Virtualwind is an advanced 3D wind flow modeling and visualization software solution. It empowers building architects, landscape architects, engineers, builders, climatologists, educators and students to quickly predict, understand and convey complex wind flow phenomena in urban, suburban and rural environments.

VirtualWind is a CFD plugin for Sketchup which discontinued a while ago and that looked freaking sweet.

Virtualwind is ideal for sustainable building design considerations (sitting analysis, green roofs, living roofs, pedestrian-level wind, alternative transportation, natural ventilation, solar panel placement, heat loads, and more) and for optimal placement of wind turbines. Key features include: