Generating conformal hexahedral meshes with boundary layers for urban buildings and atmosphere is a challenging task. We have created a tool that reads a .geojson file with 3D building models and creates a CAD model and mesh for the buildings and the urban atmosphere for CFD simulations. We are looking at different strategies to automate the entire CFD model creation process. The same geometry models could also be used for building energy calculations using EnergyPlus. MeshKit’s PostBL tool was used to add boundary layers after the creation of an initial coarse hex mesh. Mesh models for the whitewalled 41 storey, 495 ft, Xerox Centre building and other closeby buildings near Dearborn and Monroe Street are shown below.
Another model (figure below) consisting of Navy Pier, lake point tower and 5 nearby buildings between the streets: N McClurg Ct., E Ohio St., Lake Shore Dr., and River East Art Promenade Center is created using our tools. Current efforts are focussed on automating the process and creating models for the entire city of Chicago.