News

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...

Heat Conduction in PyroSim/FDS

May 10, 2017
FDS assumes one-dimensional heat conduction into the surfaces of solid obstructions. With proper modeling, you can couple the front and back face temperatures of an obstruction so that heat flows through the obstruction. This post demonstrates heat transfer through obstructions, including radiative and convective fluxes on the surface.  Read More...

PetraSim 2017.1.0509

May 9, 2017
This release fixes bugs leading to incorrect output for sources, sinks, and wells.  Read More...

A UK Evacuation Case Study Using Pathfinder Questions The Suitability Of Fire Safety Guidance

May 2, 2017
A fire risk assessor in the UK inspected a seven story office building and suspected that it might be occupied by more people than guidance recommends. ... Pathfinder can give an answer to this apparent conundrum and can clearly depict how our assumptions of what takes place during an evacuation can be wrong. Read More...

Te Papa Museum Design Review and Update

April 24, 2017
Te Papa Tongarewa, the national museum of New Zealand, stretched the bounds of fire engineering design when it was built. Designed at a time when fire zone models and nodal evacuation simulations were on the forefront of fire engineering design, the building represented a heavily engineered approach to fire safety with a complex array of fire safety systems. This paper outlines the case study of a reassessment of the museum using computation fluid dynamics and agent based evacuation modeling. Read More...

Advances in Simulation Capability for Complex Geometry

April 18, 2017
We describe our effort on the enhancement of fire simulation capability around complex geometry within the Fire dynamics Simulator (FDS). Read More...

Using PyroSim/FDS to Maximize Solar Panel Convective Cooling

April 18, 2017
Solar panels are most efficient if they operate at lower temperatures. We are installing solar panels on a workshop roof and the question arose, "What is the best solar panel spacing to maximize solar panel convective cooling?" This post uses PyroSim and FDS to evaluate some different solar panel mounting options to maximize solar panel convective cooling.  Read More...

PetraSim 2017.1.0405

April 5, 2017
This release includes bug fixes for Petrel grid import and maximum available sources and sinks. Read More...

Subway Station Passenger Movement using Pathfinder

March 27, 2017
This post demonstrates how to use Pathfinder to simulate movement in a subway station, with trains arriving and departing from the station. A growing list of features not specific to evacuation, such as occupant sources and assisted evacuation, make Pathfinder applicable to a much broader range of pedestrian movement problems. Read More...

One-Dimensional Model of Pyrolysis and Ignition of Medium Density Fiberboard Subjected to Transient Irradiation

March 7, 2017
Medium density fiberboard (MDF) is an engineered wood product that is widely used in the interior design of buildings and in furniture because of its good performance, ease of use and cost efficiency. However, like all wood products, MDF poses a fire risk. While the literature contains a lot of studies for wood pyrolysis and burning, MDF has not been thoroughly investigated yet. In this work, we study the pyrolysis of MDF subjected to transient irradiation in the form of parabolic pulses. While the majority of studies in literature employ a constant heat flux, we use transient irradiation to obtain a more comprehensive case. Read More...