流体力学セミナー流体力学セミナー

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流　体　力　学　セ　ミ　ナー　 2012

日時： 5月 14日（月） 15:00 から 16:30

場所： 京大 数理解析研究所 204号室

講師： 多羅間　充輔氏
(京都大学 大学院理学研究科 物理学第一分野 )

講演題目：
Dynamics of a deformable self-propelled particle under external
forcing in a two dimensional space

講演要旨：
In this seminar, I’d like to talk about our recent research on
dynamics of a deformable self-propelled particle under external
forcing in a two-dimensional space. Our analysis is based on the model
equations derived from the symmetry argument for the velocity of the
centre of mass and a symmetric tensor variable characterising
deformation. Here, we consider two types of external force. One is a
gravitational force, which enters additively into the time-evolution
equation of the velocity vector. The other is an electric force
supposing that a dipole moment is induced in the particle. This force
affects the time-evolution equation of the deformation tensor. We have
carried out numerical simulations of the time-evolution equations. As
a result, a variety of dynamical states and dynamical phase diagram
are obtained by changing the magnitude of the external force.
Theoretical analysis has also been developed to reproduce some of the
bifurcations. I would also like to mention the origin of the dynamical
states.

Ref: M. Tarama and T. Ohta, Eur. Phys. J. B 83, 391-400 (2011).
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世話人：山田 道夫(京大数理研)， 藤 定義(京大)，松本 剛(京大理)
アドバイザー：船越 満明（京大情報学）、水島 二郎(同志社大工)、
余田 成男（京大理）
連絡先：山田道夫 yamada＠kurims.kyoto-u.ac.jp
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