A solid-fluid coupling simulation for wind borne debris: auto-rotating flat plate and flying flat plate

Abstract eng:
This study investigates the behavior and the impacts of wind-borne debris under strong wind such as tornados or typhoons. Collisions of wind borne-debris cause huge loads on the local area of houses and buildings, that are quite larger than conventional wind load. As a result, the house has damaged and furthermore the damaged houses by debris attack successively generate secondary debris as a chain reaction. In this study, we propose the numerical model for an interaction between solid motion and fluid flow in order to predict the behavior of wind-borne debris and to capture the wake flow of the flying debris. This simulation model uses the fixed Cartesian grid system to solve a solid motion with 6DOF (six degrees of freedom) and a fluid flow for the resulting solid location on the fixed grid because we get rid of procedure of grid reconstruction according to moving objects. As a result, this approach makes it possible that plural number of wind borne debris fly with complicated trajectories in turbulent wind. We also present the collision model on the fixed Cartesian grid system. Next, we apply the present method to the rotating and flying flat plate. This flat plate means to imitate a shape of a roof tile and accordingly we can provide the fundamental data concerning the damage of houses due to the flying roof tile. For the numerical validation, we estimate the numerical results qualitatively and quantitatively in comparison with experimental results. Then, in order to evaluate the damage when wind-borne debris collide with a building and so on, we represent the debris behavior with 6DOF immediately before collision. Currently using these data, we can generally estimate the collision damages based on database of the flying debris test. However, in order to direct to higher performance of the numerical technique, this study also tries to obtain the impulse and the impact load in the process of collision of the wind-born debris to the wall of houses.

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