Simulation of the likely airflow within the passively downdraught cooled SSEES building. The research employs a physical modelling technique originally devised by Paul Lyndon at the Department of Applied Mathematics and Theoretical Physics at Cambridge and now being developed by Andrew Woods at the University's BP Institute for Multiphase Fluid Flow. The simulations revealed a potential problem of stalling in very warm conditions when departing air is cooler than ambient. The design was modified accordingly.

The model tank is immersed in a large water tank filled with saline fluid as the background environment; a source of fresh water is added to the base of the building to mimic the heating in the lower floors of the building. This drives the upward flow in the stacks and draws in additional fluid through the stack. Pre-cooling in the stack is modelled by adding dense saline fluid (blue) to the stack. This mixes down into the ground floor, and then mixes with the fresh water producing a relatively low density fluid which rises through the stack, as long as the analogue pre-cooling is not too intense. Results from the experimental modelling help establish flow regimes and guide the control strategy for the building.

The project was on exhibition in the Wellcome Wing of the Science Museum September 2005 until March 2006.

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