Fire dynamics simulator, making obstructions

In summary, the conversation discusses the creation of obstructions in FDS that are not rectangular, specifically a circular chimney attached to a square base. The process involves using pairs of obstructions for the left and right sides, with a midsection and a circular chimney inside. The person also asks for thoughts on using excel to create a curved top and if a pot or other heat-absorbing object can be inserted.
  • #1
jehan60188
203
1
hey all,

Is there any easy way to make obstructions in FDS that aren't rectangular?
I basically want to tack on a circular chimney to the following


/basic floor
&OBST XB = 0,1.5,0,1.5,0,.1524 /

//the channel
&OBST XB = 0,1.5,0,.6,.1524,.5 /create an obstruction- right 'wall'
&OBST XB = 0,1.5,.9,1.5,.1524,.5 /create an obstruction- left 'wall'

//for the curved part
//obstructions come in pairs. the left and right side
//left side
//template: OBST XB = 0,1.5, 0, .6, .5, .6
//template OBST XB = 0,1.5, .9, 1.5, .5, .6
//right side
&OBST XB = 0,1.5, 0,0.6, 0.5, 0.553851648/
&OBST XB = 0,1.5, 0,0.61, 0.553851648, 0.574833148/
&OBST XB = 0,1.5, 0,0.62, 0.574833148, 0.59/
&OBST XB = 0,1.5, 0,0.63, 0.59, 0.60198039/
&OBST XB = 0,1.5, 0,0.64, 0.60198039, 0.611803399/
&OBST XB = 0,1.5, 0,0.65, 0.611803399, 0.62/
&OBST XB = 0,1.5, 0,0.66, 0.62, 0.626885775/
&OBST XB = 0,1.5, 0,0.67, 0.626885775, 0.632664992/
&OBST XB = 0,1.5, 0,0.68, 0.632664992, 0.637477271/
&OBST XB = 0,1.5, 0,0.69, 0.637477271, 0.641421356/
/*********midsection
OBST XB = 0,1.5, 0,0.7, 0.641421356, 0.644568323/
OBST XB = 0,1.5, 0,0.71, 0.644568323, 0.646969385/
OBST XB = 0,1.5, 0,0.72, 0.646969385, 0.648660687/
OBST XB = 0,1.5, 0,0.73, 0.648660687, 0.649666295/

OBST XB = 0,1.5, 0,0.74, 0.649666295, 0.65/
OBST XB = 0,1.5, 0,0.75, 0.65, 0.649666295/

OBST XB = 0,1.5,0.77,1.5,0.646969385,0.648660687/
OBST XB = 0,1.5,0.78,1.5,0.644568323,0.646969385/
OBST XB = 0,1.5,0.79,1.5,0.641421356,0.644568323/

********/
&OBST XB = 0,1.5,0.8,1.5,0.637477271,0.641421356/
&OBST XB = 0,1.5,0.81,1.5,0.632664992,0.637477271/
&OBST XB = 0,1.5,0.82,1.5,0.626885775,0.632664992/
&OBST XB = 0,1.5,0.83,1.5,0.62,0.626885775/
&OBST XB = 0,1.5,0.84,1.5,0.611803399,0.62/
&OBST XB = 0,1.5,0.85,1.5,0.60198039,0.611803399/
&OBST XB = 0,1.5,0.86,1.5,0.59,0.60198039/
&OBST XB = 0,1.5,0.87,1.5,0.574833148,0.59/
&OBST XB = 0,1.5,0.88,1.5,0.553851648,0.574833148/
&OBST XB = 0,1.5,0.89,1.5,0.5,0.553851648/

/midsection/
&OBST XB = 0,1.5,0,.65,.64,.75/
&OBST XB = 0,1.5,0.85,1.5,.64,.75/
&OBST XB = 0,.65,.65,.85,.64,.75/
&OBST XB = .85,1.5,.65,.85,.64,.75/

the chimney would be circular, and inscribed in the square. then, there'd be a circle inside of it, making the chimney have 10" thick walls

thoughts?

I made the "curved" top of the channel with excel, but I'm thinking there might be an easier way?
 
Engineering news on Phys.org
  • #2
also, can i insert a pot (or some general object that absorbs heat?)
 

1. What is a Fire Dynamics Simulator?

A Fire Dynamics Simulator (FDS) is a computer program used to simulate the spread of fire and smoke within a building or structure. It takes into account factors such as ventilation, fuel sources, and fire growth to create a realistic simulation of a fire scenario.

2. How does FDS help in understanding fire dynamics?

FDS uses computational fluid dynamics (CFD) to model the behavior of fire and smoke. This allows researchers and engineers to study the effects of different fire scenarios and mitigation strategies on the spread and behavior of fire in a controlled environment.

3. What role do obstructions play in fire dynamics?

Obstructions, such as walls, furniture, and other objects in a building, can affect the flow of fire and smoke. They can either block the spread of fire or act as fuel sources, contributing to the growth and intensity of a fire. FDS takes into account these obstructions to create a more accurate simulation of fire dynamics.

4. How does FDS handle complex building geometries?

FDS has the ability to handle complex building geometries, including irregularly shaped rooms, multiple levels, and different types of materials. This allows for a more realistic simulation of fire spread in real-world scenarios.

5. What are some practical applications of FDS?

FDS is used in a variety of industries, including fire safety, building design, and emergency management. It can be used to assess the effectiveness of fire protection systems, develop evacuation plans, and improve building designs to enhance fire safety. It is also used in research and development to study fire behavior and develop new firefighting techniques.

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