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| 概要 |
Effects of surface roughness on the pressure distribution along a wavy surface are studied by putting various artificial roughness (trip wires) on a solid Stokes wave with a height-to-length ratio H/L... = 0.1. When a single trip wire is mounted on the Stokes wave, the pressure drag coefficient Cd of the wave shows various values depending on the position (phase) of the trip wire. That is, when a single trip wire is mounted on the wave surface below the mean level of the Stokes wave, the value of the pressure drag coefficient, Cd is equal to or smaller than that of the wave without trip wires, Cd_0.Onthe other hand, when the single trip wire is mounted on the wave crest, the value of Cd is larger than Cd_0.Moreover this value of Cd has shown nearly constant value of 10×10^<―2> in the present range of the Reynolds number, 170 < Re_2 < 2200, where Re_2 is the Reynolds number based on the velocity of the free stream Ll。andthe diameter of the trip wire, 𝜑. When a train of trip wires covers the wave crest, the pressure drag coefficient Cd does not depend much on the number of the trip wries and shows nearly constant value of 1.0 x 10―2 in the above range of the Reynolds number続きを見る
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