News

Mesh Techniques And Uncertainty For Modelling Impulse Jetfans

July 12, 2018
This study presents the numerical modelling of a jetfan stream using an open source Computational Fluid Dynamics (CFD) software named Fire Dynamics Simulator (FDS) 6.5.2. The software is based on an accurate turbulence model named Large Eddy Simulation (LES) along with a structured mesh to discretize the numerical domain. This research is focussed on the feasibility and accuracy of modelling jetfans using FDS, where a simplified three-dimensional model is built to represent a single jetfan in an open-deck car park, to compare the air jet downstream of the jetfan using various mesh techniques. Read More...

Use of Evacuation Simulation to Develop a Disaster Management Plan in Super Tall Buildings

July 12, 2018
This disaster management planning approach has been applied in a 123 stories super tall building located in Seoul, Korea. The purpose of this paper is to provide an overview of Pathfinder simulation application and propose a creative utilization to develop a disaster management plan in a super tall building project. Read More...

Evacuation Conditions In A Subway Stations With Platform Screen Doors

July 6, 2018
The aim of the paper is to carry out a comparison with and without platform screen doors in terms of evacuation conditions during a fire event. This way, it is possible to quantify and compare visibility, temperature, CO concentration and other variables in the evacuation routes. Read More...

A Method Of Smoke Dispersion Modelling Of Exhausted Tunnel Fire Smoke In Urban Areas

July 5, 2018
This paper outlines a method for using Fire Dynamics Simulator (FDS) for modeling smoke dispersal analyses (SDA) in urban and suburban areas, setting up wind parameters and determining wind effects on exhausting tunnel smoke from underground ventilation shafts. Read More...

Monte Carlo Simulations in Pathfinder

June 20, 2018
Pathfinder 2018.3 will include basic monte carlo simulation tools to automate multiple simulations where the initial positions and properties of occupants are randomized. This post demonstrates this capability. Read More...

FEMTC 2018 – Registration is Open with a List of Presentations

June 7, 2018
FEMTC 2018 event registration and hotel reservation links are online. Accepted presentations are now listed on the webpage and there will be a NIST NFRL tour option available on day 3. Read More...

Leakage Modelling using Pressure Zones – Updated 2018-06

June 5, 2018
Leakage refers to the air that escapes through small gaps as a compartment is pressurized by a fire. Pressure zones can be used to model this effect. Read More...

Complex Stoichiometry in PyroSim

May 23, 2018
PyroSim version 2018.2 will support complex stoichiometry in the user interface. Previously, PyroSim supported the FDS single-fuel, "simple chemistry" combustion model but complex stoichiometry required some manual input by the user. This post demonstrates how the new user interface capability can be used to represent multiple fuels and other complex reactions. If you would like to test this beta version, contact support@thunderheadeng.com.  Read More...

Comparison Between The Human Reactions In A Simulacrum And In A Real Fire Situation

May 22, 2018
Human reaction to a fire situation in buildings depends on the characteristics of each individual, of the building and the actual emergency situation. To minimize the consequences of an emergency fire situation in a building, it is important to have a safe, orderly and rapid evacuation. For this purpose, the occupants should be trained to respond in an appropriate way. Therefore, it is necessary to assess whether simulacrums or fire drills are effective or not. Read More...

Change Behavior in Pathfinder

May 16, 2018
As of Pathfinder 2018.2, Behaviors can now dynamically change from one to another throughout the simulation. The new Change Behavior step allows the user to define a progression to one of the other Behaviors defined in the model. Read More...