日本機械学会論文集B編
Online ISSN : 1884-8346
一般論文
平行平板間乱流に添加された直鎖状多連結ばねダンパ要素による摩擦抵抗低減の数値シミュレーション
歌田 裕太守 裕也岩本 薫村田 章川口 靖夫安藤 裕友千田 哲也
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79 巻 (2013) 806 号 p. 1937-1950

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Drag-reducing flow owing to polymer additives in wall turbulence is investigated by means of numerical simulations. A spring-damper chain element model is employed to express a spatial concentration and flexible motion of the polymer in a turbulent flow. The model consists of some beads linked by springs and dampers. The influence of the model's length upon the turbulent flow is mainly focused. As lengthening the model, the skin-friction drag decreases since the turbulent contribution to the skin-friction coefficient decreases while the body force term due to the model increases. The behavior of the model and the energy transport process in the drag-reducing flow due to the model are discussed to clarify the mechanism of the drag reduction.

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