FDS Tutorial
An A/B simulation that separates the compartment response from fuel suppression Abstract In a fire simulation, the heat-release-rate (HRR) curve can be specified by the user or emerge from a model of the burning material. That distinction matters when a sprinkler operates. Water can cool the gas and alter smoke movement, but a prescribed fuel […]
Prescriptive Provisions, Zone Models, CFD and Experiments There is no single best method in fire engineering. The right method depends on the question, the available information, the level of detail required and the consequences of being wrong. In practice, a project often starts with a simple question: Can the applicable fire safety rules already demonstrate […]
The following presents an example of mesh sensitivity analysis for an office fire scenario, aiming to evaluate how mesh resolution affects simulation results. Key Inputs: Characteristic Fire Diameter and Initial Mesh Selection Before running the simulations, the Characteristic Fire Diameter (D*) is calculated. This parameter provides a guideline for selecting an appropriate initial mesh size. […]
In Fire Dynamics Simulator (FDS), a mesh sensitivity study is the process used to verify that simulation results are controlled by the modeled fire physics rather than by the numerical resolution of the computational grid. This step is essential for any simulation intended to support engineering decisions, because an inadequate mesh can produce apparently reasonable […]
The Heat Release Rate (HRR) is the single most important variable in fire hazard analysis. It serves as the primary driver for all quantifiable fire effects, including compartment temperatures, smoke transport, and the activation of fire protection systems. This article explains how to calculate the Heat Release Rate (HRR) curve, a key variable in fire […]
The Fire Dynamics Simulator (FDS) User’s Guide is the primary reference for anyone performing computational fluid dynamics (CFD) simulations of fire-driven flows. It is comprehensive and authoritative, but its length and technical density can easily overwhelm new users. This article explains how to use the guide efficiently, which sections matter most at each stage, and […]
In this FDS example a simple radiator in a room is simulated. 1. Description In a room with dimensions of 4 x 3 x 3 m, the radiator is simulated by modeling obstruction with a high surface temperature. 2. Mesh The computational volume is divided into several meshes.The meshes increase in definition as their proximity to the radiator […]
This Mesh size calculator for FDS was originally developed by Kris Overholt (website). The script finds the optimal (Poisson-friendly) MESH division numbers and generate the MESH lines ready to be placed in the FDS input file. The FDS tool generate 3 different MESH lines corresponding to different resolutions (coarse, medium, fine). It will be up […]
In this FDS example a simple HVAC system in a room is simulated. 1. Description In a room with dimensions of 5.4 x 3.6 x 2.82 m, the HVAC system is simulated by introducing and extracting air. As you will see in the .fds file, the initial temperature is specified via the command & MISC […]
Through the following search bar it is possible to find articles, studies, experiments related to fire modeling and fire in general.The search engine was developed, with Google technology, to allow searches in the most important databases of scientific publications relating to the fire-fighting sector in the world. Search Engine – Fire related Articles and Studies […]