What is a fire model?


What is a fire model?

Fire modeling produces graphical representations of fire conditions (smoke concentration, temperature, flame position) that can effectively convey technical information to the layperson.

What is the purpose of fire modeling?

Computer fire modeling has been used to design and analyze fire protection systems (i.e. sprinkler systems, detection systems), evaluate the effects of fire on people and property, estimate fire risks, and assess postfire reconstruction.

What are different types of fire models?

The modeling approaches used are: a simplified analytical model of fire growth, a zone model (CFAST) and a field model (FDS).

When did fire modeling start?

HISTORY AND BASICS OF FIRE MODELING Many in the fire profession would state that the use of mathematics and science as applied to fire- related dynamics began in the early 1940’s (Nelson, 2002).

What is Zone modeling?

Zone models and lumped parameter models operate under the assumption that a given space can be broken into a small number of volumes, or “zones”, over which a number of algebraic equations are solved to determine the relevant flow properties.

What are field models?

Field models are used to calculate the values of field functions under given boundary and loading conditions. Field functions are physical quantities which depend on their geometrical location, such as temperature (a scalar field) or velocity (a vector field).

Which principle is used in fire fighting?

Fire extinguishing works on the principle of cutting off the supply of oxygen to the fire and bringing down the temperature.

How many smoke fire models are there?

Daysmoke consists of four sub-models: an entraining turret model, a detraining particle model, a large eddy parameterization for the mixed boundary layer, Page 4 4 and a relative emissions model that describes the emission history of the prescribed burn.

How is fire modeling used to combat wildfires?

Modeling allows fire managers to simulate prescribed fires in advance, so that when crews start laying down flames from drip torches across the landscape, they can confidently set the right fire at the right time. They want just enough fire to sustain itself but not so much that it gets out of control.

How do fires spread?

A fire can spread by radiation when the heat travels through electromagnetic waves in the air. When a fire breaks out, heat will travel in all directions until it reaches an object which will absorb it. When it reaches a combustible material, it will smoulder and eventually burn.

What is the most widely used computational fluid dynamics model?

In this capacity, Exponent uses the most widely used tools in fire modeling—the Fire Dynamics Simulator (FDS) and the Consolidated Model of Fire and Smoke Transport (CFAST)—which are developed and distributed by the National Institute of Standards and Technology.