流体力学ユニット (ピナキ・チャカラボティ)

ピナキ・チャクラボルティー

流体力学ユニット

ピナキ・チャカラボティ 准教授

pinaki at oist.jp

 

研究概要

流体力学ユニットでは、物質の流れ方を研究しており、その対象は台風の乱流やパイプラインの中を流れるオイルに及びます。本ユニットでは、エネルギーが二次元、三次元的に拡散する様子の極めて重要なディテールを知るため、石鹸水の薄膜とパイプを通して挙動を詳細に分析しています。このような現象をモデル化することで、悪天候の動向を予測してより良い対策をとれるようになり、また石油パイプラインネットワークの管理にも役立ちます。

研究成果

  • F. Huang, P. Chakraborty, C. C. Lundstrom, C. Holmden, J. J. G. Glessner, S. Kieffer, and C. E. Lesher. 2011. Reply to Brief Communications Arising: Isotope fractionation in silicate melts by thermal diffusion. Nature, vol. 472, pp. E2–E3, DOI: 10.1038/nature09955. PDF
  • G. Gioia, P. Chakraborty, S. F. Gary, C. Zuniga Zamalloa, and R. D. Keane. 2011. Residence time of buoyant objects in drowning machines. Proceedings of the National Academy of Sciences, vol. 108, no. 16, pp. 6361-6363, DOI: 10.1073/pnas.1015183108. (Featured in Research Highlights: Getting through a drowning machine, Nature, 472(9), 2011; PNAS Media Selections.) PDF
  • P. Chakraborty, T. Tran, and G. Gioia. 2011. Leading-order dynamics of gravity-driven flows in free-standing soap films. Journal of Elasticity, vol. 104, Issue 1, pp. 105-114, DOI: 10.1007/s10659-011-9317-6. (Invited paper.) PDF
  • G. Gioia, N. Guttenberg, N. Goldenfeld, and P. Chakraborty. 2010. Spectral theory of the turbulent mean-velocity profile. Physical Review Letters vol. 105, article 184501. PDF
  • T. Tran, P. Chakraborty, N. Guttenberg, A. Prescott, H. Kellay, W. Goldburg, N. Goldenfeld, and G. Gioia. 2010. Macroscopic effects of the spectral structure in turbulent flows. Nature Physics, vol. 6, no. 6, pp. 438-441. (Cover Image.) PDF
  • F. Huang∗, P. Chakraborty∗, C. C. Lundstrom, C. Holmden, J. J. G. Glessner, S. Kieffer, and C. E. Lesher. 2010. Isotope fractionation in silicate melts by thermal diffusion. Nature, vol. 464, no. 7287, pp. 396-400. (∗ equal contribution.) PDF
  • T. Tran, P. Chakraborty, G. Gioia, S. Steers, and W. Goldburg. 2009. Marangoni shocks in unobstructed soap-film flows. Physical Review Letters, vol. 103, article 104501. PDF
  • P. Chakraborty, G. Gioia, and S. Kieffer. 2009. Volcanic Mesocyclones. Nature, vol. 458, no. 7237, pp. 497-500. (Featured in New view on erupting volcanoes, Nature Hot Topics, 26 March 2009; Volcano or tornado?, Nature Podcast, 26 March 2009; Inside the volcanoes plume a thunderstorm rages, National Public Radio, 25 March 2009.) PDF
  • G. Gioia, P. Chakraborty, S. Marshak, and S. Kieffer. 2007. Unified model of tectonics and heat transport in a frigid Enceladus. Proceedings of the National Academy of Sciences, vol. 105, no. 34, pp. 13578-13581. (Cover Image; Featured in Physics Today, October 2007; This Week in PNAS, Saturn Moon’s geysers don’t need liquid water?, National Geographic News, 17 August 2007.) PDF
  • P. Chakraborty, S. Balachandar, and R. J. Adrian. 2007. Kinematics of Local Vortex Identification Criteria. Journal of Visualization, vol. 10, no. 2, pp. 137-140. (Invited review paper; 10th Anniversary Issue.) PDF
  • G. Gioia, P. Chakraborty, and S. Kieffer. 2006. Lava channel formation via the viscoplastic indentation of hot substrates. Geophysical Research Letters, vol. 33, L19305. PDF
  • G. Gioia, P. Chakraborty, and F. Bombardelli. 2006. Rough-pipe flows and the existence of fully developed turbulence. Physics of Fluids, vol. 18, article 038107. PDF
  • P. Chakraborty, G. Gioia, and S. Kieffer. 2006. Volca ́n Reventador’s unusual umbrella. Geophysical Research Letters, vol. 33, L05313. (Featured in Research Highlights: Blowing its top, Nature, 440, 386, 2006; Editor’s Choice: Collapsing umbrella, Science, 311, 1675, 2006; Odd eruption may mean new volcano danger, National Geographic News, 15 March 2006.) PDF
  • P. Chakraborty, S. Balachandar, and R. J. Adrian. 2006. Comment on “Axial stretching and vortex definition”. Physics of Fluids, vol. 18, article 029101. PDF
  • G. Gioia and P. Chakraborty. 2006. Turbulent friction in rough pipes and the energy spectrum of the phenomenological theory. Physical Review Letters, vol. 96, article 044502. (> 35 citations; Featured in New UI research looks into classic unsolved problem, Chicago Tribune, 2 April 2006; Turbulence - the last mystery of classical physics, Softpedia, 12 Feb 2006; etc.) PDF
  • P. Chakraborty, S. Balachandar, and R. J. Adrian. 2005. On the relationships between local vortex identification schemes. Journal of Fluid Mechanics, vol. 535, pp. 189-214. (> 120 citations.) PDF