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-   -   Fire Sprinkler simulation (http://www.cfd-online.com/Forums/cfx/86210-fire-sprinkler-simulation.html)

hup_cheng March 17, 2011 02:18

Fire Sprinkler simulation
 
Hi all,
I am very new to this Ansys CFX software. As the title, i want to simulate water distribution for fire sprinkler in a room. I have done through some tutorial in the example but i cant manage to get my simulation right.

i am using multiphase for domain combination of water and air. for the input, the fraction of water is 1 while for the air is 0. output is at the floor.

the streamline result only show velocity at the sprinkler but not reaching the floor of the room.

i hope anybody can enlighten me in this simulation. is there any important setting that i left out? if there is a tutorial close to this simulation, let me know.

thanx.

ghorrocks March 18, 2011 07:47

How are you modelling the multiple phases? Particle tracking or eularian?

hup_cheng March 19, 2011 02:06

i believe it is particle tracking..

ghorrocks March 20, 2011 21:55

Can you post an image of what you are seeing?

hup_cheng March 21, 2011 03:25

finally i solved the problem.. it is due to the initial condition of the domain..
but now my problem is the flow of the water is like bended.. its not falling in a straight line.. any idea what causes it?

http://img6.imageshack.us/img6/3718/54970788.jpg
http://img190.imageshack.us/img190/3482/33391457.jpg

ghorrocks March 21, 2011 20:20

Quote:

its not falling in a straight line.. any idea what causes it?
Umm, isn't that why you are doing a CFD model? Isn't it bending because the air flow bends it?

hup_cheng March 22, 2011 02:51

but the condition of the air speed has been set to 0.. plus i only want to study the design of sprinkler distribution cap neglecting the air movement..
im still exploring cfx to get better result presentation..
thanx alot.. :)

ghorrocks March 22, 2011 07:55

The water droplet will drive a flow. If you want to disable the flow then use an expert parameter "solve fluids=f" then it will not update the fluid flow field.

nilambar October 16, 2012 03:41

hi..
 
Quote:

Originally Posted by hup_cheng (Post 300290)
finally i solved the problem.. it is due to the initial condition of the domain..
but now my problem is the flow of the water is like bended.. its not falling in a straight line.. any idea what causes it?

http://img6.imageshack.us/img6/3718/54970788.jpg
http://img190.imageshack.us/img190/3482/33391457.jpg

very nice work. will you help me for simulation in tunnel fire. how i start in CFX ?
thanks with best regards

ghorrocks October 16, 2012 06:26

Do the tutorials, do some training, read the textbooks and do a literature search. And every once in a while put a post on the forum and we will try to help too.

nilambar October 18, 2012 00:05

hi
 
plz suggest some text books..

ghorrocks October 18, 2012 05:49

Any text book with "introduction" and "CFD" is a good start.

Here's a few, there are many more: http://www.cfd-online.com/Books/brow...?category_id=1

nilambar October 19, 2012 02:54

thanks for suggestion...


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