Building Physics

BMT WBM provides wind engineering specialist consultancy services for the assessment of all aspects of architectural aerodynamics for the cost effective and safe design of civil engineering structures.

In light of increasingly driving sustainable design criteria, the building industry is increasingly facing basic building physics related engineering challenges such as ventilation, envelope performance, microclimate and internal air quality. Building physics draws heavily on rapidly evolving specialist computational modelling techniques such as Computational Fluid Dynamics (CFD).

Toxic gas propagation from laboratory buildings

BMT WBM has extensive experience of assessing the impact of all manner of developments and sources on ambient air quality. This includes dust collection design review, temperature rise study, exhaust and fume dispersion modelling, and impact assessment. Our expertise includes the design and assessment of stacks and measures to reduce emissions and their impact on the environment.

We have considered factors such as topography, solar load, humidity, buoyancy, building effects and atmospheric stability in the modelling which are often poorly treated. A high degree of competence is therefore required to select the most appropriate model, to specify appropriate input data and most importantly, to evaluate the results.

The informative and visual 3D CFD results greatly assisted designers to make quick and scientific decisions. This saved potential re-construction costs, improved performances and minimized risks during operations.

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BMT WBM’s modelling experience included the following service area:

  • Gas dispersion impact from building stacks
  • Gas dispersion from off-shore oil and gas platforms
  • Fume and Odour dispersion from laboratory buildings
  • Exhaust gas impact on helipads on buildings and off-shore oil and gas platforms
  • Fire and smoke propagation from public transport and buildings
  • Radiation, Solar load, and temperature rise on the buildings 
  • Indoor and Outdoor air quality modelling

Air Ventilation Assessment (AVA) by Computational Fluid Dynamics (CFD)

New Residential Tower Development in HK

BMT WBM engineers were engaged to provide leading Honk Kong architects with CFD expertise at the concept design stage of a residential tower. The proposed development will replace an existing 10 storey educational building for an 18 storey, 3 car park levels single tower residential building. The development site is located at the periphery of a major wind corridor and is surrounded by medium and tall buildings. BMT WBM was requested to investigate local air ventilation performances, environmental wind levels and associated impact on pedestrians.

BMT WBM has significant expertise in assessing the impacts of new building developments on the local wind environment and provides services ranging from initial design reviews to alternative design recommendations and appraisals by using sophisticated analysis techniques.

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BMT WBM has conducted a detailed AVA analysis through the use of CFD. The investigations utilized complex methodologies which took into account wind from 16 different directions in and around the proposed development. BMT WBM’s independent analysis provided its client with critical data which enabled them to better understand the
impacts the proposed design on the surrounding environment. Furthermore, BMT WBM engineers provided data which allowed the client the opportunity to alter their initial design for another which produced more favourable result.

After redesigning the floor plan and widening the gap to the neighbouring building, the architects had achieved a suitable design with a much improved air ventilation performance and wind environment for pedestrian.