ランダムフーリエモード法と急激変形理論の複合モデルによる鈍頭物体周りの流れの数値シミュレーション : 第1報,複合モデルおよび円柱周りの乱流解析へのモデルの適用(流体工学,流体機械)

概要

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A new simulation method to predict turbulence quantities around a bluff body has been developed using a combined model of the random Fourier modes and rapid distortion theory (RDT). In the proposed method, both large-and small-scale turbulent motions are simulated using the random Fourier modes varying in space and time, and the change of vorticity field around the body is modeled by the RDT. The novel advantage of the present method is as follows: 1. we can simulate a high-Reynolds-number turbulent flow around a bluff body, 2. we can obtain a time dependent fluctuating velocity field at arbitrary points around a body, 3. low computational cost compared with DNS and LES. The method is applied to turbulent flow around a cylinder and the results are compared with the previous measurement. The computational results are in agreements with the previous measurements in the front region of the cylinder. It is concluded that the present method is useful to simulate the turbulence fields where the effects of distortion of eddies and blocking by the wall are dominant.
2008-01-25