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  Challenges regarding ventilation, aerodynamics and tunnel environmental control of the Stuttgart 21 project

  Stuttgart 21 (S21) is a railway project under construction in Germany. The existing Central Station in Stuttgart shall be transformed from an above-ground terminal station with 16 tracks to an underground through-station with 8 tracks. About 500 ha of downtown area will become cleared for urban development. A network of 30 km of mostly twin-tube, single-track, high-speed tunnels shall provide access to the new underground station. Particular design tasks are related to: - Smoke from fires shall be removed or kept away from the station and tunnels. - Pressure changes caused by trains running at up to 250 km/h need to be limited. - Thermal draft flows in inclined tunnels shall be acceptable. The urban setting, the combination of high-speed tunnels with underground stations and the complex interaction between ventilation, aerodynamics and tunnel environment shall be presented.

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