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Effectiveness Assessment of Tunnel Fire Protection Strategies – A Multi – Scale Approach For Numerical Simulations

pubblicazioni - Memoria

Effectiveness Assessment of Tunnel Fire Protection Strategies – A Multi – Scale Approach For Numerical Simulations

Descrizione dei principali risultati ottenuti con le attività modellistico – numeriche concernenti l’approccio multi-scala per l’analisi degli incendi nelle reti di trasporto. La principale attenzione è stata focalizzata sulla metodologia impiegata.

In order to verify the effectiveness of different fire protection strategies applied to subway and road tunnels, numerical analyses were performed using a multi-scale approach with different tools, as CFD simulations appear, in many cases, too long-running for a direct application. The regions of the domain where the main phenomena are foreseen in huge civil transport scenarios are small compared to overall compartment, requiring the accurate analysis just of a small portion which need correct initial and boundary conditions. This goal can be achieved by means of a “cascade” of simulations performed in spatial and temporal domains which are progressively smaller, to obtain, gradually, an improved accuracy of results in the area and time interval of main interest. To do that, the analysis was divided into three main steps and we used a correlations toolbox (1° step) and then a set of one-dimensional (2° step) and three-dimensional (3° step) numerical tools.

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