D114 水乱流中で変動する膜に沿う整構造への多糖の影響

概要

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Direct numerical simulation has been conducted for turbulent water flow around a waving film with polysaccharide in order to examine the turbulence modification by the exudation of the biopolymer. The cluster models of beads, springs and dashpots are introduced near the film as representative of the entangled polysaccharide. An unsteady generalized curvilinear coordinate is used for transforming from waving boundary to flat boundary. The computational results show that the population of streamwise vortices decreases near the surfaces due to the cluster models, which leads to a decrease in the shear stress. Also, it is found that the attenuation of film waving is caused by the decrease in the near-surface high-pressure region associated with the attenuation of the coherent structure.
日本流体力学会の論文
2001-07-31