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Journal Articles

Effect of a Short, Bio-Mimetic Control Device on Aerodynamic Drag of Ahmed Body

The Hung Tran, Masato Hijikuro, Masayuki Anyoji, Takanori Uchida, Takuji Nakashima, Keigo Shimizu
Journal: Journal of Fluids Engineering
Article Type: Research-Article
J. Fluids Eng. March 2023, 145(3): 031206.
Paper No: FE-22-1422
DOI: https://doi.org/10.1115/1.4056341
Published Online: December 22, 2022
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Topics: Drag (Fluid dynamics), Flow (Dynamics), Pressure, Separation (Technology), Skin friction (Fluid dynamics), Vortices, Bubbles, Reynolds number, Biomimetics, Wind tunnels
Journal Articles

Experimental Study of the Skin-Friction Topology Around the Ahmed Body in Cross-Wind Conditions

The Hung Tran, Masayuki Anyoji, Takuji Nakashima, Keigo Shimizu, Anh Dinh Le
Journal: Journal of Fluids Engineering
Article Type: Research-Article
J. Fluids Eng. March 2022, 144(3): 031209.
Paper No: FE-21-1328
DOI: https://doi.org/10.1115/1.4052418
Published Online: October 14, 2021
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Topics: Flow (Dynamics), Skin friction (Fluid dynamics), Topology, Yaw
Proceedings Papers

Numerical Recreation of the Draupner Wave in Crossing Wave Systems Using Smoothed Particle Hydrodynamics

Taiga Kanehira, Mark L. McAllister, Samuel Draycott, Takuji Nakashima, Naokazu Taniguchi, Yasuaki Doi, David Ingram, Ton S. van den Bremer, Hidemi Mutsuda
Proc. ASME. OMAE2020, Volume 8: CFD and FSI, V008T08A012, August 3–7, 2020
Paper No: OMAE2020-18359
DOI: https://doi.org/10.1115/OMAE2020-18359
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Topics: Hydrodynamics, Particulate matter, Waves, Damage, Errors, Fluids, Geometry, Kinematics, Navier-Stokes equations, Oceans
Proceedings Papers

Experimental Investigation for the Better Control of Flows Over a Simplified Vehicle Configuration With Dielectric Barrier Discharge Plasma Actuator

Satoshi Sekimoto, Keigo Shimizu, Takuji Nakashima, Kozo Fujii, Takenori Hiraoka, Takahide Nouzawa
Proc. ASME. AJKFluids2019, Volume 1: Fluid Mechanics, V001T01A005, July 28–August 1, 2019
Paper No: AJKFluids2019-5121
DOI: https://doi.org/10.1115/AJKFluids2019-5121
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Topics: Actuators, Drag reduction, Flow (Dynamics), Flow control, Plasmas (Ionized gases), Vehicles
Proceedings Papers

Wake Flow Visualization of a Simplified Vehicle Model During Flow State Change

Takuji Nakashima, Takashi Moriuchi, Yan Chao, Itsuhei Kohri
Proc. ASME. AJKFluids2019, Volume 3A: Fluid Applications and Systems, V03AT03A006, July 28–August 1, 2019
Paper No: AJKFluids2019-5404
DOI: https://doi.org/10.1115/AJKFluids2019-5404
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Topics: Flow (Dynamics), Vehicles, Visualization, Wakes, Drag (Fluid dynamics), Aerodynamics, Automobiles, Delays, Fluid measurement, Fluid-dynamic forces
Proceedings Papers

Aerodynamic Characteristics of a Road Vehicle in Steady-State Cornering

Takuji Nakashima, Makoto Tsubokura, Yoshihiro Okada, Takahide Nouzawa, Ryosuke Kono, Yasuaki Doi
Proc. ASME. AJKFluids2015, Volume 1A: Symposia, Part 2, V01AT17A002, July 26–31, 2015
Paper No: AJKFluids2015-17553
DOI: https://doi.org/10.1115/AJKFluids2015-17553
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Topics: Motor vehicles, Steady state, Fluids, Vehicles, Yaw, Aerodynamics, Centripetal force, Computer simulation, Model basin, Pressure
Proceedings Papers

A Numerical Analysis of Unsteady Aerodynamics of Road Vehicle During Lane-Change Maneuvering

Jun Ikeda, Makoto Tsubokura, Yusuke Nakae, Takuji Nakashima, Jun Yamamura, Hiroshi Tanaka, Tsuyoshi Yasuki
Proc. ASME. FEDSM2013, Volume 1C, Symposia: Gas-Liquid Two-Phase Flows; Industrial and Environmental Applications of Fluid Mechanics; Issues and Perspectives in Automotive Flows; Liquid-Solids Flows; Multiscale Methods for Multiphase Flow; Noninvasive Measurements in Single and Multiphase Flows; Numerical Methods for Multiphase Flow; Transport Phenomena in Energy Conversion From Clean and Sustainable Resources; Transport Phenomena in Materials Processing and Manufacturing Processes; Transport Phenomena in Mixing; Turbulent Flows: Issues and Perspectives, V01CT19A004, July 7–11, 2013
Paper No: FEDSM2013-16447
DOI: https://doi.org/10.1115/FEDSM2013-16447
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Topics: Aerodynamics, Motor vehicles, Numerical analysis, Vehicles, Flow (Dynamics), Transients (Dynamics), Large eddy simulation, Pressure, Roads, Stability
Proceedings Papers

Unsteady Aerodynamics Simulation of a Heavy-Duty Truck in Wind Gusts Coupled With Vehicle Motion Analysis in Six Degrees of Freedom

Takuji Nakashima, Makoto Tsubokura, Syumei Matsuda, Yasuaki Doi
Proc. ASME. AJK2011, ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D, 1013-1024, July 24–29, 2011
Paper No: AJK2011-23031
DOI: https://doi.org/10.1115/AJK2011-23031
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Topics: Aerodynamics, Degrees of freedom, Simulation, Trucks, Vehicles, Wind, Dynamics (Mechanics), Tires, Vehicle dynamics, Containers
Proceedings Papers

Large Eddy Simulation on the Unsteady Aerodynamics of a Heavy Duty Truck in Wind Gust

Makoto Tsubokura, Prasanjit Das, Tomofuyu Matsuuki, Takuji Nakashima
Proc. ASME. AJK2011, ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D, 1033-1041, July 24–29, 2011
Paper No: AJK2011-23034
DOI: https://doi.org/10.1115/AJK2011-23034
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Topics: Aerodynamics, Large eddy simulation, Trucks, Wind, Flow (Dynamics), Drag (Fluid dynamics), Numerical analysis, Vehicles, Wavelength, Wind tunnels
Proceedings Papers

Large-Eddy Simulation on the Effect of Ambient Perturbation on Vehicle Aerodynamics

Makoto Tsubokura, Yuki Ikawa, Masashi Kitayama, Takuji Nakashima
Proc. ASME. FEDSM2010, ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 1, Symposia – Parts A, B, and C, 2623-2632, August 1–5, 2010
Paper No: FEDSM-ICNMM2010-30570
DOI: https://doi.org/10.1115/FEDSM-ICNMM2010-30570
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Topics: Aerodynamics, Large eddy simulation, Vehicles, Transients (Dynamics), Wind tunnels, Finite volume methods, Motor vehicles, Pressure, Turbulence, Wind
Proceedings Papers

Coupled Analysis of Unsteady Aerodynamics and Vehicle Motion of a Heavy Duty Truck in Wind Gusts

Takuji Nakashima, Makoto Tsubokura, Takeshi Ikenaga, Kozo Kitoh, Yasuaki Doi
Proc. ASME. FEDSM2010, ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 1, Symposia – Parts A, B, and C, 2659-2668, August 1–5, 2010
Paper No: FEDSM-ICNMM2010-30646
DOI: https://doi.org/10.1115/FEDSM-ICNMM2010-30646
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Topics: Aerodynamics, Trucks, Vehicles, Wind, Simulation, Vehicle dynamics, Equations of motion, Transients (Dynamics), Unsteady flow, Yaw
Proceedings Papers

A Basic Study on Wind Pressure Characteristics of a Trimaran PCC

Yasunori Nihei, Qiao Li, Takuji Nakashima, Yoshiho Ikeda
Proc. ASME. OMAE2010, 29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 4, 311-318, June 6–11, 2010
Paper No: OMAE2010-20537
DOI: https://doi.org/10.1115/OMAE2010-20537
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Topics: Wind pressure, Hull, Wind, Breakwaters, Computational fluid dynamics, Fans, Flow (Dynamics), Marine transportation, Model basin, Seas
Proceedings Papers

Large Eddy Simulation of a Gas-Turbine Combustor Using 2-Scalar Flamelet Approach

Takuji Nakashima, Nobuyuki Oshima
Proc. ASME. FEDSM2007, Volume 1: Symposia, Parts A and B, 1321-1328, July 30–August 2, 2007
Paper No: FEDSM2007-37225
DOI: https://doi.org/10.1115/FEDSM2007-37225
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Topics: Combustion chambers, Gas turbines, Large eddy simulation, Scalars, Combustion, Turbulence, Computer simulation, Flow (Dynamics), Geometry, Modeling
Proceedings Papers

Current Status on High Performance Computing for Vehicle Aerodynamics Using Large Eddy Simulation

Makoto Tsubokura, Takuji Nakashima, Nobuyuki Oshima, Kozo Kitoh, Huilai Zhang, Keiji Onishi, Toshio Kobayashi
Proc. ASME. FEDSM2007, Volume 2: Fora, Parts A and B, 1191-1197, July 30–August 2, 2007
Paper No: FEDSM2007-37456
DOI: https://doi.org/10.1115/FEDSM2007-37456
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Topics: Aerodynamics, Large eddy simulation, Vehicles, Engineering simulation, Flow (Dynamics), Simulation, Turbulence, Wind tunnels