Dynamics of localized structures in convections

Monday, June 3, 2013 - 9:40am - 10:20am
Keller 3-180
Iima Makoto (Hiroshima University)
We study dynamics of localized structures in fluids. First, we present a detailed network connecting various solutions representing steady and traveling localized states in binary fluid. The structure of the network can be classified into four categories based on the local network connections. Second, we show an experimental work of bioconvection caused by Euglena suspension illuminated from below. In this convection, localized convection cells are observed as well as the binary fluid convection; But the mechanism has not been clarified. In our experiment, an annular container was used to achieve S^1 condition in the azimuthal direction, and the width of the container is a similar size of the single convection cell in three-dimensional domain. After introducing the basic mechanism of bioconvection, we show the result suggesting the bistability structure of this suspension. The topics of this talk are joint works with Dr. T. Watanabe(JAXA), E. Shoji(Hiroshima University) and Prof. Y. Nishiura(Tohoku University).