Tutorials

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...

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...

Comparing FDS results to fire spill-plume calculations in BRE Annex D

August 4, 2016
The BRE guide Design methodologies for smoke and heat exhaust ventilation summarizes the advice available from the BRE Fire Research Station (UK)  to designers of atria and other buildings. Annex D of the BRE document compares different fire spill-plume calculation methods applied to a multistorey shopping mall. We compare Fire Dynamics Simulator (FDS) results to the calculations in Annex D.  Read More...

Critical Velocity in Tunnel Fires

May 17, 2016
Merve Altay contacted us with a tunnel model that was experiencing a numerical instability. He was simulating a set of experiments performed to evaluate the critical velocity in a tunnel fire. Answering his question eventually led to improvements in FDS and a better understanding of user applications of PyroSim/FDS.  Read More...

Modeling Jet Fans, Part 3: Car Park Simulation

April 11, 2016
In this post, we explore modeling jet fans to extract smoke from a car park using FDS. The jet fans are modeled using HVAC ducts with shrouds. Read More...

Modeling Jet Fans, Part 2: Validation using Experimental Data

April 11, 2016
It is not feasible┬áto simulate full scale parking garages with such a fine mesh, even if multiple meshes are used. This post discusses ways it may be possible to use a larger mesh size and still obtain meaningful results. Read More...

Velocity Patch in FDS

March 24, 2016
It is not feasible┬áto simulate full scale parking garages with such a fine mesh, even if multiple meshes are used. This post discusses ways it may be possible to use a larger mesh size and still obtain meaningful results. Read More...

Assign FDS Meshes to Specific MPI Processes

December 18, 2015
This feature allows additional MPI and OpenMP parameters to be added to each MESH line in PyroSim, without the need to export and edit the file by hand and run from the command line. Read More...

Freezing HRR in PyroSim

November 11, 2015
A common strategy when modelling a fire with sprinklers is to assume the fire will be held at a constant heat release rate (HRR) when the first sprinkler activates. This post shows how to do this by automatically "freezing" the HRR at a constant value when a sprinkler activates.  Read More...