Home Home
Help  HelpSearch  SearchCalendar  Calendar
Welcome, Guest. Please login or register.
Did you miss your activation email?



Search:     Advanced search
*
+  Thunderhead Engineering
|-+  Public Forum
| |-+  PyroSim
| | |-+  how to see the water sprinkling.
Pages: [1]
Topic: how to see the water sprinkling.  (Read 135 times) Print
changzhoushusheng
Position: New Member
*

Posts: 13
« on: June 25, 2010, 04:26:53 AM »
in the simulation, i can not see the warter sprinkling from sprinkler in the demo by smokeview, just the change of the fire smaller.does it really can not be seen,or how can i see the water sprinkling.perhaps there are some settings in the animation demo.

thank you
 IP: [ Logged ] View Profile Email
Charlie Thornton
Group: Thunderhead
*****

Posts: 207
« Reply #1 on: June 25, 2010, 08:41:09 AM »
Are you sure the sprinkler is activating?  That the problem that usually gets me.  Once it''s spraying particles, they should be shown in smokeview as soon as you load the particles (attached).

Here''s the test file I used to generate that output.  It''s based on the "sprinkler_many.fds" verification problem, but I only used 1 sprinkler and moved it to the top center.  You can just past the text below into PyroSim and run it.

Code:
&HEAD TITLE=''many sprinkler case SVN $Revision: 2722 $''/
&TIME T_END=10.00/
&DUMP NFRAMES=200/

&MESH ID=''Mesh'', IJK=32,32,64, XB=0.00,1.60,0.00,1.60,0.00,3.20/

&PART ID=''water'',
      WATER=.TRUE.,
      SAMPLING_FACTOR=1/

&PROP ID=''Acme Sprinkler_Acme Sprinkler'',
      QUANTITY=''SPRINKLER LINK TEMPERATURE'',
      ACTIVATION_TEMPERATURE=74.00,
      RTI=50.00,
      PART_ID=''water'',
      FLOW_RATE=5.00,
      DROPLET_VELOCITY=5.00,
      SPRAY_ANGLE=50.00,55.00/
&DEVC ID=''sprinkler_1'', PROP_ID=''Acme Sprinkler_Acme Sprinkler'', XYZ=0.80,0.80,3.00, INITIAL_STATE=.TRUE./
&VENT SURF_ID=''OPEN'', XB=1.60,1.60,0.00,1.60,0.00,3.20, COLOR=''INVISIBLE''/ Vent #2
&VENT SURF_ID=''OPEN'', XB=0.00,1.60,0.00,0.00,0.00,3.20, COLOR=''INVISIBLE''/ Vent #3
&VENT SURF_ID=''OPEN'', XB=0.00,1.60,1.60,1.60,0.00,3.20, COLOR=''INVISIBLE''/ Vent #4
&VENT SURF_ID=''OPEN'', XB=0.00,0.00,0.00,1.60,0.00,3.20, COLOR=''INVISIBLE''/ Vent #1
&VENT SURF_ID=''OPEN'', XB=0.00,1.60,0.00,1.60,3.20,3.20, COLOR=''INVISIBLE''/ Vent #5
-------------------------------

* sprinkler.png (52.49 KB, 656x517 - viewed 10 times.)
 IP: [ Logged ] View Profile Email
changzhoushusheng
Position: New Member
*

Posts: 13
« Reply #2 on: June 29, 2010, 06:34:55 AM »
  ah? thank you very much, i got it, and,can i make the water sprinkling like the fire-fighting lance does, i mean that the rate of flow is very very big, so i can not only simulater the fire process but also the scene of fire rescuing, just the fire fighting truck at the ground of the firing building...put out the fire with the "fire-fighting lance(sprinkler)"...
  can i do that?  maybe the key of the problem is the shape of nozzle ?
 IP: [ Logged ] View Profile Email
Charlie Thornton
Group: Thunderhead
*****

Posts: 207
« Reply #3 on: June 29, 2010, 08:26:27 AM »
I know you can modify the sprinkler settings (e.g. orientation = direction of spray), but the answers might be questionable.  Read the FDS Users Guide, section 11.1.3 "Special Topic: Flame Extinction".  Evidently, the physical processes during extinction tend to be much smaller than the mesh resolution and as a workaround they use a simplified suppression algorithm.
 IP: [ Logged ] View Profile Email
« previous next »
Print
Pages: [1]  
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!
Theme © Copyright by Electron Inc