A CAD model of Singapore has been uploaded to SimScale in STEP format. The mesh was generated using the automatic hex-dominant mesh operation for external flow. The flow domain around the buildings was set to 8000x8000x1200m in order to minimize effects of the bounding walls. The resulting mesh consists of a little more than 3,000,000 cells.
The simulation itself was set up using the steady-state incompressible flow analysis type with a k-Omega-SST turbulence model. The airflow was simulated at 5m/s incoming wind velocity. The effect of the ground was neglected in this first simple simulation setup.
The results allow to visualize the wind velocities as well as the pressure field around every single building. Thereby the acting force onto the building can be computed.