Tracer dispersion simulation in Oklahoma City using locally mesh-refined Lattice Boltzmann Method

Onodera, Naoyuki   ; Idomura, Yasuhiro   ; Kawamura, Takuma ; Nakayama, Hiromasa   ; Shimokawabe, Takashi*

A plume dispersion simulation is very important for designing smart cities. Since a lot of tall buildings and complex structures make the air flow turbulent in urban cities, large-scale CFD simulations are needed. We develop a GPU-based CFD code based on a Lattice Boltzmann Method (LBM) with a block-based Adaptive Mesh Refinement (AMR) method. The code is tuned to achieve high performance on the Pascal and Volta GPU architectures. We conducted a tracer dispersion simulation in Oklahoma City. The computational boundary conditions are given from real building data and WRF analysis results, respectively. By executing this computation, wind conditions in the urban area and details of plume distribution were reproduced with good accuracy.