News

Changes to our Email System

July 14, 2018
If you would like to receive email messages from Thunderhead Engineering, please use the subscription form on this page. https://www.thunderheadeng.com/subscribe/ As individuals and as an organization we cringe at the idea of SPAM and sending people information that they do not want to look at. Which is why the new system has improved unsubscribe capabilities to ... Read More...

Experimental Study the Impact of Visibility on Individual Ascent Speed in Stair

July 13, 2018
An experiment was conducted in a 20-level building, where 120 participants were asked to walk upward in the stair in four kinds of visibility conditions (i.e., normal visibility condition, lighting-out condition, the condition of wearing 27% transmittance eye-patch and the condition of wearing 16% transmittance eye-patch). Their upward movement, ascent speeds and behaviors were recorded by cameras. Read More...

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...