News

Improved Cornering in Pathfinder 2015.2

October 21, 2015
Changes in the movement algorithms for Pathfinder 2015.2 have improved the cornering capabilities of occupants in high density, wide corridor turns. The cornering behavior seeks to steer agents so that they can take wide turns as part of a group without cutting in front of each other. Read More...

Training Events in Singapore, October 2015

October 14, 2015
The event "Best Practices for Fire Simulation: PyroSim and Pathfinder", will be hosted in Singapore at SCDF HQ, 91 Ubi Avenue 4, by our distribution partner Building System & Diagnostics Pte Ltd (BSD). Bryan Klein from Thunderhead Engineering will be presenting. Read More...

Advanced Up/Down Speed Properties

October 13, 2015
In the previous release, fundamental diagram customization added increased control over pedestrian movement by allowing users to define the relationship between speed and density. Pathfinder 2015.2 adds customization for stairs and ramps with independent up or down speed restrictions, and fundamental diagram customization. Read More...

Pathfinder 2015.2.1012

October 12, 2015
This update adds improved movement algorithms for group cornering and counterflow, separate speeds for moving up and down stairs, and import support for AutoCAD 2016. Read More...

Soot Deposition

October 6, 2015
FDS can model the deposition of smoke and aerosols onto solid surfaces. Deposition cannot be defined using the Simple Chemistry model, instead, it requires the use of the Complex Stoichiometry framework. Read More...

Viewpoints and Section Boxes for Better Perspective

September 14, 2015

PyroSim 2015.3 introduced two new tools to help engineers and their clients see the model in new ways. Viewpoints and section boxes, combined together to form a single view item, allow the user to save camera positions and clip geometry.

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Pathfinder: Merging Behavior on Stairs

September 9, 2015
During evacuation using stairs, the geometry of the stairs and landings can change the merging behavior. On the landing, the occupants entering from the floor must merge with the occupants already on the incoming stairs. This post discusses Pathfinder simulations of these effects. Read More...

Updated FDS Combustion and Fuel Composition Calculators

September 2, 2015
This post describes updated combustion product and fuel composition spreadsheet calculators for use with FDS (the Fire Dynamics Simulator from NIST). Read More...

FDS Fuel Composition for New Zealand C/VM2 – Verification Method Fire

August 20, 2015
This post has been corrected and updated. The updated post is here Updated FDS Combustion and Fuel Composition Calculators.   Daniel Swenson, Thunderhead Engineering    Read More...

Heat Release Rates of Burning Items in Fires

August 19, 2015
A paper by Hyeong-Jin Kim and David Lilley (Heat Release Rates of Burning Items in Fires, AIAA 2000-0722, January 2000) summarizes experimentally measured heat release rates for more than 60 different items that could be involved in fires. The data sets used by Kim and Lilley include FASTLite, HAZARD, and the Building and Fire Research Laboratory data sets. As part of preparing PyroSim examples, we developed a spreadsheet that calculates the heat release rates using the data and method described in the paper.  Read More...