Fire dynamics simulator, making obstructions

AI Thread Summary
Creating non-rectangular obstructions in the Fire Dynamics Simulator (FDS) can be challenging, especially for circular shapes like chimneys. Users are exploring methods to define curved obstructions by using pairs of obstructions to approximate the desired shape. The discussion highlights the potential for simplifying the process, possibly through alternative software tools or techniques, such as Excel for modeling curves. Additionally, there is interest in incorporating heat-absorbing objects within the simulation. Overall, participants are seeking efficient solutions for modeling complex geometries in FDS.
jehan60188
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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
also, can i insert a pot (or some general object that absorbs heat?)
 

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