Ko TAKAKI

Numerical analysis of the arrival and flow process of rainfall particles on the surface of the structure

Takumi SHIMOMURA

The purpose of this study was to construct a numerical analysis model of the arrival process until the precipitation particles adhere to the concrete structure and the flow process after the arrival. Furthermore, in order to confirm the validity of the numerical analysis, an experiment was conducted using a full-scale model. In addition, the analysis results were verified by comparing with the experimental values.
First, we conducted an experiment simulating rainfall using a model of a full-scale concrete structure. As a result, it was found that the water content and range of precipitation reaching the concrete surface vary greatly depending on the surrounding wind conditions and model shape. It was also found that under no wind conditions, the amount of rainfall that reaches the side of the rainfall is small, and the water that collects on the upper edge flows to the side, causing a rainfall effect.
Next, we performed a numerical analysis of the process of reaching the precipitation particles. Furthermore, the validity was verified by comparing the wind speed and the amount of precipitation reached in the experiment with the numerical analysis results of the wind conditions and the numerical analysis results of the arrival of rainfall particles. As a result, it was found that the amount of rainfall particles reached at each part of the structure differs greatly depending on the wind conditions. In addition, in the numerical analysis of the rain particle arrival process constructed this time, it was found that the amount of rainfall particles attached can be quantitatively evaluated by combining the numerical analysis of the wind conditions, which is appropriate in comparison with the experimental results.
Finally, we constructed a flow model due to rainfall on the concrete surface. From the analysis results, it was found that the flow velocity of water on the concrete surface differs greatly depending on each part when rain acts on the side surface due to the wind.