NDLI: A Novel Multiscale Methodology for Simulating Tunnel Ventilation Flows During Fires

Content Provider	Springer Nature Link
Author	Colella, Francesco Rein, Guillermo Borchiellini, Roma Torero, Jose L.
Copyright Year	2010
Abstract	This paper applies a novel and fast modelling approach to simulate tunnel ventilation flows during fires. The complexity and high cost of full CFD models and the inaccuracies of simplistic zone or analytical models are avoided by efficiently combining mono-dimensional (1D) and CFD (3D) modelling techniques. A simple 1D network approach is used to model tunnel regions where the flow is fully developed (far field), and a detailed CFD representation is used where flow conditions require 3D resolution (near field). This multi-scale method has previously been applied to simulate tunnel ventilation systems including jet fans, vertical shafts and portals (Colella et al., Build Environ 44(12): 2357–2367, 2009) and it is applied here to include the effect of fire. Both direct and indirect coupling strategies are investigated and compared for steady state conditions. The methodology has been applied to a modern tunnel of 7 m diameter and 1.2 km in length. Different fire scenarios ranging from 10 MW to 100 MW are investigated with a variable number of operating jet fans. Comparison of cold flow cases with fire cases provides a quantification of the fire throttling effect, which is seen to be large and to reduce the flow by more than 30% for a 100 MW fire. Emphasis has been given to the discussion of the different coupling procedures and the control of the numerical error. Compared to the full CFD solution, the maximum flow field error can be reduced to less than few percents, but providing a reduction of two orders of magnitude in computational time. The much lower computational cost is of great engineering value, especially for parametric and sensitivity studies required in the design or assessment of ventilation and fire safety systems.
Starting Page	221
Ending Page	253
Page Count	33
File Format	PDF
ISSN	00152684
Journal	Fire Technology
Volume Number	47
Issue Number	1
e-ISSN	15728099
Language	English
Publisher	Springer US
Publisher Date	2010-02-24
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tunnel Ventilation systems Multiscale modelling CFD Jet fans Physics Characterization and Evaluation of Materials Mechanics Civil Engineering
Content Type	Text
Resource Type	Article
Subject	Materials Science Safety, Risk, Reliability and Quality

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Pulsations During Fires in Tunnels

Fire Dynamics Simulator (Version 4.0) Simulation for Tunnel Fire Scenarios with Forced, Transient, Longitudinal Ventilation Flows

Fire Spread Between Vehicles in Tunnels: Effects of Tunnel Size, Longitudinal Ventilation and Vehicle Spacing

Investigating the Throttling Effect in Tunnel Fires

Experimental and Theoretical Study for Tunnel Fires with Natural Ventilation

Experimental Study on the Influence of Different Transverse Fire Locations on the Critical Longitudinal Ventilation Velocity in Tunnel Fires

Numerical Simulation of the Howard Street Tunnel Fire

Ventilation Fan Fires: Overheated Windings Lead to Failed Thermal Limit Switch

Towards Design Options and Trade-offs for Road Tunnels Incorporating Suppression Systems

A Novel Multiscale Methodology for Simulating Tunnel Ventilation Flows During Fires

Similar Documents

Pulsations During Fires in Tunnels

Fire Dynamics Simulator (Version 4.0) Simulation for Tunnel Fire Scenarios with Forced, Transient, Longitudinal Ventilation Flows

Fire Spread Between Vehicles in Tunnels: Effects of Tunnel Size, Longitudinal Ventilation and Vehicle Spacing

Investigating the Throttling Effect in Tunnel Fires

Experimental and Theoretical Study for Tunnel Fires with Natural Ventilation

Experimental Study on the Influence of Different Transverse Fire Locations on the Critical Longitudinal Ventilation Velocity in Tunnel Fires

Numerical Simulation of the Howard Street Tunnel Fire

Ventilation Fan Fires: Overheated Windings Lead to Failed Thermal Limit Switch

Towards Design Options and Trade-offs for Road Tunnels Incorporating Suppression Systems

A Novel Multiscale Methodology for Simulating Tunnel Ventilation Flows During Fires