Wind assessment in coastal Jakarta using supercomputer simulations with tree drag parameterization

Ishigaki, Shiho*; Kanda, Manabu*; Inagaki, Atsushi*; Junnaedhi, D. G. A.*; Onodera, Naoyuki   ; Hasegawa, Yuta   ; Watanabe, Tsutomu*

Due to rapid urbanization, accurate wind assessment is crucial. Evaluating wind flows around buildings, including the effects of trees, is part of the planning application process for new developments. In this study, supercomputer simulations using TSUBAME 4.0 were conducted to represent coastal parts of Jakarta, Indonesia. All simulations were run until a quasi-steady condition was achieved, using the Lattice Boltzmann Method (LBM). A tree drag parameterization scheme was incorporated to investigate how trees affect wind dynamics. Turbulence was modeled using Large Eddy Simulation (LES) and the Smagorinsky model. The results indicated that wind speed generally decreases due to the presence of trees, while TKE increases in some areas when wake effects are triggered by trees.