流力振動シミュレーションを目的とした計算プログラムのキャビティ流れ解析による検証(<小特集>水)

概要

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Velocity vector fields of the two-dimensional square cavity flow with the Reynolds number range up to 100,000 were numerically investigated using a thermal-hydraulics computer program based on Patankar's discretization algorithm employing the control volume technique and the second-order accuracy to verify its applicability to the design survey evaluation on the characteristics of flow-induced vibration, which may critically affect the integrity of mechanical structures. Satisfactory agreements were observed between the presently computed flow fields and the corresponding results available in the previous publications for the Reynolds number range up to 10,000. For the higher Reynolds number range, the numerical simulations revealed unsteady and unstable motion of the primary vortex and separation, integration as well as translation of the secondary vortices with the smaller eddies allong the cavity walls. Based on the correlation between the Fourier power-spectrum peaks of the vortex-induced force and the numerically revealed unsteady behavior of vortices, the contribution to the vortex-induced force was shown to be mainly due to the motion of the primary and the secondary vortices. Through the present studies, the computer program employed was verified to provide survey designers with sufficiently accurate information concerning the vortex-induced force on the fluid-structure interfaces.
1994-06-15