With more and more buildings being multiple storeys reaching over 10m it is becoming more common to evaluate the impact these buildings may have on the local wind microclimate.
Tall buildings can cause funnelling effects or down drafts local to the area at the base, through the use of Computational Fluid Dynamics (CFD). These problem areas along with the local site microclimate can be evaluated for pedestrian comfort and safety.
With many local planning regulations the new developments impact on the local microclimate can have a major impact during the planning process.
Through using CFD, the development impact can be evaluated with the local area being modelled. The analysis can guide the use of remediation to reduce the impact of wind, improving the areas microclimate, through allegations in design or additional landscaping.
Through using the Lawson Criteria the standing, sitting, walkways and other areas can be classified and evaluated to establish if the area is acceptable.
LAWSON CRITERIA - AREAS
General Safety Issues
Standing & Entrances
A building located in a open field to one located in a city environmental will behave very diferently due to the impact of the local weather microclimate.
Through CFD analysis, a building can be located anywhere in the world, with the local buildings and landscape modelled as well as weather data to establish the wind gust averages local to a development.
Through modelling the local cityscape and simulating the environmental conditions from local weather data, the impact of a proposed development can be evaluated.
The air flow through tall buildings can vary and be directed from architectural detailing and planning. With tall buildings becoming more frequent, the impact the high rise buildings can have on the local environment as well as the forces on the building itself needs to be considered in the design of a proposed development.
To generate a detailed CFD model, the weather data used to establish the data boundaries needs to be taken from a local source and interpolated to allow a gust curve from the current angle.
By using local weather data to the development, that has been averaged over multiple years to account for any anomalies in weather conditions, the results from the simulations can be more reliable and used to inform design decisions.
Wind studies come in a range of sizes, from large development with multiple tower blocks, to single towers or buildings. The effect on these buildings and the impact these have on the local microclimate is an a important aspect for both planning applications and for the safety and general use of the buildings.
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