DESIGN OF THE CITADEL OF BONIFACIO URBAN AREA THROUGH EXPERIMENTAL AND NUMERICAL ASSESSMENT OF PEDESTRIAN COMFORT
The city of Bonifacio, located at the extreme south end of Corsica Island, is said to be the windiest city of Europe, and has earned its nickname as “The daughter of The Wind”. The Montlaur Citadel is a district of Bonifacio located on a small peninsula. It is an ancient military facility composed of various massive barracks and churches. The peninsula is characterized by its high cliffs (60 m above the sea level) which make the Citadel particularly exposed to high wind.
The city of Bonifacio is eager to modernize the location with various services and recreational activities. Urbalterre, an urban architect agency, was in charge of designing the urban area of the future Montlaur Citadel.
Aware of the pedestrian comfort issues which may arise from the high wind blowing over the peninsula, Urbalterre wished to design the buildings sizes and locations in the district in order to optimize the pedestrian comfort on the citadel.
To do so, Urbalterre used a mix of numerical and experimental approaches to assess pedestrian comfort using:
- Wind tunnel measurements based on Particle Image Velocimetry for a precise assessment of the wind behavior in the district
- CFD simulations to optimize the design of the district, most particularly using vegetation
The study was conducted following 4 consecutives steps:
1) Assessment of the statistics of the wind blowing on the Citadel using CFD simulations to extrapolate weather data form a neighbor weather station to the location of the Citadel
2) A first precise assessment of the pedestrian comfort on an early design of the district using PIV measurement in a wind tunnel experiment
3) Successive iterations, using CFD, of the design of the district to enhance the pedestrian wind comfort
4) A final assessment of the pedestrian comfort in wind tunnel of the optimal version of the district.