JAMSTEC > CEIST > ESRG > ONISHI, Ryo
[ Japanese ]

Ryo ONISHI (Dr. Eng)


Research Interest

turbulent flows, cloud microphysics, cloud turbulence, multiphase flows

Research Career


Apr 2014-present

Senior Researcher
Group Leader of Earth Simulation Research Group,
Center for Earth Information Science and Technology, JAMSTEC

Nov 2005-Mar 2014

Researcher
Earth Simulator Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)

Apr 2011-Mar 2013

JSPS Postdoc Fellow for Research Abroad
Dept. Aeronautics, Imperial College London

Apr 2005-Oct 2005

NIES Postdoc Researcher
Center for Global Environmental Research (CGER), National Institute for Environmental Studies (NIES)

Mar 2005

ph D. in Faculty of Engineering (Doctor of Engineering), Kyoto University

Thesis title:Numerical Simulations of Chemical Reaction and Droplet Growth in Environmental Turbulent Flows


Award

Jun. 2015,
Graphics Award, in the 20th JSCES symposium (First author:S. Kawahara)

Feb. 2014,
Japan Society of Fluid Mechanics, the Ryumon Award (a young scientist award)

Dec. 2012,
Best CFD Graphics Award, in the 26th CFD symposium (First author:K. Matsuda) (Link)

July 2012,
Japan Association for Computational Mechanics, The JACM Young Investigator Award

Dec. 2009,
Best CFD Graphics Award, in the 23th CFD symposium（Link）

Apr. 2009,
The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology, The Young Scientists' Prize

Apr. 2008,
Japan Society of Mechanical Engineering, Encouraging Prize (Research)


Research Result

peer-reviewed papers (Data at June 2018)

  1. T. Watanabe, J.J. Riley, K. Nagata, R. Onishi and K. Matsuda, A localized turbulent mixing layer in a uniformly stratified environment, Journal of Fluid Mechanics, 849, pp.245-276 (2018)
  2. K. Matsuda and R. Onishi, Turbulent enhancement of radar reflectivity factor for polydisperse cloud droplets, Atmos. Chem. Phys. Disscus., https://doi.org/10.5194/acp-2018-480.
  3. Y. Kunishima and R. Onishi, Direct Lagrangian tracking simulation of droplet growth in vertically developing cloud, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-328.
  4. S. Komori, K. Iwano, N. Takagaki, R. Onishi, R. Kurose, K. Takahashi, N. Suzuki, Laboratory Measurements of Heat Transfer and Drag Coefficients at Extremely High Wind Speeds, Journal of Physical Oceanography, 48, pp.959-974 (2018)
  5. K. Matsuda, R. Onishi and K. Takahashi, Tree-crown-resolving large-eddy simulation coupled with three-dimensional radiative transfer model, Journal of Wind Engineering and Industrial Aerodynamics, 173, pp.53-66 (2018)
  6. R. Onishi and D. Sugiyama, Deep Convolutional Neural Network for Cloud Coverage Estimation from Snapshot Camera Images, SOLA, 13, pp.235-239 (2017)
  7. M. Nakano, A. Wada, M. Sawada, H. Yoshimura, R. Onishi, S. Kawahara, W. Sasaki, T. Nasuno, M. Yamaguchi, T. Iriguchi, M. Sugi and Y. Takeuchi, Global 7-km mesh nonhydrostatic Model Intercomparison Project for improving TYphoon forecast (TYMIP-G7): Experimental design and preliminary results, Geoscientific Model Development, 10, pp.1363-1381 (2017)
  8. K. Matsuda, R. Onishi and K. Takahashi, Influence of gravitational settling on turbulent droplet clustering and radar reflectivity factor, Flow, Turbulence and Combustion, 98, pp.327-340 (2017)
  9. W. Sasaki, R. Onishi, H. Fuchigami, K. Goto, S. Nishikawa, Y. Ishikawa and K. Takahashi, MJO simulation in a cloud-system-resolving ocean-atmosphere coupled model. Geophysical Research Letters, 43, 17, pp.9352-9360 (2016)
  10. R. Onishi, H. Fuchigami, K. Matsuda and K. Takahashi, Detailed Cloud Microphysics Simulation for Investigation into the Impact of Sea Spray on Air Sea Heat Flux, Flow Turbulence and Combustion, 97, pp.1111-1125 (2016)
  11. R. Onishi and A. Seifert, Reynolds-number dependence of turbulence enhancement on collision growth. Atmospheric Chemistry and Physics, 16, pp.12441-12455 (2016)
  12. A. Seifert and R. Onishi, Turbulence effects on warm-rain formation in precipitating shallow convection revisited, Atmospheric Chemistry and Physics, 16, pp.12127-12141 (2016)
  13. K. Yokoi, R. Onishi, X.-L. Deng, M. Sussman. Density-scaled balanced continuum surface force model with a level set based curvature interpolation technique, International Journal of Computational Methods, 13, 1641004 (2016)
  14. R. Onishi, K. Matsuda and K. Takahashi, Lagrangian Tracking Simulation of Droplet Growth in Turbulence - Turbulence Enhancement of Autoconversion Rate, Journal of the Atmospheric Sciences, 72, pp.2591-2607 (2015)
  15. L.-F. Lu, R. Onishi and K. Takahashi, The effect of wind on long-term summer water temperature trends in Tokyo Bay, Japan, Ocean Dynamics, 65, pp.919-930 (2015)
  16. P. C. Valente, R. Onishi, and C. B. da Silva, Origin of the imbalance between energy cascade and dissipation in turbulence, Physical Review E, 90, 023003 (2014)
  17. K. Matsuda, R. Onishi, M. Hirahara, R. Kurose, K. Takahashi and S. Komori, Influence of microscale turbulent clustering in radar cloud observations, Journal of the Atmospheric Sciences, 71, 3569-3582 (2014)
  18. R. Onishi and J.C. Vassilicos, Collision Statistics of Inertial Particles in Two-Dimensional Homogeneous Isotropic Turbulence with an Inverse Cascade, Journal of Fluid Mechanics, 745, pp.279-299 (2014).
  19. R. Onishi, K. Takahashi, J.C. Vassilicos, An Efficient Parallel Simulation of Interacting Inertial Particles in Homogeneous Isotropic Turbulence, Journal of Computational Physics, 242, pp.809-827 (2013).
  20. K. Takahashi, R. Onishi, Y. Baba, S. Kida, K. Matsuda, K. Goto and H. Fuchigami, Challenge toward the prediction of typhoon behavior and down pour, Journal of Physics: Conf. Ser., 454, 012072 (2013).
  21. K. Matsuda, R. Onishi, R. Kurose and S.Komori, Turbulence Effect on Cloud Radiation, Physical Review Letters, 108, pp.224502 (2012)
  22. R. Onishi and K.Takahashi, A Warm-Bin-Cold-Bulk Hybrid Cloud Microphysical Model, Journal of the Atmospheric Sciences, 69, pp.1474-1497 (2012).
  23. R. Onishi, Y. Baba and K. Takahashi, Trans. JSME(B)， Vol.77 No.782, pp.1879-1891 (2011). [in Japanese]
  24. R. Onishi, Y. Baba and K.Takahashi, Large-Scale Forcing with Less Communication in Finite-Difference Simulations of Stationary Isotropic Turbulence, Journal of Computational Physics, 230, pp.4088-4099 (2011).
  25. R. Onishi, K. Matsuda, K.Takahashi, R. Kurose and S. Komori, Linear and nonlinear inversion schemes to retrieve collision kernel values from droplet size distribution change, International Journal of Multiphase Flow, 37-2, pp.125-135 (2011).
  26. R. Onishi, T. Sugimura and K. Takahashi, Condensation/evaporation calculation method for cloud droplets using the CIP-CSLR scheme, Journal of Environment and Engineering, Vol. 5 No.1, pp.1-14 (2010).
  27. R. Onishi, K. Takahashi and S. Komori, Influence of gravity on collisions of monodispersed droplets in homogeneous isotropic turbulence, Physics of Fluids, Vol. 21, 125108 (2009).
  28. R. Onishi, K. Matsuda, K. Takahashi, R. Kurose and S. Komori, Retrieval of Collision Kernels from the Change of Droplet Size Distributions with a Simple Inversion Scheme, Physica Scripta , T132-014050 (2008, 6pp).
  29. R. Onishi, T. Sugimura and K. Takahashi, Trans. JSME(B), Vol.74 No.748 pp.2443-2451 (2008). [in Japanese]
  30. K. Matsuda, R. Onishi, K. Takahashi, R. Kurose and S. Komori, Trans. JSME(B), Vol.74 No.744 pp.1777-1784 (2008). [in Japanese]
  31. S. Maksyutov, P.K. Patra, R. Onishi, T. Saeki, T. Nakazawa, NIES/FRCGC global atmospheric tracer transport model: description, validation, and surface sources and sinks inversion, Journal of the Earth Simulator, Vol. 9, pp.3-18 (2008).
  32. P.K. Patra et al., TransCom continuous experiment: 2. Comparison of CO2 transports at synoptic timescale, Global Biogeochemical Cycles, 22, GB4013 (2008).
  33. R.M. Law et al., TransCom model simulations of hourly CO2: experimental overview and diurnal cycle results for 2002, Global Biogeochemical Cycles, 22, GB3009 (Aug 2008).
  34. R. Onishi, K. Matsuda, K. Takahashi, R. Kurose and S. Komori, Trans. JSME(B), Vol.73 No.734 pp.2062-2069 (2007). [in Japanese]
  35. R. Onishi, K. Takahashi and S. Komori, Trans. JSME(B)， Vol.72 No.722 pp.2441-2448 (2006). [in Japanese]
  36. R. Onishi and S. Komori, Trans. JSME(B)， Vol.73 No.730 pp.1307-1314 (2007). [in Japanese]
  37. R. Onishi and S. Komori, Thermally-Stratified Liquid Turbulence with a Chemical Reaction, AIChE Journal, Vol. 52, No.2 February, pp.456-468 (2006).
  38. R. Onishi and S. Komori, Trans. JSME(B)， Vol.71 No.706 pp.1511-1518 (2005). [in Japanese]
  39. R. Onishi and S. Komori, Trans. JSME(B)， Vol.71 No.705 pp.1225-1230 (2005). [in Japanese]
  40. R. Onishi, T. Michioka, K. Nagata and S. Komori, Trans. JSME(B)， Vol.69 No.679 pp.636-643 (2003). [in Japanese]

Selected lectures in international conferences (Data at Feb. 2014)

  1. R. Onishi, Of Rainfall and Marine Snow: How Small-Scale Physical Interactions have Large-Scale Consequences, Leiden, the Netherlands, March, 2014. (invted keynote)
  2. R. Onishi, J.C. Vassilicos and K. Takahashi, International Conference on Frontiers in Computational Physics, Boulder, USA, 17 Dec., 2012. (invited)
  3. R. Onishi and K. Takahashi, International conference on Multiple Scales in Fluid Dynamics and Meteorology, Berlin, Germany, 9 June, 2011. (invited)
  4. R. Onishi, K. Matsuda, K. Takahashi, R. Kurose and S. Komori, APCOM'7 in conjunction with EPMESC XI, Kyoto, Japan, 6 Dec., 2007. (keynote)


Patents=2 & 1(applied) (data at Feb 2013)


Scientific Financial Support

2012-2015
Grant-in-Aid from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan for Young Scientists(B) 24760152

2011-2013
Japan Society for the Promotion of Science (JSPS) Postdoctoral Fellowships for Research Abroad

2009-2010
Grant-in-Aid from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan for Young Scientists(B) 21760143

2007-2008
Grant-in-Aid from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan for Young Scientists(B) 30414361