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

pressure

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   February 6, 2012, 05:50
Default pressure
  #1
Senior Member
 
hamid
Join Date: Nov 2010
Posts: 185
Rep Power: 6
hamid1 is on a distinguished road
Hi
I understand that minus pressure in the boundary means a suction pressure, but what does minus pressure inside the domain mean?
hamid1 is offline   Reply With Quote

Old   February 6, 2012, 10:32
Default
  #2
New Member
 
ANTONY AROUL RAJ V
Join Date: Jan 2012
Location: Chennai
Posts: 16
Rep Power: 5
ANTONY A R V is on a distinguished road
A localised region having vaccuum or pressure less than atmospheric pressure
ANTONY A R V is offline   Reply With Quote

Old   February 7, 2012, 13:07
Default
  #3
Senior Member
 
hamid
Join Date: Nov 2010
Posts: 185
Rep Power: 6
hamid1 is on a distinguished road
what does vacuum exactly mean?
if I consider my system in vacuum (there is no pressure from outside the system) and
regarding to the simulation based on the b.c. why should we care about the atmosphere, this is my issue getting confused of many times in simulation by Fluent,
what i want to simulate is a T shaped tube (with three openings), in two openings the pressure is known (there is a pressure from outside to inside the domain),
also in the third opening there is a suction implied by a vaccume system or a syringe, (so minus pressure),...
so i put 100 pa and 100 pa for the first two openings and -100 pa for the third opening......
hamid1 is offline   Reply With Quote

Old   February 20, 2012, 12:53
Default
  #4
New Member
 
ANTONY AROUL RAJ V
Join Date: Jan 2012
Location: Chennai
Posts: 16
Rep Power: 5
ANTONY A R V is on a distinguished road
A negative pressure means pressure less than atmospheric. You may have this at the suction side of fan and pump. This gauge pressure may be negative. but absolute pressure will be positive. The negativeness is relative to atmospheric pressure.
ANTONY A R V is offline   Reply With Quote

Reply

Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 06:27
Pressure instabilities with interDyMFoam for the floatingObject case nbadano OpenFOAM Running, Solving & CFD 14 March 8, 2011 09:19
Using pressure outlet BC Shreyansh FLUENT 0 November 5, 2010 15:57
Help ASAP! pressure inlet & outlet engahmed FLUENT 0 June 13, 2010 15:33
Setting pressure and velocity in inlet Asghari FLUENT 5 September 22, 2006 13:23


All times are GMT -4. The time now is 09:55.