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日本航空宇宙学会関西支部分科会「流体力学における現代的アプローチ」

日時 2013年04月11日
16時30分 から 17時30分 まで
場所 京都大学 桂キャンパス C3棟 3階 b3n03室(航空宇宙工学専攻会議室)
連絡先
京都大学 航空宇宙工学専攻 高田 滋
URL http://www.mfd.me.kyoto-u.ac.jp/jsass23-25.htm

Is there any physics missed by the Navier-Stokes equations?

Dr. Demenico Giordano
(European Space Agency & The Von Karman Institute for Fluid Dynamics, Belgium)

要旨

Since our student days, we fluid dynamicists become accustomed to the idea that the velocity field is the sole kinematic unknown to consider in flow fields. The internal angular momentum is systematically relegated to a rank of lower importance in the vast majority of the applications on the justifying assumption that torques distributed throughout the fluid are usually negligible. There are, of course, noticeable exceptions such as electrically-polarisable and magnetisable fluids; thus the concept of internal angular momentum has become by default associated with the presence of the electromagnetic field in a fluid that reacts to it through polarisation and magnetisation. But, is this truly always the case? The present study reflects on the by-default assumption of discardable internal angular momentum and tries to unravel the implications of the presence of this physical variable on the fluid-dynamics and thermodynamics equations. The (almost provocative) title descends from the fact that, when internal angular momentum is accounted for in the governing equations, linear irreversible thermodynamics produces phenomenological relations different from the traditional ones that close the fluid-dynamics balance equations into the form known as Navier-Stokes'. Are these modified phenomenological relations leading to any new physics that is, therefore, missed by the Naier-Stokes equations? Are they able to resolve flow-field features that so far have proven outside the reach of the Navier-Stokes equations? These interesting questions, stimulating scientific curiosity and deserving inquiring minds' attention, constitute the main themes of this study !

参考:吉田-桂キャンパス間バス時刻

  • 吉田 15:00発(桂15:55着)
  • 桂  17:55発(吉田18:50着)