Longitudinal Ventilation for Smoke Control of Urban Traffic Link Tunnel: Hybrid Field-network Simulation

The hybrid field-network simulation is proposed to solve the longitudinal control of smoke in an Urban Traffic Link Tunnel (UTLT). The topological structure of the flow distribution system of a typical UTLT and the coupling algorithm of field-network simulations are proposed. In case of longitudinal control of fire-induced smoke flow, the field-network simulation allows for full coupling of the regions of special interest (e.g., regions around fire and mechanical ventilators) and the whole UTLT domain. The hybrid field-network simulation provides both details of flow behavior of the key regions and bulk flow velocities of the rest of the system. This coupling methodology has low computational cost compared with full Computational Fluid Dynamics (CFD) model but provide enough accuracy. Longitudinal smoke control of UTLTs is demonstrated to be feasible using the hybrid field-network simulation.