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Old   March 17, 2011, 02:18
Default Fire Sprinkler simulation
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apis cheng
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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.
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Old   March 18, 2011, 07:47
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How are you modelling the multiple phases? Particle tracking or eularian?
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Old   March 19, 2011, 02:06
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i believe it is particle tracking..
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Old   March 20, 2011, 21:55
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Can you post an image of what you are seeing?
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Old   March 21, 2011, 03:25
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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?



Last edited by hup_cheng; March 22, 2011 at 14:29. Reason: edit pics
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Old   March 21, 2011, 20:20
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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?
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Old   March 22, 2011, 02:51
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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..
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Old   March 22, 2011, 07:55
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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.
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Old   October 16, 2012, 03:41
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Nilambar Bariha
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Quote:
Originally Posted by hup_cheng View Post
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?


very nice work. will you help me for simulation in tunnel fire. how i start in CFX ?
thanks with best regards
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Old   October 16, 2012, 06:26
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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.
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Old   October 18, 2012, 00:05
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Nilambar Bariha
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plz suggest some text books..
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Old   October 18, 2012, 05:49
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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
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Old   October 19, 2012, 02:54
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thanks for suggestion...
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