Fluid Engineering Lab. Osaka Univ.
CFD Gallery
Data Assimilation of Flow around a Hydrofoil Using PIV Data
(MP4, 5.13MB)S. Okamura, K. Okabayashi
"Twin experiments for data assimilation of cavitating flow around a hydrofoil"
International Journal of Multiphase Flow 2025 (Accepted for publication)
Data Assimilation of Cavitating Flows (Twin Experiments)
(MP4, 1.57MB)S. Okamura, K. Okabayashi
"Twin experiments for data assimilation of cavitating flow around a hydrofoil" International Journal of Multiphase Flow 2025 (Accepted for publication)
Modelling of fluid boundary conditions at the envelope of a fibre layer (canopy)
(MP4, 39MB)S. Akita, K. Okabayashi, S. Takeuchi
"Envelope boundary conditions for the upper surface of two-dimensional canopy interacting with fluid flow"
Microfluidics and Nanofluidics Vol.29, Article Number 7, 2025
DOI:https://doi.org/10.1007/s10404-024-02779-z
URL:https://hdl.handle.net/11094/99612
Flow Control Using Deep Reinforcement Learning
(MP4, 767KB)T. Sakamoto, K. Okabayashi
"Optimization of fluid control laws through deep reinforcement learning using dynamic mode decomposition as the environment" (Editor's Pick)
AIP Advances Vol.14, Issue 11, 115204, 2024
DOI:https://doi.org/10.1063/5.0237682
Extending Pressure Data with Super-Resolution Machine Learning
(MP4, 1.8MB)K. Hino, K. Okabayashi
"Estimation of 2D pressure and cavitation fields from sparse pseudo-pressure sensor point data using super-resolution machine learning"
Transactions of the JSME Vol.90, No. 937, p.24-00115 2024
DOI:https://doi.org/10.1299/transjsme.24-00115
Optimization of Airfoil Geometry by Deep Reinforcement Learning
(MP4, 600KB)T. Noda, K. Okabayashi, S. Kimura, S. Takeuchi, T. Kajishima
"Optimization of configuration of corrugated airfoil using deep reinforcement learning and transfer learning"
AIP Advances Vol.13(3), 035328, 2023
DOI:https://doi.org/10.1063/5.0134198
Unsteady Phenomena of Cavitation and Turbulent Vortices around a Hydrofoil
(color: isosurfaces of Q=200 colored by vorticity in span direction, opaque white: isosurfaces of void ratio 10%)
(MP4, 17MB)K. Okabayashi, A. Furukawa, T. Otsu, T. Kajishima
"LES Study on the Relationship between Large-scale Turbulence Vortices and Unsteady Cavitation around a Hydrofoil"
Journal of Fluids Engineering Vol.145(4) (2022) 041204.
DOI:https://doi.org/10.1115/1.4056525
Commentary: https://www.youtube.com/watch?v=Gf8HnDKRkw4&t=15s
Coherent motions in particle-dispersed Rayleigh-Benard convection
(MP4, 12MB)
(MP4, 29MB)S. Takeuchi, T. Tsutsumi, T. Kajishima
"Effect of temperature gradient within a solid particle on the rotation and oscillation modes in solid-dispersed two-phase flows"
International Journal of Heat and Fluid Flow Vol.43, October 2013, pp.15-25
DOI https://doi.org/10.1016/j.ijheatfluidflow.2013.05.013
URL http://hdl.handle.net/11094/57200 (a longer version of animation available)
S. Takeuchi, Y. Miyamori, J. Gu, and T. Kajishima
"Flow reversals in particle-dispersed natural convection in a two-dimensional enclosed square domain"
Phys. Rev. Fluids 4, 084304 (2019) - Published 21 August 2019
DOI https://doi.org/10.1103/PhysRevFluids.4.084304
URL http://hdl.handle.net/11094/73149 (a longer version of animation available)
Filament motion in a lid-driven cavity flow
(MP4, 3.8MB)
(MP4, 3.8MB)
Inextensible filament with/without (left/right) bending stiffness
S. Takeuchi, H. Fukuoka, J. Gu and T. Kajishima
"Interaction problem between fluid and membrane by a consistent direct discretisation approach "
Journal of Computational Physics Vol.371, (2018) pp.1018-1042
DOI https://doi.org/10.1016/j.jcp.2018.05.033
S. Miyauchi, A. Ito, S. Takeuchi and T. Kajishima
"Fixed-mesh approach for different dimensional solids in fluid flows : application to biological mechanics"
Journal of Mechanical Engineering and Sciences Vol.6, (2014) pp.818-844
URL https://ir.library.osaka-u.ac.jp/repo/ouka/all/71460/JMES2014_OUKAversion-1.pdf
Uni-directional flows in oscillation-controlled coaxial pipe heat exchanger
(MP4, 16.3MB)
D. Takagi, S. Takeuchi, T. Kajishima
"Role of Vortical Structures on the Forced Convective Heat Transfer in Oscillation-Controlled Coaxial-Pipe Heat Exchanger" Journal of Enhanced Heat Transfer Vol.22, 2015, pp.365-389
DOI https://doi.org/10.1615/JEnhHeatTransf.2016015399
Natural convection with conductive particles
(MP4, 12.0MB)
(MP4, 4.0MB)Left: Natural conv. with conductive particles Right: Contact heat transfer
Takeuchi, Tsutsumi, Kondo, Harada and T. Kajishima
"Heat transfer in natural convection with finite-sized particles considering thermal conductance due to inter-particle contacts"
Computational Thermal Sciences Vol.7, Issue 5-6 (2015) pp.385-404
DOI https://doi.org/10.1615/ComputThermalScien.2016014791
URL https://ir.library.osaka-u.ac.jp/repo/ouka/all/57199/ComputThermalScien_7_56_385.pdf
Interaction of elastic particles in a fluid
(MP4, 3.0MB)
(MP4, 2.9MB)Line contour: vorticity, Color contour: von Mises stress
S. Takeuchi, Y. Yuki, A. Ueyama and T. Kajishima
"A Conservative Momentum Exchange Algorithm for Interaction Problem between Fluid and Deformable Particles"
International Journal for Numerical Methods in Fluids Vol.64, Issue 10-12 (2010) pp.1084-1101
DOI https://doi.org/10.1002/fld.2272
URL https://ir.library.osaka-u.ac.jp/repo/ouka/all/57217/IntJNumF_64_1084.pdf
Interaction between a rising bubble and falling particles
(Bubble rising in particle suspension)
(MP4, 1.1MB)
(MP4, 1.1MB)
R. Iwata, S. Takeuchi and T. Kajishima
"Large Scale Analysis of Interactive Behaviors of Bubbles and Particles in a Liquid by a Coupled Immersed Boundary and VOF Technique"
Multiphase Science and Technology Vol.22(3), pp.233-246 (2010)
DOI https://doi.org/10.1615/MultScienTechn.v22.i3.40
URL https://ir.library.osaka-u.ac.jp/repo/ouka/all/57198/MultScienTechn_22_3_233.pdf
Lift-up of a submerged cylinder
(MP4, 130KB)
R. Iwata, S. Takeuchi and T. Kajishima
"Large Scale Analysis of Interactive Behaviors of Bubbles and Particles in a Liquid by a Coupled Immersed Boundary and VOF Technique"
Multiphase Science and Technology Vol.22(3), pp.233-246 (2010)
DOI https://doi.org/10.1615/MultScienTechn.v22.i3.40
URL https://ir.library.osaka-u.ac.jp/repo/ouka/all/57198/MultScienTechn_22_3_233.pdf
Elastic deformation of hydrofoil in a stationary fluid
(MPEG, 1.7MB)
E. Boujo, T.M.Y.S. Tuan Ya, S. Takeuchi and T. Kajishima
"Study of Fluid-Structure Interaction Problems Involving Deformable Objects by A New Finite Element - Immersed Boundary Approach"
Proc. The Third International Symposium on Aero Aqua Bio-Mechanics (ISABMEC2006), Jul 3-7, 2006, Okinawa, Japan, Paper No. 225
Turbulent cavitation in shear flow
(Cavitation region expands with decreasing the cavitation number σ)
Single phase (MPEG, 2.8MB)
σ=0.5 (MPEG, 2.8MB)
σ=0.3 (MPEG, 2.8MB)
K. Okabayashi, T. Kajishima
"DNS Analysis on Turbulence Modulation by Cavitation"
Trans. JSME Ser.B Vol.76, Issue 764 (2010) pp.570-579
DOI https://doi.org/10.1299/kikaib.76.764_570
Particle agglomerate process
(MPEG, 8.9MB)
Yukimoto, Kajishima, Takeuchi,
"Drag Model for Two-Dimensional String-Type Agglomerate of Micro Particles"
Trans. JSME Ser.B Vol.76-762, pp.203-210 (2010)
DOI https://doi.org/10.1299/kikaib.76.762_203
DNS Analysis of Fluid Force on a Solid Particle in Turbulence in a Homogeneous Domain
(MPEGv1, 2.5MB)
LES of the Flow around an Airfoil with Serrated Trailing Edge
(MPEGv1, 3.1MB)
Last modified: Wed MAR 11 2020