News

Wind Influence in Numerical Analysis of NSHEV Performance

September 24, 2018
This paper treats on the subject of including wind as a boundary condition in CFD analysis used in Fire Safety Engineering. Adverse wind effect is observed mostly on the performance of natural smoke and heat ventilators – and often is included in numerical studies performed by engineers. This paper provides with general guidelines on the Computational Wind Engineering, as well as to relevant references. Paper emphasizes on the necessity of building large enough domain and performing an angle sensitivity analysis, to determine the worst wind conditions for the vents. Only then the fire-related CFD/CWE coupled analysis may be performed, with reasonable and believable results. Read More...

Uncoordinated egress – An Experiment

September 23, 2018
The use of premixed flames in hot smoke tests present valuable advantages in comparison with traditional methods. The definition and control of the necessary power, HRR, is a great challenge due to the lack of information about the plumes originated by premixed flames. This work presents a method to simulate the hot smoke testing system Izar in FDS an calculate the temperature field within the created plume. Read More...

Simulation of Premixed Flames with FDS – Application to the Hot Smoke Testing System Izar

September 23, 2018
The use of premixed flames in hot smoke tests present valuable advantages in comparison with traditional methods. The definition and control of the necessary power, HRR, is a great challenge due to the lack of information about the plumes originated by premixed flames. This work presents a method to simulate the hot smoke testing system Izar in FDS an calculate the temperature field within the created plume. Read More...

FEMTC 2018 Early Registration Discount Ends Soon

August 10, 2018
Register for FEMTC 2018 before August 15th, 2018 and save $100. Read More...

Ramps in Pathfinder

August 10, 2018
This post demonstrates how to use straight and curved ramps in Pathfinder. Straight ramps are supported using the Create Ramp tool, while curved ramps require CAD import and use of the Extract Floor tool.  Read More...

New Camera Options in Results Viewer

August 6, 2018
Views, Tours, and Section Boxes can now be created directly within the Results Viewer. These objects can be trasnferred from one set of results to another via import. Also, screenshots can be automatically generated based on the views and tours that are created. Read More...

PyroSim 2018.2.0730

July 30, 2018
This release includes support for complex reaction stoichiometry, improved support for graphics hardware, and bug fixes. Changes to Results include creating views and section boxes, unit switching for concentration and temperature, and many other improvements. Read More...

Pathfinder 2018.3.0730

July 30, 2018
This release includes wait times on doors, an option for occupants to shrink to move through narrow aisles, and console-based generation of randomized simulations. Changes to Results include creating views and section boxes, unit switching for concentration and temperature, and many other improvements. Read More...

Changes to our Email System

July 14, 2018
If you would like to receive email messages from Thunderhead Engineering, please use the subscription form on this page. https://www.thunderheadeng.com/subscribe/ As individuals and as an organization we cringe at the idea of SPAM and sending people information that they do not want to look at. Which is why the new system has improved unsubscribe capabilities to ... Read More...

Experimental Study the Impact of Visibility on Individual Ascent Speed in Stair

July 13, 2018
An experiment was conducted in a 20-level building, where 120 participants were asked to walk upward in the stair in four kinds of visibility conditions (i.e., normal visibility condition, lighting-out condition, the condition of wearing 27% transmittance eye-patch and the condition of wearing 16% transmittance eye-patch). Their upward movement, ascent speeds and behaviors were recorded by cameras. Read More...