直接数値シミュレーションによる開水路乱流における乱流統計量及びその収支評価

抄録

Direct numerical simulation of a fully-developed open-channel flow has been carried out for the friction-velocity Reynolds number of 180.The free surface is approximated by a rigid slip wall.After verifying the computational accuracies, the budgets of various turbulence statistics including the budget of the triple velocity correlations have been obtained.The behavior of these quantities near the free surface has been examined in detail and implication for modeling is discussed.