News

The Use Of Pathfinder As An Evacuation Planning Tool: A Case Study In Concert Halls

June 12, 2017
Evacuation planning as part of fire safety management, is mandatory in Portugal for new and existing buildings. Estimating the egress time is paramount for the development of emergency evacuation plans. For this estimation, fire drills are undertaken. However, carrying out fire drills demands a certain amount of time and financial resources. In addition to that, fire drills might not be realistic for the worst case scenarios, such as having one or more exits blocked due to fires, or when other types of emergency situations are considered such as earthquakes or even terrorist attacks. For these reasons, a robust and validated People Movement (PM) model, such as Pathfinder, can be a very useful tool for emergency evacuation planning. Read More...

Study Of The Parameters That Influence The Behavior Of I-Girder Bridges During Fire Events

June 6, 2017
The structural response of bridges against fire is an under-researched topic not covered in current design codes in spite of its frequency and consequences. This paper uses Computational Fluid Dynamics simulations to study the parameters influencing the temperatures in the gas surrounding I-girder bridges during a fire since this is a critical parameter governing the response of the bridge. Read More...

A Comparative Study Of Fire Safety Provisions Effecting Evacuation Safety In A Metro Tunnel

May 23, 2017
This paper utilizes Computational Fluid Dynamics (CFD) and evacuation modeling to compare different evacuation configurations in a metro rail tunnel. Read More...

Stochastic Analysis Of Egress Simulations

May 19, 2017
The use of egress simulation models in performance-based analysis relies on the confidence in the input and output data. These data strongly depend on a large number of parameters. The study presented here focuses on the statistical aspects of these data, especially the population behavioral parameters which are the most likely to be scattered. The study proposes a method to analyze the statistical aspects of an egress simulation model. Read More...

Performance Of Optimization Algorithms For Deriving Material Data From Bench Scale Tests

May 17, 2017
In this work the performance of optimization algorithms for inferring material parameters for fire modeling from bench scale tests is compared to each other. Read More...

PyroSim Geometry from SketchUp

May 16, 2017
This screen cast covers a method that can be used to build a 3D model in SketchUp Make, and then export the geometry for use in PyroSim. Read More...

Ramps in PyroSim/FDS

May 16, 2017
This post shows how to draw a ramp in PyroSim, using triangular slabs to approximate the geometry. Ramps are useful when modeling parking garages or pedestrian walkways. Read More...

Heat Conduction in PyroSim/FDS

May 10, 2017
FDS assumes one-dimensional heat conduction into the surfaces of solid obstructions. With proper modeling, you can couple the front and back face temperatures of an obstruction so that heat flows through the obstruction. This post demonstrates heat transfer through obstructions, including radiative and convective fluxes on the surface.  Read More...

PetraSim 2017.1.0509

May 9, 2017
This release fixes bugs leading to incorrect output for sources, sinks, and wells.  Read More...

A UK Evacuation Case Study Using Pathfinder Questions The Suitability Of Fire Safety Guidance

May 2, 2017
A fire risk assessor in the UK inspected a seven story office building and suspected that it might be occupied by more people than guidance recommends. ... Pathfinder can give an answer to this apparent conundrum and can clearly depict how our assumptions of what takes place during an evacuation can be wrong. Read More...