News

WIND in PyroSim

February 6, 2018
FDS version 6.6.0 added a new WIND namelist to describe wind and atmospheric conditions. Support for WIND was included in PyroSim 2018.1. This post demonstrates this feature.  Read More...

Multiple Fuels with PyroSim

January 15, 2018

Updated Information Available

PyroSim 2018.2 now supports complex stoichiometry in the user interface. The post Complex Stoichiometry in PyroSim updates and replaces the contents of this post.
PyroSim's design assumes that most users want to use FDS with a single-fuel, "simple chemistry" combustion model. For simulations requiring multiple fuel species, a few extra steps are required. This post demonstrates how to perform a multiple-fuel simulation using PyroSim.  Read More...

Pathfinder 2018.1.1220

December 20, 2017
This release adds support for movement groups, parameters to control which occupants will automatically use stairs and elevators, built-in libraries of profiles, and expanded support for FDS results in 3D Results. Read More...

Results Viewer Released in PyroSim 2017.2

November 15, 2017
PyroSim now installs a new results viewer to further integrate Pathfinder evacuation simulations, CAD model textures, and camera tours designed in PyroSim. Read More...

PyroSim 2017.2.1115

November 15, 2017
This update includes additional support for FDS features including leakage, linear device arrays, and advanced HVAC records; reliability improvements for local parallel FDS simulations; and a new default results viewer. Read More...

Importing FDS Validation Examples into PyroSim

October 23, 2017
The FDS validation suite compares FDS (Fire Dynamic Simulator) results with experimental data. These examples cover most of the features of available in FDS. When you want to use a new feature in FDS, you can speed your learning by reviewing how the feature was used in a validation example. This post shows how you can quickly import the FDS model into PyroSim.  Read More...

PetraSim 2017.1.0828

August 28, 2017
This release fixes problems with the HydrateResSim user interface, improves Petrel import support, and fixes crashes related to viewing results.  Read More...

Pathfinder at People Movement and Management Show

July 31, 2017
In July of 2017, Thunderhead participated in the People Movement and Management Show held in Derby, UK. Our goal was to introduce Pathfinder to the people movement audience. Pathfinder was originally developed for emergency evacuation simulation as a companion product to PyroSim, our fire simulator. But we are adding features that will make it possible ... Read More...

Smoke Visibility and Obscuration in PyroSim

June 19, 2017
Smoke visibility and obscuration are critical outputs of a fire simulation. This post reviews how visibility is calculated in FDS, compares the calculation to experimental data, and discusses how smoke is visualized in the new PyroSim Results Viewer and in Smokeview. The comparison of VTT experimental images with predicted smoke visualization using PyroSim/FDS shows remarkably good correlation.   Read More...

Ramps in PyroSim/FDS

May 16, 2017
This post shows how to draw a ramp in PyroSim, using triangular slabs to approximate the geometry. Ramps are useful when modeling parking garages or pedestrian walkways. Read More...