Transcript DHS Scholars Internship Fire Research Division

DHS Scholars Internship
Fire Research Division
Tony Le, Drexel University
Advisor: Dr. Glenn Forney, NIST
August 13th, 2007
Fire Dynamics Simulator (FDS)

Command line based computational fluid
dynamics model of fire-driven fluid flow
 Based
on Navier-Stokes equations for lowspeed, thermally-driven flow
 Emphasis on smoke and heat transport from
fires

First created in February 2000
Computational Fluid Dynamics
Hot Upper Zone
Cool Lower Zone
Zone Fire Model
Field Model
- Divide into two zones
- Divide into small
volumes
- Ordinary differential
equation
-Partial differential
equations
Simulation Clip
Features of FDS

Hydrodynamic Model - Navier-Stokes
 Turbulence
treated by Smagorinsky form of
Large Eddy Simulation (LES)
Combustion Model – single step chemical
reaction tracked via a two-parameter
mixture fraction model
 Radiation Transport – finite volume
methods for convective transport

Features of FDS (cont.)
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Geometry – approximated governing equations
of a rectilinear mesh
Multiple Meshes – numerous rectangular
meshes used for calculations
Parallel Processing – numerous computers
using Message Passing Interface (MPI)
Boundary Conditions – solid surfaces are
assigned thermal boundary conditions
Linux Fire Cluster

Current System
 PERL
Script
 Current Load
 Temperature
 Usage

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User
Cumulative
 System
Status
Nagios – Network Monitoring

New System
 Notifications

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E-mail
SMS (Text Msgs)
 Temperature
 System
Status
 Interactive
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Plug-ins
Web-Based Services
FDS Graphical User Interface (GUI)

Ruby – WxRuby
SmokeView (SMV)

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Visualize numerical
predictions generated by
FDS
Displays time-dependent

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Traces particle flow
Animated contour slices of
computed gas variables
and surface data
Simulation Clip
SmokeView - OpenGL
Simulation Clip
3D Smoke – Animated Isosurfaces
Simulation Clip
Particle Animation
Simulation Clip
Temperature Slices
Simulation Clip
Boundary Temperature
Simulation Clip
Validation
Simulation Clip
Real World Models
NASA Vehicle Assembly Building
Kennedy Space Center
courtesy Rolf Jensen
Tank Fire Analysis
Combustion Science and Engineering
Parking Garage,
Courtesy of VTT, Finland
2006 Olympic Ice Hockey Stadium,
Turin, Italy, Courtesy of Arup
PyroSim, courtesy Thunderhead
Engineering Consultants, Manhattan, Kansas
Courtesy, Schirmer Engineering
World Trade Center Investigation
Kevin McGrattan, Chuck Bouldin, Glenn Forney
Simulation Clip
College Dorm Fire
Questions?
http://fire.nist.gov/fds/
http://www.pages.drexel.edu/~ttl28