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.


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.


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...

Fundamental Diagram Customization in Pathfinder

May 14, 2015
Pathfinder allows engineers to define a fundamental diagram used in their simulation to provide an accurate understanding of their results. Read More...

Contour Plots for Advanced Visualization in Pathfinder

May 14, 2015
Pathfinder allows the creation of contour plots that can add data visualization overlays, such as occupant density, to the floor surfaces of your model for a quick and easy to understand view of simulation results. Read More...

PetraSim 2015.2.0430

April 30, 2015

This release of PetraSim improves support for TOUGHREACT and TOUGH2-MP and includes several bug fixes.


PyroSim Mesh Tools

April 17, 2015
This quick tip goes over a few of the available features in PyroSim for Meshes. Read More...

Modeling Jet Fans, Part 3 (now replaced by new post): Applications

April 12, 2015
In this post we use the FDS and the┬áDynamic Smagorinsky turbulent viscosity model to simulate both a full-scale jet fan experiment and clearing of smoke from a car park garage. Read More...