CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Suction modeling

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 2, 2011, 15:55
Default Suction modeling
  #1
Senior Member
 
hamid
Join Date: Nov 2010
Posts: 185
Rep Power: 15
hamid1 is on a distinguished road
Hi

I am modeling a suction inside a pipe, suction happens via a narrower pipe which is located inside a wider pipe,

Could anybody let me know if suction could be modeled through Fluent and if so, then which kind of B.C. should be used, is pressure outlet is ok, and should I put a negative amount for that (the pressure outlet)?

what is the maximum amount for Reynolds that I can use laminar flow inside the pipe, and if I am more than that threshold but less than 2300 (critical amount for turbulant regime inside a pipe), which model should I use, laminar or Turbulant?

thanks alot i advance
hamid1 is offline   Reply With Quote

Old   January 3, 2011, 18:58
Default
  #2
Senior Member
 
hamid
Join Date: Nov 2010
Posts: 185
Rep Power: 15
hamid1 is on a distinguished road
please, could anybody reply me, it is very important for me, thanks all
hamid1 is offline   Reply With Quote

Old   January 3, 2011, 22:21
Default
  #3
Senior Member
 
Real Name :)
Join Date: Jan 2010
Location: United States
Posts: 192
Rep Power: 16
ComputerGuy is on a distinguished road
Suction is simply a lower local pressure condition (there's nothing special about outward flow or inward flow).

As such, using a pressure outlet boundary condition is fine. The "inlet" condition can be pressure as well; setting it to 0 Pa and the outlet to -100 Pa (for example) will cause an outflow (suction).

If you have a Re < 2100, you can be reasonably certain that the flow is laminar.


ComputerGuy
ComputerGuy is offline   Reply With Quote

Old   January 5, 2011, 02:52
Default
  #4
Senior Member
 
hamid
Join Date: Nov 2010
Posts: 185
Rep Power: 15
hamid1 is on a distinguished road
Thanks ComputerGuy, it helped me to be more sure about my work, thanks again...
hamid1 is offline   Reply With Quote

Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
mesh around suction hole morteza08 ANSYS Meshing & Geometry 0 August 18, 2010 08:48
suction boundary condition for a synthetic jet morteza08 FLUENT 0 August 18, 2010 08:48
suction boundary conditions morteza08 Main CFD Forum 0 August 18, 2010 08:47
Modeling Suction Shafa FLUENT 0 June 23, 2006 08:04
Modeling Flow/Saturation/Absorption in Fibers Gene Dougherty Main CFD Forum 0 June 6, 2003 15:49


All times are GMT -4. The time now is 10:01.