壁面近傍の微小円柱を過ぎる粘弾性流体の流れによる抗力と揚力

概要

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In detergent engineering and polymer processing, it is important to study the force exerted on an obstacle placed near a wall. In the present study, we numerically analyze the flow of viscoelastic fluids past a minute cylinder which is set at or near an inside wall of a two-dimensional channel. The upper convected Maxwell model and the finite-element method are used as the constitutive equation and the numerical method, respectively. Drag and lift of the cylinder are calculated for low Reynolds numbers (Re) and various Weissenberg numbers (Wi) of positive and negative values. Drag coefficient (C_D) slightly changes with Wi. Lift coefficient (C_L) monotonously decreases with increasing Wi irrespective of the sign of Wi. C_L is greatly changed with Wi and is more sensitive to the elasticity of the fluid than C_D. C_D and C_L decrease as the cylinder is separated from the wall.
社団法人日本機械学会の論文
1995-02-25