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Use of TransAT to optimize the smoke-vent efficiency


Overview: Smoke vents are major security devices in the case of a fire in buildings, and as such they must be efficient under all weather conditions. Outside wind can strongly limit the evacuation of the smoke, and the smoke vents must be verified before installation. Neighboring buildings can also affect the efficiency of smoke evacuation, which requires a design of the systems to ensure high discharge efficiency.

The challenge: Up to now, smoke vents – similar to the example shown in the upper figure- were tested in wind tunnels. However, wind-tunnel simulation does not provide a faithful picture of the flow. Computational simulations turn to be a very good tool to design these systems and their optimal location on top of the buildings. Moreover, since CFD simulations are capable to return a better picture of the flow and pressure field, it helps test several design options, before the production of the smoke vent itself.

TransAT Solution: TImmersed surface Technology (IST) combined with Block-Mesh Refinement (BMR) is systematically used in ASCOMP to simplify the meshing around such complex configurations, which furthermore include very small mechanical pieces. Using steady state simulations with RANS turbulence modeling gives very fast results to obtain a first idea of the quality of the smoke extraction, for different wind speed and directions. On the other hand, more expensive techniques such as Large Eddy Simulations can be performed to optimize the design of the smoke vents in conditions close to reality.

InfoExpert: Contact our expert

Dr Mathieu Labois
ASCOMP Switzerland
Tel. + 41-44-445-4072