Fire dynamics simulator, making obstructions

Click For Summary
SUMMARY

The forum discussion focuses on creating non-rectangular obstructions in Fire Dynamics Simulator (FDS), specifically a circular chimney design. Users discuss the use of the &OBST command to define various obstructions, including curved shapes, by specifying coordinates. The conversation highlights the complexity of modeling curved structures and suggests using Excel for generating curved top designs. Additionally, participants inquire about incorporating heat-absorbing objects into the simulation.

PREREQUISITES
  • FDS 6.7 or later for advanced obstruction modeling
  • Understanding of the &OBST command syntax in FDS
  • Basic knowledge of geometric modeling for simulation
  • Familiarity with using Excel for design calculations
NEXT STEPS
  • Research advanced techniques for modeling curved obstructions in FDS
  • Explore the use of heat-absorbing materials in FDS simulations
  • Learn about the integration of complex geometries using CAD software
  • Investigate optimization strategies for FDS simulations involving multiple obstructions
USEFUL FOR

Fire safety engineers, simulation modelers, and researchers in fire dynamics looking to enhance their FDS modeling skills, particularly in creating complex geometries and incorporating thermal properties.

jehan60188
Messages
201
Reaction score
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
also, can i insert a pot (or some general object that absorbs heat?)
 

Similar threads

Graduate Do You Have What it Takes to Be a True Mathematician?
  • · Replies 21 ·
Replies
21
Views
4K