slide1
Download
Skip this Video
Download Presentation
D. Borello*, G.Giuli** and F. Rispoli*

Loading in 2 Seconds...

play fullscreen
1 / 24

D. Borello*, G.Giuli** and F. Rispoli* - PowerPoint PPT Presentation


  • 134 Views
  • Uploaded on

A CFD METHODOLOGY FOR FIRE SPREAD AND RADIATIVE EFFECTS SIMULATION IN LONGITUDINAL VENTILATION TUNNELS: APPLICATION TO THE MEMORIAL TUNNEL. D. Borello*, G.Giuli** and F. Rispoli* *DepartMent of Mechanics and Aeronautics University of Rome ‘La Sapienza’

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' D. Borello*, G.Giuli** and F. Rispoli*' - chana


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

A CFD METHODOLOGY FOR FIRE SPREAD AND RADIATIVE EFFECTS SIMULATION IN LONGITUDINAL VENTILATION TUNNELS: APPLICATION TO THE MEMORIAL TUNNEL

D. Borello*, G.Giuli** and F. Rispoli*

*DepartMent of Mechanics and Aeronautics University of Rome ‘La Sapienza’

**ENEA – Italian Agency for the Energy, the New Technologies and the Environment

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

index
INDEX
  • MOTIVATIONS
  • MEMORIAL TUNNEL DESCRIPTION
  • FLOW MODELS
  • NUMERICAL DETAILS
  • NUMERICAL CAMPAIGN

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

motivations
MOTIVATIONS
  • MAJOR INTEREST IN TUNNEL SAFETY AND POLLUTION CONTROL
  • EXPERIMENTAL RESULTS GIVE PARTIAL FLOW INFORMATION
  • DEVELOPING A NUMERICAL METHODOLOGY DEVOTED TO TUNNEL FLOW SIMULATION ABLE TO:
    • PREDICT THE FLOW BEHAVIOR IN OPERATING CONDITIONS
    • DESCRIBE THE FIRE SPREAD IN ORDER TO:
      • PREDICT MAIN FLOW PHENOMENA

BACK-LAYERING AND SMOKE DIFFUSION

      • DEFINE THE BEST VENTILATION CONFIGURATION IN

EMERGENCY SITUATIONS

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

slide4

MEMORIAL TUNNEL 1/5Memorial Tunnel Fire Ventilation ProgramMassachusetts Highway Department & Bechtel/Parsons Brinckerhoff, Massachusetts, November 1995

  • EXPERIMENTAL CAMPAIGN (1995)
    • LONGITUDINAL, TRANSVERSAL, MIXED CONFIGURATIONS
    • LONGITUDINAL CONFIGURATION :

15 JET FANS (in groups of three)

    • LENGTH: 853m, PASSAGE SECTION: 60.4 m2, SLOPE: 3.2 %
    • JET FAN: air velocity: 34.2 m/s, mass flow rate: 43 m3/s

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

memorial tunnel 2 5

NORTH

ROOM

SOUTH

ROOM

811 m

21.3m

853,7 m

4.33 m

Sect. A

Sect. B

0.91 m

0.76 m

Walkway

0.91 m

sect. A

sect. B

7.86m

7.86m

sect. B

sect. A

8.76 m

8.76 m

4.33 m

y

y

z

x

MEMORIAL TUNNEL 2/5
  • SECTIONS

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

memorial tunnel 3 5

1

4

853.7 m

2

5

3

6

0 m

95

190

285

379

474

615

N

o

r

t

h

S

o

u

t

h

Jet Fans Flow

x

Pan

z

ON

ON

Slope 3,2 %

10

13

14

11

15

12

7

8

9

MEMORIAL TUNNEL 3/5
  • PLANT

I

N

L

E

T

O

U

T

L

E

T

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

memorial tunnel 4 4
MEMORIAL TUNNEL 4/4
  • PANS

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

memorial tunnel 5 5
MEMORIAL TUNNEL 5/5
  • JET FANS

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

flow models
FLOW MODELS
  • 3-DIMENSIONAL, STEADY, TURBULENT REACTING FLOW
  • TURBULENCE MODELING
    • STANDARD k-e MODEL (Jones and Launder, 1988)
  • BUOYANCY MODELING
  • COMBUSTION MODELING
    • HEAT SOURCE PLACED IN THE FIRE LOCATION
  • RADIATION MODELING
    • IMMERSOL SYNTHETIC TREATMENT (Spalding, 1991)
    • NO RADIATION MODELING (Pucher et al., 2001)

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

numerics 1 2

R = 4.33 m

2.44 m

R = 2.1 m

1.575 m

3.48 m

8.76 m

Walkway

y

x

NUMERICS 1/2
  • COMPUTATIONAL GRID: 31 X 30 X 327 cells

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

numerics 2 2
NUMERICS 2/2
  • BFC GRIDS
  • GENERALISED CO-LOCATED SCHEME
  • SIMPLE SOLUTION SCHEME
  • FALSE TIME STEP RELAXATION FOR V and T
  • WALL ROUGHNESS : 3 mm

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

analysed test cases
ANALYSED TEST CASES
  • COLD FLOW TEST: (T-A)

– 15 JET FANS

  • T606A FIRE TEST (10 MW): (T-B, T-C)

– 2 JET FANS

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

numerical campaign 1 10 cold flow simulation
NUMERICAL CAMPAIGN 1/10COLD FLOW SIMULATION
  • OPERATING CONDITIONS:
    • 15 ACTIVE FANS
    • SWIRL NUMBER: 0.5
    • CONSTANT PROPERTIES GAS
    • WALL LAW FOR VELOCITY INSIDE THE TUNNEL
    • FREE BOUNDARY CONDITIONS IN INLET AND OUTLET
  • COMPARISONS

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

numerical campaign 2 10 fire simulation
NUMERICAL CAMPAIGN 2/10FIRE SIMULATION
  • TEST CASE T606A 10 MW
  • OPERATING CONDITIONS:
    • 2 ACTIVE FANS
    • SWIRL NUMBER: 0.5
    • IDEAL GAS
    • WALL LAW FOR VELOCITY AND TEMPERATURE
    • FREE BOUNDARY CONDITIONS IN INLET AND OUTLET
  • SYNTHETIC AND DIRECT RADIATION SIMULATION

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

numerical campaign 3 10 fire simulation
NUMERICAL CAMPAIGN 3/10FIRE SIMULATION
  • CRITICAL VELOCITY: 1.8 m/s (104 m3/s)
  • COMPARISONS

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

numerical campaign 4 10 fire simulation
NUMERICAL CAMPAIGN 4/10FIRE SIMULATION
  • COMPARISONS ( V and T PROFILES)
    • MEASUREMENT POSITIONS

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

numerical campaign 5 10 fire simulation

Pan

NUMERICAL CAMPAIGN 5/10FIRE SIMULATION
  • COMPARISONS ( T and V PROFILES)

L214 (18 m)

a)b)

V (m/s)

T (°C)

Loop 214 – Temperature (a) and velocity (b) profiles

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

numerical campaign 6 10 fire simulation

Pan

NUMERICAL CAMPAIGN 6/10FIRE SIMULATION
  • COMPARISONS ( T and V PROFILES)

L209 (321 m)

a)b)

T (°C)

V (m/s)

Loop 209 – Temperature (a) and velocity (b) profiles

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

numerical campaign 7 10 fire simulation

Pan

NUMERICAL CAMPAIGN 7/10FIRE SIMULATION
  • COMPARISONS ( T and V PROFILES)

L305 (604 m)

a)b)

T (°C) V (m/s)

Loop 305 – Temperature (a) and velocity (b) profiles

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

numerical campaign 8 10 fire simulation
NUMERICAL CAMPAIGN 8/10FIRE SIMULATION
  • COMPARISONS ( T and V PROFILES)

L302 (681 m)

Pan

a)b)

V (m/s)

T (°C)

Loop 302 – Temperature (a) and velocity (b) profiles

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

numerical campaign 9 10 fire simulation

Pan

NUMERICAL CAMPAIGN 9/10FIRE SIMULATION
  • COMPARISONS ( T and V PROFILES)

L202 (833 m)

a)b)

V (m/s)

T (°C)

Loop 202 – Temperature (a) and velocity (b) profiles

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

numerical campaign 10 10 fire simulation
NUMERICAL CAMPAIGN 10/10FIRE SIMULATION
  • T contours

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

conclusions
CONCLUSIONS
  • AN ACCURATE METHODOLOGY FOR FIRE SIMULATION IN TUNNELS HAS BEEN DESCRIBED
  • THE PREDICTION CAPABILITIES HAVE BEEN DEMONSTRATED IN CRITICAL FLOW CONDITIONS
  • SUCCESSFUL SIMULATION OF RADIATION PHENOMENA

International PHOENICS User Conference – 23-27 September, 2002 – Moscow

s gottardo 17 km switzerland 24 10 2001
S. GOTTARDO – 17 KmSwitzerland 24.10.2001

International PHOENICS User Conference – 23-27 September, 2002 – Moscow