Fire dynamics simulator, making obstructions

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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?
 
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also, can i insert a pot (or some general object that absorbs heat?)