樹木群の耐風性に関する数値シミュレーション

抄録

Numerical analysis of flow around vegetations with different heights was carried out to reduce windthrow damage. The velocity, pressure distribution and drag depending on the wind direction and the wind velocity were investigated by steady and unsteady flow simulations. The tree models were arranged in a configuration based on previous experimental setups, and the analysis was carried out using the RANS method for steady flow simulations and the LES method for unsteady flow simulations. The results of the steady flow simulations showed that the drag coefficient of the trees varied depending on their position relative to the wind direction. The drag acting on the tree in the wake behind another tree with small crown tends become more larger. The results of the unsteady flow simulation showed that vortex shedding and vortex interaction with trees affected acting force of the transverse direction. The pressure drop associated with vortex formation was found to significantly influence the force acting on the trees.