Unsteady Flows Past a Circular Cylinder Started Impulsively in the Reynolds Number Range 500<Re<10^4 : The Pressure Distribution on the Surface of the Cylinder

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 Temple's equation using the measured velocities on a closed circuit which was selected to avoid the cumber-some estimation of viscous terms. The estimated distributions of the pressure coefficient C_<pθ> at Re=1200, disagree with those of the numerical analysis for Re=1000 by Bar-Lev and Yang, but agree with those of the numerical analysis for Re=500 by Collins and Dennis. 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 to that of C_<pθ> obtained by both the conventional numerical analysis and the experimental study, though their quantitative agreement is insufficient.
一般社団法人日本機械学会の論文
1990-08-15