高フルード数開水路乱流場の直接数値シミュレーション

抄録

Direct numerical simulation (DNS) of the high-Fr turbulent open-channel flow at the Froude number of 1.8 based on the bulk velocity, gravity acceleration, water depth, were carried out by means of the multi-interfaces advection and reconstruction solver (MARS) method.
  In this high-Fr flow, surface waves are constructed of large-scale gently bumped waves with the maximum wave-height approximately corresponding to 4% of the water depth and the high wave-number isotropic waves produced by surface fluctuations. This high wave-number surface deformations might be increased the wall-normal turbulent intensity and the redistribution ratio of turbulent intensities near free-surface was in good agreements with the experimental formula proposed by Nezu (2002).