レイノルズ数Reが500〜10^4の突然出発する円柱まわりの流れ : 第2報,円柱表面上の圧力分布

概要

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The velocity fields around a circular cylinder which was started impulsively in a water tank were measured by flow visualization techniques. The pressure on the surface of the cylinder was estimated by the line integral of the Temples equation using the measured velocities on a closed circuit which is selected to avoid the cumbersome estimation of viscous terms. The estimated distributions of the pressure coefficient C_<pθ> at Re=1 200, which are in disagreement with those of the numerical analysis for Re= 1 000 by Bar-Lev, are in agreement with those of the numerical analysis for Re=500 by Collins. The variation of the local values of the pressure coefficient C_<pθ> (θ=90° and 180°, θ: azimuthal angle measured from the frontal stagnation point of the cylinder) with elapsed time was found to be similar as that of C_<pθ> obtained by both the conventional numerical analysis and the experimental study, though their quantitative agreement is insufficient.
社団法人日本機械学会の論文
1989-06-25