異なる波長を持つ波形が重畳する進行波列上の気流の数値計算

概要

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Direct numerical simulations of the airflow over periodic superposed wave train with different wave lengths and phase velocities were carried out to investigate effects of airflow perturbation due to long waves on momentum transfer from the airflow to short waves. Both the short and the long waves travel in the streamwise direction of the airflow. The results show that the short wave-correlated component of the mean velocity and the pressure are affected by the long waves. The effects of the long wave on the momentum transfer from the airflow to the short waves depend on the wave ages of the short waves. For the low wave ages, it is guessed that the variance of the shear stress in the inner region due to the long wave-correlated momentum flux effects on the momentum transfer. On the other hand, for the middle wave ages, phase shift of the cats eye caused by the mean velocity variance due to the long waves would effect on the momentum transfer.