Create Elevators

August 21, 2013
In this video we show how to add elevators to a Pathfinder model.  Read More...

Pathfinder: Import a DWG File

August 20, 2013

This video demonstrates how to import a dwg file into Pathfinder and then create the Pathfinder evacuation model using the dwg geometry. If you want to follow the demo, install Pathfinder 2013 and download this dwg file (). Extract the *.dwg file.


Pathfinder: Getting Started

August 20, 2013

This video helps you get started with Pathfinder. The first 15 seconds help you install and license Pathfinder. The rest of the video guides you through an example that illustrates several of the features in Pathfinder, including: occupant profiles and behaviors, elevators, stairs, and display options.


Support for EOS7C Added

October 12, 2012
PetraSim now supports EOS7C, a TOUGH2 module for methane-carbon dioxide or methane-nitrogen gas mixtures. Applications include subsurface geologic carbon sequestration sites and natural gas reservoirs. The components modeled include water, brine, non-condensible gas (CO2 or N2), gas tracer, methane, and heat. If you want to be a beta tester, please contact Alison Alcott at RockWare (  Read More...

Create Spiral Stairs

August 21, 2012
This is a short video tutorial demonstrating a process that may be used to make circular or spiral stairs in Pathfinder. Read More...

PyroSim: ATF engineering analysis of a fire scenario resulting in a firefighter fatality.

July 20, 2012

The video below presents the ATF Fire Research Laboratory's Engineering Analysis of the fire that occurred at 30 Dowling Circle on January 19th, 2011. ATF Fire Protection Engineers were asked to utilize engineering analysis methods, including computer fire modeling, to assist with determining the route of fire spread and the events that led to the firefighter MAYDAY and subsequent Line of Duty Death of Firefighter Mark Falkenhan.


PetraSim 5.2.0611

June 11, 2012
This is a maintenance release of PetraSim 5. This version includes changes to the selection model and bug fixes to improve stability. Read More...

Water Spray Interaction with Dense Gas Clouds

May 7, 2012
Submission by: Robert N. Meroney, PhD. Wind Engineering Software, and Civil and Environmental Engineering, Colorado State University, Fort Collins, CO., USA Water spray curtains can provide an effective and rapid dilution mechanism for low lying dense clouds.  Frequently such clouds are released as a result of a chemical manufacturing, storage or gas transportation accident. Extensive field and laboratory tests have been performed to determine how well water curtains can mitigate actual spill conditions.  Numerical methods are often proposed to provide system design or timely response information, but most of these models reduce mathematical and computational complexity by integrating the equations of motion over volumes, sections or depths which provides computational speed but often sacrifices mixing detail and typically presume the use of empirical entrainment relationships.  Read More...

PyroSim 2012 Development Underway

December 8, 2011
Work is underway on the next version of PyroSim — PyroSim 2012. The release date is tentatively scheduled for some time in March 2012. The major noteworthy features are: Support for FDS 6 Improved tools for drawing and editing geometry Support for HVAC network modeling in FDS Improved CAD file import, including DWG format files Automatic partitioning of meshes for ... Read More...

PetraSim 5.1.2030

August 30, 2011
This release includes a workaround for a bug in the way TOUGH2's EOS9 module processes the ROCKS card when searching for REFCO. Read More...