Abstract
This study analyzed the flow field within a rural village involving rows of windbreak trees called Igune on the Osaki Koudo in northern Miyagi Prefecture, Japan. Field observation was first conducted to obtain the spatial distribution of mean wind speed within the whole village area for validation data. Then, large-eddy simulations (LESs) were conducted to reproduce the flow field within the village and analyze the windbreak effect of Igune on the wind environment within the village after the validation using the observation data. The wind speed showed good agreement between the simulation and field observations. In the village, the mean wind velocity was reduced by half compared with that at the outside of the village. Additionally, a parametric study was carried out to understand the relationship between the streamwise spacing of Igune rows and their windbreak effect based on the simplified 2-dimensional flow field involving 3 Igune rows. The appropriate windbreak effect appeared when the distance between Igune rows was within 10 times the Igune height.
