News

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...

PyroSim 2015.3.0810

August 10, 2015
This release includes expanded OpenMP threading support in FDS, a new lighting model in Smokeview, and options to save views and clip geometry. Read More...

Import Fire and Smoke Slices into Evacuation Results

July 7, 2015
Slices are results recordings that capture user-defined planar slices of information. This allows the user to spend minimal processing time recording important areas of analysis. Read More...

Circulation Movement in a Cafeteria

June 23, 2015
Circulation-based simulations can be approximated through some advanced techniques in Pathfinder. This article will illustrate these techniques through a comparatively simple example. Read More...

PyroSim 2015.2.0604

June 4, 2015
This release fixes problems working with vents and fixes problems resetting the view to the correct bounds. Read More...

Pathfinder 2015.1.0520

May 22, 2015
This update fixes translation issues associated with the previous release.  Read More...

Pathfinder 2015.1.0515

May 15, 2015
This update of Pathfinder adds support for dynamic contours in the 3D results, user control of the fundamental diagram, and improved occupant movement. Read More...