows of near wall drag-reducing turbulence can be examining the flow in a well-organized streamwise vortex with a laminar background. Here…
DNS of Taylor-Couette flow between counter-rotating cylinders at small radius ratio
Ryo Tanaka, Takuya Kawata, Takahiro Tsukahara
A counter-rotating Taylor-Couette flow with relatively small radius ratios of = 0.2--0.5 was investigated over a wide range of the Reynolds number, from laminar to turbulent re…
Laminar-turbulent coexistence in annular Couette flow
Kohei Kunii, Takahiro Ishida, Yohann Duguet +1
Annular Couette flow is the flow between two coaxial cylinders driven by the axial translation of the inner cylinder. It is investigated using direct numerical simulation in long d…
Turbulent bifurcations in intermittent shear flows: from puffs to oblique stripes
Takahiro Ishida, Yohann Duguet, Takahiro Tsukahara
Localised turbulent structures such as puffs or oblique stripes are building blocks of the intermittency regimes in subcritical wall-bounded shear flows. These turbulent structures…
Development of a turbulent spot into a stripe pattern in plane Poiseuille flow
Hiroshi Aida, Takahiro Tsukahara, Yasuo Kawaguchi
A structure consisting of quasi-laminar and turbulent regions in a stripe pattern, which can be found in a transitional plane channel flow, is called `turbulent stripe'. In the pre…
Turbulent heat transfer in a channel flow at transitional Reynolds numbers
Takahiro Tsukahara, Hiroshi Kawamura
Direct numerical simulation of a turbulent channel flow with heat transfer was performed at very low Reynolds numbers. Two different thermal boundary conditions were studied, and t…
An experimental study on turbulent-stripe structure in transitional channel flow
Takahiro Tsukahara, Yasuo Kawaguchi, Hiroshi Kawamura
Turbulent stripe, which would occur in turbulent channel flows at transitional Reynolds numbers, was studied experimentally by flow visualization using reflective flake particles.…
DNS of heat transfer in a transitional channel flow accompanied by a turbulent puff-like structure
Takahiro Tsukahara, Kaoru Iwamoto, Hiroshi Kawamura +1
Direct numerical simulations of turbulent heat transfer in fully-developed channel flows have been performed in a range of friction Reynolds number between 60 and 180, based on the…
DNS of turbulent channel flow at very low Reynolds numbers
Takahiro Tsukahara, Yohji Seki, Hiroshi Kawamura +1
Direct numerical simulations (DNS) of fully-developed turbulent channel flows for very low Reynolds numbers have been performed with a larger computational box sizes than those of…