Papers - TAKAGI Youhei
about 39-
Numerical Prediction of the Buckling Risk of Oil Storage Tank under Tsunami Inundation
Y. Takagi, S. Numata, T. Hino
The 31st International Ocean and Polar Engineering Conference ISOPE-I-21-3 2021.6 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (international conference proceedings) Single Work
Other Link： https://onepetro.org/ISOPEIOPEC/proceedings-abstract/ISOPE21/All-ISOPE21/ISOPE-I-21-3198/464680
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Nishino Tomoaki, Takagi Youhei
INTERNATIONAL JOURNAL OF DISASTER RISK REDUCTION 42 101352 2020.1 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Elsevier Joint Work
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Y. Takagi, T. Hino, M. Nishimura, H. Aso
Proc. ASME-JSME-KSME Joint Fluids Engineering Conference 2019, 2019.7
Language：English Publishing type：Research paper (international conference proceedings) Publisher：AJKFLUIDS Joint Work
AJKFLUIDS2019-4746
Other Link： https://event.asme.org/AJKFluids/Program/#/AJKFLUIDS2019/sessions/167
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Effect of Thin and Rough Layers of Porous Materials on Drag
Petya Valentinova Stoyanova, Lei Wang, Atsushi Sekimoto, Yasunori Okano, Youhei Takagi
JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 52 ( 6 ) 493 - 500 2019.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：J-STAGE Joint Work
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2024S-GS26-4 Numerical Prediction of Flow around a Two-Dimensional Wing Using Reservoir Computing
Sumiyoshi Koya, Okada Kazuki, Takagi Youhei
Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 38 ( 0 ) 777 - 783 2024.5
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work
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Estimation of full-scale performance of energy-saving devices using Boundary Layer Similarity model
Sadakata, K; Hino, T; Takagi, Y
JOURNAL OF MARINE SCIENCE AND TECHNOLOGY 29 ( 2 ) 245 - 271 2024.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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2023A-GS17-1 Effect of turbulence stimulator in boundary layer flow on a flat plate at low Reynolds number
Takagi Youhei, Ichitsubo Kakeru
Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 37 ( 0 ) 647 - 650 2023.11
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work
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Numerical analysis of wake wash reduction for catamaran with hydrofoils
Terui Chota, Hino Takanori, Takagi Youhei
APPLIED OCEAN RESEARCH 135 2023.6 [Reviewed]
Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Numerical analysis of wake wash reduction for catamaran with hydrofoils
Terui Chota, Hino Takanori, Takagi Youhei
Applied Ocean Research 135 2023.4
Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Science Ltd. Joint Work
Catamarans are popular for fast sea transportation because of their high potential of speed and stability. However, the wake wash generated by catamarans often interfere surrounding environment. For the prevention of large waves generated by catamarans, a stern hydrofoil is known to be one of the effective devices. In the present study, the effect of hydrofoil attached at the stern of a catamaran for the wake wash reduction is investigated using CFD. The various configurations of a stern hydrofoil are designed and their performance are examined with respect to resistance in calm water and wave amplitudes. The computational domain is taken large enough to be able to analyze the wave field far downstream. In addition to the bare hull and the hull with foil cases, the bare hull cases with the attitudes fixed to those of the cases with the foil are simulated for the detailed analysis of foil effects. The inter-comparison of these cases makes it possible to separate the foil effects into the hull attitude change effect and the foil-generated wave effect. The wake wash reduction by stern foil system is achieved with the appropriate combination of hull attitude change and the interaction of hull waves and foil waves. Finally the design directions of a stern hydrofoil for the wake wash reduction are suggested.
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Ma Chengqian, Hino Takanori, Ma Ning, Takagi Youhei
OCEAN ENGINEERING 266 2022.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Ma Chengqian, Hino Takanori, Ma Ning, Takagi Youhei
Ocean Engineering 266 2022.11
Language：English Publishing type：Research paper (scientific journal) Publisher：Pergamon-Elsevier Science Ltd. Joint Work
To explore and predict the ship maneuverability in the regular and irregular waves, the zigzag tests, the turning tests, and the course-keeping tests for the model-scale S175 containership under various wave conditions are simulated. The simulations are performed using a structured overset Unsteady Reynolds Averaged Navier-Stokes (URANS) solver with a moving grid. A body force method is adopted to predict the propeller forces. The simulation results are validated by the free-running experiments with satisfactory accuracy, which indicates that the present simulation strategy is effective and reliable. The hydrodynamic loads on the hull and the rudder together with the ship motion characteristics during the maneuvers in waves are obtained. It is concluded that the ship motions and hydrodynamic loads increase with the increase of the wavelength when the wave height is kept constant. The variation trends and magnitudes for low-frequency components of the self-propulsion factors in waves are similar to those in the calm water condition except obvious high-frequency fluctuations due to the wave effect. For the zigzag tests under the long-crested and short-crested irregular waves, the time histories of the yaw and rudder angle are similar. For the turning tests, the amplitude of roll motion in waves is much larger compared with that of the zigzag tests under the same wave condition, and the drift of the trajectory due to the wave is obvious. The current course keeping simulation can be an alternative tool to predict course keeping maneuvers in waves. Furthermore, flow visualizations are presented for providing a better understanding of the wave effect on free-running ship maneuvers.
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Modification of k-omega turbulence model for ship resistance flow predictions
Hino Takanori, Suzuki Kengo, Takagi Youhei
JOURNAL OF OCEAN ENGINEERING AND MARINE ENERGY 8 ( 4 ) 527 - 538 2022.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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2021S-GS2-3 CFD Simulation of Breaking Bow Waves (2nd Report)
Hino Takanori, Mizuide Masahiro, Takagi Youhei
Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 32 ( 0 ) 275 - 278 2021.5
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work
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2020A-GS18-1 CFD Simulation of Breaking Bow Waves
Mizuide Masahiro, Hino Takanori, Takagi Yohei
Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 31 ( 0 ) 395 - 400 2020.11
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work
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Hydrodynamic design of energy saving device for ship scale performance improvement
H. Ikenoue, T. Hino, Y. Takagi
Proceedings of the 33rd Symposium on Naval Hydrodynamics 2020.10
Language：English Publishing type：Research paper (international conference proceedings) Joint Work
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2020S-GS11-9 Parameter Tuning of k-! Turbulence Model for Ship Flow Simulation
Hino Takanori, Suzuki Kengo, Xu Hui, Takagi Youhei
日本船舶海洋工学会講演会論文集 30 ( 0 ) 545 - 549 2020
Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人 日本船舶海洋工学会 Joint Work
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Numerical analysis of single oil tank behavior under tsunami inundation by using fluid structure interaction
Y. Takagi, Y. Kawamura, T. Hino
Proceedings of the 13th International Seminar of Port-city Universities League 2019.10
Language：English Publishing type：Research paper (international conference proceedings) Publisher：YNU PRESS Joint Work
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CFD Simulations of Breaking Stokes Waves
T. Hino, H. Ikenoue, Y. Takagi
Proc. OMAE2019 Conference 2019.6
Language：English Publishing type：Research paper (international conference proceedings) Publisher：OMAE Joint Work
OMAE2019‑95946,
Other Link： https://event.asme.org/Events/media/library/resources/omae/OMAE-2019-Program.pdf
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Y. Takagi, R. Tazawa, T. Hino, Y. Kawamura
The 29th International Ocean and Polar Engineering Conference 2019.6
Language：English Publishing type：Research paper (international conference proceedings) Publisher： ISOPE Joint Work
ISOPE-I-19-407
Other Link： https://onepetro.org/conference-paper/ISOPE-I-19-407
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Suzuki Hiroyoshi, Takagi Youhei
Journal of Japan Society for Safety Enginennring 58 ( 1 ) 16 - 22 2019.2
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Soceiety for Safety Engineering Joint Work
Other Link： https://ci.nii.ac.jp/naid/130007592876
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EXPERIMENTAL STUDY ON THE FRICTION DRAG REDUCTION OF HYDROGEL PAINT IN A BOUNDARY LAYER ON FLAT PLATE
Takagi Youhei, Hino Takanori, Nishimura Masanari, Aso Hiromi
PROCEEDINGE OF THE ASME/JSME/KSME JOINT FLUIDS ENGINEERING CONFERENCE, 2019, VOL 1 2019 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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CFD SIMULATIONS OF BREAKING STOKES WAVES
Hino Takanori, Ikenoue Harushi, Takagi Youhei
PROCEEDINGS OF THE ASME 38TH INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING, 2019, VOL 9 2019 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Numerical Prediction of the Oil Spill Triggered from Tsunami at the Japan Coastal Area with Chemical Complex
Proceedings of The 12th International Seminar of Port-city Universities League 76 - 80 2018.10
Language：English Publishing type：Research paper (international conference proceedings) Single Work
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Experimental and numerical analysis of tsunami triggered oil spill from storage tanks
W. P. Kyaw, J. Liu, Y. Takagi, H. Suzuki and N. Kato
The Twenty-seventh (2017) International Ocean and Polar Engineering Conference (ISOPE-2017) 2017.6
Language：English Publishing type：Research paper (international conference proceedings) Joint Work
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Numerical analysis of tsunami-triggered oil spill from industrial parks in Osaka Bay
Wai Phyo Kyaw,Michiaki Sugiyama,Yohei Takagi,Hiroyoshi Suzuki,Naomi Kato
ScienceDirect 50 325 - 336 2017.4 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Joint Work
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Numerical simulation of methane seeping from the seabed in the Japan Sea
Y. Takagi, S. Kawahara, Y. Okano and N. Kato
Journal of Chemical Engineering of Japan 50 ( 4 ) 244 - 253 2017.4 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：SOC CHEMICAL ENG JAPAN Joint Work
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A Numerical Study on the Dissolution Process of InGaSb under Zero Gravity
International Journal of Microgravity Science and Application 2017.4 [Reviewed]
Language：English Publishing type：Research paper (scientific journal)
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A numerical simulation model by volume averaging for the dissolution process of GaSb into InSb in a sandwich system
T. Yamamoto, H. Mirsandi, X. Jin, Y. Takagi, Y. Okano, Y. Inatomi, Y. Hayakawa and S. Dost
Numerical Heat Transfer, Part B: Fundamentals 70 ( 5 ) 441 - 458 2016.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：TAYLOR & FRANCIS INC Joint Work
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Numerical investigation of oscillatory thermocapillary flows under zero gravity in a circular liquid film with concave free surface
T. Yamamoto, Y. Takagi, Y. Okano and S. Dost
Physics of Fluids 28 ( 3 ) 032106 2016.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：AMER INST PHYSICS Joint Work
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Numerical investigation of the effect of free surface shape on the direction of thermocapillary flow in a thin circular pool
T. Yamamoto, Y. Takagi, Y. Okano and S. Dost
Journal of Chemical Engineering of Japan 48 ( 6 ) 407 - 417 2015.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：SOC CHEMICAL ENG JAPAN Joint Work
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A numerical study on the growth process of InGaSb crystals under microgravity with interfacial kinetics
H. Mirsandi, T. Yamamoto, Y. Takagi, Y. Okano, Y. Inatomi, Y. Hayakawa and S. Dost
Microgravity Science and Technology 27 ( 5 ) 313 - 320 2015.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER Joint Work
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A three-dimensional simulation of thermocapillary flow in a circular thin liquid film under zero gravity
T. Yamamoto, Y. Takagi, Y. Okano, and S. Dost
Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan 12 Pe_19 - Pe_27 2014.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Combined effect of crucible rotation and magnetic field on hydrothermal wave
Y. Takagi, Y. Okano, H. Minakuchi and S. Dost
Journal of Crystal Growth 385 72 - 76 2014.1 [Reviewed]
Language：English Publishing type：Research paper (international conference proceedings) Publisher：ELSEVIER Joint Work
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The relative contributions of thermo-solutal Marangoni convections on flow patterns in a liquid bridge
H. Minakuchi, Y. Takagi, Y. Okano, S. Gima and S. Dost
Journal of Crystal Growth 385 61 - 65 2014.1 [Reviewed]
Language：English Publishing type：Research paper (international conference proceedings) Publisher：ELSEVIER Joint Work
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Numerical simulation of InGaSb crystal growth by temperature gradient method under normal- and micro-gravity fields
M. Nobeoka, Y. Takagi, Y. Okano, Y. Hayakawa and S. Dost
Journal of Crystal Growth 385 66 - 71 2014.1 [Reviewed]
Language：English Publishing type：Research paper (international conference proceedings) Publisher：ELSEVIER Joint Work
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Numerical investigation for the effect of the liquid film volume on thermocapillary flow direction in a thin circular liquid film
T. Yamamoto, Y. Takagi, Y. Okano and S. Dost
Physics of Fluids 25 ( 8 ) 082108 2013.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：AMER INST PHYSICS Joint Work
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Three-dimensional numerical simulation of thermal and solutal Marangoni convection in a liquid bridge under zero-gravity field
H. Minakuchi, Y. Takagi, Y. Okano, T. Nosoko, S. Gima and S. Dost
Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan 10 Ph_15 - Ph_20 2012.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Numerical and physical experiments on drag torque in a wet clutch
Y. Takagi, Y. Okano, M. Miyagawa and N. Katayama
Tribology Online 7 ( 4 ) 242 - 248 2012.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Numerical simulation of the dissolution process of GaSb into InSb melt under normal and microgravity conditions
Y. Takagi, N. Suzuki, Y. Okano, A. Tanaka, Y. Hayakawa and S. Dost
Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan 10 Ph_1 - Ph_7 2012.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work