振動流中の円柱周りの流れの三次元数値解析 : 第2報,流体力特性(流体工学,流体機械)

概要

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Flow around a circular cylinder in oscillatory flow was studied by a numerical simulation using a finite-volume method. The computations were carried out by assuming 3-dimensional (3-d), unsteady, incompressible and viscous flow through Keulegan-Carpenter number (KC) in the range of 3≦KC≦25 at Stokes number (β)=95. The distribution of transverse force coefficient C_L corresponds well to the shape of spanwise cell structure formed on a cylinder surface at KC=3,4. At KC=20, there appear many peaks of dominant frequencies in the power spectrum of in-line force coeffient C_F and there also appears the decrease of spanwise correlation coefficient of C_L, which cause to decrease the rms values of in-line and transverse force coefficients C_Frms and C_Lrms. The drag and inertia coefficients of Morison equation C_D and C_M and C_Lrms are compared with the measured ones and their results are in good agreement. It was found that C_D is the maximum value and C_M the minimum when twin-vortices are formed.
社団法人日本機械学会の論文
2002-06-25