脈動流場におけるくぼみ付き流路内の流動パターンと運動量輸送

概要

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The present study explores numerically the differences in flow patterns and oscillatory momentum transport in three grooved channels with different cavity lengths for pulsatile flow. Numerical simulation by the Finite Element Method is performed for the same parameters as the previous experimental conditions, i.e., the net flow Reynolds number Re_s=234 and the oscillatory fraction of the flow rate P=0.43. In particular, the effect of the imposed frequency is considered in the Strouhal number range of 0.2 to 2.8. The vortex strength for the shortest cavity has a peak at the imposed frequency close to the natural one for self-sustained oscillation, i.e., St_n=1.92. While the Strouhal number for the maximum strength is reduced as the cavity length becomes large. It is found that the momentum transport due to the oscillatory components of the flow plays a dominant role in the vortex strength. Fluid particle ejection from the groove is also examined to represent fluid mixing characteristics. The trend for particle ejection corresponds well to the vortex strength. Additional flow visualizations support the numerical simulation.
一般社団法人日本機械学会の論文
2000-12-25