Publication (2001- )

Journal articles

2010

• Yokota, R. and Obi, S., Comparing vortex methods and finite difference methods in a homogeneous shear flow, Int. J. for Numerical Methods in Fluids, 63-7, 828-846, 2010. doi:10.1002/fld.2102
• Naka, Y., Tsuboi, K., Kametani, Y., Fukagata, K. and Obi, S., Near-field development of a turbulent mixing layer periodically forced by a bimorph PVDF film actuator, Journal of Fluid Science and Technology, 5, 2, 156-168, 2010.

2009

• Yokota, R., Narumi, T., Sakamaki, R., Kameoka, S., Obi, S., Yasuoka, K., Fast Multipole Methods on a Cluster of GPUs for the Meshless Simulation of Turbulence, Computer Physics Communications, 180-11, 2066-2078, 2009. doi:10.1016/j.cpc.2009.06.009
• Naka, Y., Obi, S., Velocity-pressure correlation measurements in complex free shear flows, Int. J. Heat Fluid Flow, 30, 3, 411-420, 2009. doi:10.1016/j.ijheatfluidflow.2009.01.002
• Naka, Y., Azegami, S., Kawata, T., Fukagata, K. and Obi, S., 2009, Simultaneous measurement of velocity and pressure in a wing-tip vortex, Journal of Fluid Science and Technology, Vol. 4, No. 1, 107-115.

2008

• J.-F. Qiu, S. Obi and T. B. Gatski, On the weak-equilibrium condition for derivation of algebraic heat flux model, Int. J. Heat and Fluid Flow, 29, 6, 1628-1637, 2008
• J.-F. Qiu, S. Obi and T. B. Gatski, Evaluation of Extended Weak-Equilibrium Conditions for Fully Developed Rotating Channel Flow, Flow, Turbulence and Combustion, 80, 4, 435-454, 2008DoI:07/s10494-008-9132-8
• Sheel, T. K., Yokota, R., Yasuoka, K., and Obi, S., The study of colliding vortex rings using a special-purpose computer and FMM, Transactions of the Japan Society for Computational Engineering and Science, 20080003, 2008.

2007

• Kanagai, S., Suzuki, J., Obi, S. and Masuda, S., Flow instability and disk vibration of shrouded corotating disk sytem, Trans. ASME, Journal of Fluids Engineering, 129-10, 1306-1313, 2007. doi:10.1115/1.2776958
• Yokota, R., Sheel, T. K. and Obi, S., Calculation of isotropic turbulence using a pure Lagrangian vortex method, Journal of Computational Physics, 226-2, 1589-1606, 2007. doi:10.1016/j.jcp.2007.06.003
• Sheel, T. K., Yasuoka, K., and Obi, S., Fast vortex method calculation using a special-purpose computer; Computers and Fluids, 36-8, 1319-1326, 2007. doi:10.1016/j.compfluid.2007.01.006
• Totsuka, Y. and Obi, S., A Validation of Viscous Dissipation Models for Fast Vortex Methods in Simulations of Decaying Turbulence, Journal of Fluid Science and Technology, 2-1, 248-257, 2007.

2006

• Nagata, T., Obi, S., Masuda, S., 2006. Statistics of velocity field in laboratory-simulated downburst, AIAA J., 44, 2061-2070
• Obi, S., Tokai, N., 2006. The pressure-velocity correlation in oscillatory turbulent flow between a pair of bluff bodies, International Journal of Heat and Fluid Flow, 27, 768-776
• Naka, Y., Omori, T., Obi, S., Masuda, S., 2006. Simultaneous measurements of fluctuating velocity and pressure in a turbulent mixing layer, International Journal of Heat and Fluid Flow, 27, 737-746.doi:10.1016/j.ijheatfluidflow.2006.02.023

2004

• Minagawa, Y., Obi, S., 2004. Development of turbulent impinging jet on a rotating disk. International Journal of Heat and Fluid Flow, 25, 759-766

2002

• Fukaya, R., Obi, S., Masuda, S., Tokuyama, M., 2002. Flow instability and elastic vibration of shrouded corotating disk systems, Experiments in Fluids, 33, 369-373
• Yamawaki, D., Obi, S., Masuda, S., 2002. Heat transfer in transitional and turbulent boundary layers with system rotation, 23, 186-193

2001

• Yoshioka, S., Obi, S., Masuda, S., 2001. Turbulence statistics of periodically pertubed separated flow over backward-facing step. International Journal of Heat and Fluid Flow, 22, 393-401
• Yoshioka, S., Obi, S., Masuda, S., 2001. Organized vortex motion in periodically perturbed turbulent separated flow over a backward-facing step. International Journal of Heat and Fluid Flow, 22, 302-307

Conference Proceedings

2010

• Kurashima, D., Naka, Y., Fukagata, K, Obi, S., Aerodynamics of a hard disk drive: Measurements of flow velocity, pressure fluctuation and disk vibration, 8th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements (ETMM8), Marseille, France, 9-11 June 2010.

2009

• Kawata, T., Naka, Y., Fukagata, K, Obi, S., Simultaneous measurement of three velocity components and pressure fluctuation in a turbulent wing-tip vortex, 6th International Symposium on Turbulence, Heat and Mass Transfer (THMT-6), Italy, September, 2009.
• Yokota, R., Fukagata, K. and Obi, S., Lagrangian Vortex Methods in Turbulent Channel Flows, 12th EUROMECH European Turbulence Conference, Germany, September, 2009
• Yokota, R., Narumi, T., Sakamaki, R., Yasuoka, K. and Obi, S., Fast Multipole Methods on GPUs for the Meshfree Simulation of Turbulence, 10th US National Congress on Computational Mechanics, USA, July, 2009.
• Yokota, R., Narumi, T., Sakamaki, R., Kameoka, S., Yasuoka, K. and Obi, S., DNS of Homogeneous Turbulence Using Vortex Methods Accelerated by the FMM on a Cluster of GPUs, 21st International Conference on Parallel Compuational Fluid Dynamics, USA, May, 2009.

2008

• Naka, Y. and Obi, S., Velocity-pressure correlation measurements in complex free shear flows, ETMM-7, Cyprus, June, 2007
• Hui, J. and Obi, S., A modification of the elliptic relaxation equation to account for pressure transport in RANS modeling, ETMM-7, Cyprus, June, 2007
• Yokota, R. and Obi, S. Direct numerical simulation of homogeneous shear flow using vortex methods, 4th International Conference on Vortex Flows and Vortex Models, Seoul, Korea, April, 2008
• Sheel, T. K., Yokota, R., Yasuoka, K., and Obi, S., Calculation of the decay of colliding turbulent vortex rings, 4th International Conference on Vortex Flows and Vortex Models, Seoul, Korea, April, 2008.

2007

• Qiu, J. -F. and Obi, S., Evaluation of Weak Equilibrium Assumption for AHFM in Calculation of Rotating Channel Flow, The Asian Symposium on Computational Heat Transfer and Fluid Flow 07, China, October, 2007.
• Yokota, R. and Obi, S., Pure Lagrangian vortex methods for the simulation of decaying isotropic turbulence, Proc. TSFP-5, Garching, Germany, Aug. 28, 2007.
• Naka, Y., Obi, S., and Masuda, S., Development of a miniature probe for velocity-pressure correlation measurement, Proc. TSFP-5, Garching, Germany, Aug. 28, 2007. 619-624.
• Qiu, J. -F. and Obi, S., Validation of Extended Weak-Equilibrium Condition for Fully Developed Rotating Channel Flow, Proc. TSFP-5, Garching, Germany, Aug. 28, 2007.
• Sato, S. and Obi, S., Turbulent structure and relaminalization of a rotating turbulent channel flow at high rotation number, Proc. of 2007 ASME-JSME Thermal Engineering Summer Heat Transfer Conference, ASME, Vancouver, 2007/07.
• T. K. Sheel, K. Yasuoka, and S. Obi; Acceleration of Vortex Method Calculation using a special-purpose computer and FMM; CDROM, ICCM2007, Hiroshima, Japan, 2007.

2006

• Naka, Y., Obi, S. and Masuda, S. 2006 Measurement of velocity-pressure correlation in a free shear flow. Euromech Fluid Mechanics Conference-6.
• Yokota, R., Obi, S., 2006. Vortex Flow Simulation Between Multiple Bridge Decks, Whither Turbulence Prediction and Control, Korea, 128-129

2005

• Yokota, R., Obi, S., 2005. Vortex flow simulation of multiple bluff bodies,3rd International Conference on Vortex Flows and Vortex Models, Yokohama, 191-196
• Arizono, T., Masuda, S., Obi, S., 2005. Numerical simulation of vortex ring with density difference, 3rd International Conference on Vortex Flows and Vortex Models, Yokohama, 269-274
• Sheel, T., K., Yasuoka, K., Obi, S., 2005. Acceleration of vortex method calculation using MDGRAPE-2: a special purpose computer, 3rd International Conference on Vortex Flows and Vortex Models, Yokohama, 137-142
• Tokai, N., Obi, S., 2005. Oscillatory turbulent flow around a pair of square cylinder in tandem, Int. Conf. on Jets, Wakes and Separated Flows, Toba-shi, Mie, 527-532
• Naka, Y., Omori, Y., Obi, S., Masuda, S., 2005. Experimental study on velocity-pressure correlation in turbulent mixing layer out of equilibrium state, 4th International Symposium on Turbulent Shear Flow Phenomena, Williamsberg, VA, 1125-1130
• Obi, S., Tokai, N, Sakai, K., 2005. The role of pressure-velocity correlation in oscillatory flow between a pair of bluff bodies, ERCOFTAC International Symposium on Engineering Turbulence Modelling and Measurements, Sardinia, 481-490

2004

• Totsuka, Y., Obi, S., 2004. The vortex method applied to simulation of homogeneous isotropic turbulence, International Conference on Computational Methods, Singapore
• Yamamoto, W., Obi, S., Masuda, S., 2004. Effect of disk-shroud spacing on flow induced vibration in corotating disk, ASME Information Storage and Processing Systems Conference, Santa Clara, CA

2003

• Obi, S., Kominami, H., Nakajima, T., 2003. Indirect measurement of slip-velocity between solid wall and gas flow at high Knudsen numbers, The International Symposium on Micro-Mechanical Engineering, 339-343
• Ichikawa, M., Obi, S., Masuda, S., 2003. Second-moment turbulence closure in prediction of channel flow with system rotation, International Gasturbine Conference, Tokyo
• Omori, T., Obi, S., Masuda, S., 2003. Experimental study on velocity-pressure correlation in turbulent mixing layer, 4th Int. Symp. Turbulence, Heat and Mass transfer, Antalya, Turkey, 253-260
• Minagawa, Y., Obi, S., 2003. Turbulent Impinging Jet Onto a Co-axial Rotating Disk, 4th Int. Symp. Turbulence, Heat and Mass transfer, Antalya，Turkey, 755-762
• Nagata, T., Iyama, K., Obi, S., Masuda, S., 2003. Statistical Characteristics of vertical gravitational flow impinging onto horizontal ground, 4th Int. Symp. Turbulence, Heat and Mass transfer, Antalya, Turkey, 829-836
• Masuda, S., Takagi, R., Okada, K., Obi, S., 2003. Asymmetry and unsteadiness of incipient separation of nominally axisymmetric turbulent boundary layer, 4th ASME-JSME Joint Fluids Engineering Conference, Honolulu, Hawaii
• Shirai, K., Tsuru, K., Obi, S., 2003. Performance prediction for optical wall shear stress sensor using direct numerical simulation of fluid flow, 4th ASME-JSME Joint Fluids Engineering Conference, Honolulu, Hawaii
• Obi, S., 2003. On the correlation between instantaneous velocity and pressure-gradient in large-scale turbulence, 4th ASME-JSME Joint Fluids Engineering Conference, Honolulu, Hawaii
• Shirai, K., Tsuru, K., Obi, S., 2003. Novel measurement method for local wall shear stress in high Reynolds number flows by utilizing Fresnel's biprism, 3rd Int. Symp. Turbulent Shear Flow Phenomena, Sendai, 483-488
• Kisaki, S., Yamamoto, W., Obi, S., Masuda, S., 2003. Flow induced vibration of shrouded corotating disk systems in subcritical speed range, 2003 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment, Yokohama, 203-204

2002

• Sakai, K., Maeda, T., Obi, S., 2002. Evaluation of the pressure-velocity correlation in turbulent wake of a rectangular cylinder, 5th JSME-KSME Fluids Engineering Conference, Nagoya
• Shirai, K., Obi, S., Masuda, S., 2002. Measurement of wall shear stress by extended laser-Doppler method using dual spherical waves, The 11th Int. Symp. Appl. Laser Tech. Fluid Mechanics, Lisbon
• Totsuka, Y., Obi, S. 2001. Analysis of the homogeneous isotropic turbulence by a three dimensional vortex element method, Int. Conf. Vortex Methods, Istanbul, Turkey, 71-78

2001

• Kouno, T., Obi, S, Masuda, S., 2001. DNS study on the measurement of turbulent wall shear stress using surface-mounted hot-film sensor, 2nd Int. Symp. Turbulent Shear Flow Phenomena, Stockholm, 141-146
• Nagata, T., Obi, S., Masuda, S., 2001. The vortex ring impinging onto a ground surface, 2nd Int. Symp. Turbulent Shear Flow Phenomena, Stockholm, 283-288