1. Title: Prevention methods development against aerosol terrorism for ventilation of Tbilisi subway
Grant N
Report - Numerical modeling of aerosol spread process in the Tbilisi Metro Ventilation System

2. Key personnel of the project Professor Omar Lanchava Dr Giorgi Nozadze
Dr Nino Arudashvili
Foreign consultants:
Professor Nikolae Ilias
Department of Mechanical Engineering, Industrial and Transport, University of Petrosani, Romania
Professor Roland Moraru
Vice-rector of University of Petrosani
Department of Mining, Surveying and Civil Engineering

4. General Technical Data of Tbilisi Metropolitan
Number of Tbilisi operating Metro stations - 23;
Total length km;
Average length of transverse tunnels m;
Transverse tunnel cross section - 16 m2;
The length of the stations m;
The capacity of the stations m3;
Depth of deployment of stations m;
Train composition Wagon;
The Wagon dimention – L0 = 19.2 m , b0 = 2.7 m , h0 =3.6 m;
 The maximum number of train pairs per Hour – 36.

5. Scenarios for the description of potential risks in the spread of hazardous aerosols for Metro Tbilisi
1. Entrance the Metropolitan till escalator tunnels - High risk;
2. Escalators tunnels- High risk;
3. Stations - High risk;
4. Wagons - High risk;
5. Ventilation hole to land surface - High risk.

6. The forming of tasks of numerical modeling the distribution of air flows with hazardous aerosols on the potential risk locations.
Determine the flow rate of the air in the tunnel of the subway (research of the impact of the piston effect);
Determination of ventilation air rate and determination of critical doses of the aerosols for worse ventilation scenarios for subway ventilation systems (stations, escalator tunnels, vestibules) in Tbilisi Metro;
Determining the rate of ventilation air flow in various metro wagons and determining the appropriate critical doses of aerosols.
 Determining the rate of absorbed air from the surface of the land by vertical duct hole and determining the appropriate critical dose of aerosols.
Determination of ventilation air flow rate caused by heat regimes and its impact on the distribution of critical dosages of aerosols.

7. Numerical modeling of piston effect ( In the soft PYROSYM 2016 )
Modeling options:
Length of the tunnel - L0 = m;
Cross section of the tunnel - S0 = 16 m2,
Train length - Ltr = m;
The size of the cross section of the train - Str = 4, 5, 6,25 m2
Modeling time seconds
The velocity of air flow in portal cross section - 6, 8, 10, 12 m / s
Lookup volum: Distribution of the flow rate in the tunnel

8. Results of numerical calculation
Train location in the tunnel
900 m
800 m
700 m
600 m

9. Results of numerical calculation
Train location in the tunnel m from portal

10. Results of numerical calculation
Train location in the tunnel m from portal

11. Train location in the tunnel 700 m from portal
რიცხვითი კვლევის შედეგები
Train location in the tunnel m from portal

12. Results of numerical calculation
Train location in the tunnel m from portal

13. Quasi-stationary nature of Piston effect including the turbulent zones

14. Results of numerical calculation
Velocity detectors data from portals and near the train cross section

15. Determination of flow rates during the piston effect
Train speed in metro tunnel Vftr m/s
Air flow relative velocity in the metro tunnel during the piston effect V'fp1,2
m/s
Air flow rates in the metro tunnel during the piston effect Q'1, m3 / s
Air flow Volume in the metro tunnel during the piston effect
Q'1, m3 1 7 16
2011 2 10 3 48
4224 12 4 64
4693 14 5
80*
5029
In the conditions of Tbilisi subway experimental calculation of Air rate
by piston effect was not more 100 m3 / s in traffic at 60 km / h

16. Depending of air flow rate on the train speed in the metro tunnel.

17. Thank you for your attention