CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

Pressure Boundary Conditions

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

LinkBack Thread Tools Search this Thread Display Modes
Old   July 10, 2008, 13:06
Default Pressure Boundary Conditions
Posts: n/a
Hi all,

I have a rectangular inlet and two rectangular outlets. I am using the pressure inlet and pressure outlets BCs.

I know the mass flows, in and out, at the boundaries. For these mass flows, initially I plotted the total pressure and Static Pressure Contours. As a next step, the mass flow boundary conditions are replaced by pressure boundary conditions and I used the plotted pressure values to get the initial mass flow rates(Total pressure as input at Pressure Inlet and respective Static Pressures as inputs at the two outflows). Can I expect to get the initial mass flow rates with which I started the problem?(Actually I am trying to verify my solution)

Because what happened is when I checked the velocity vectors, air is actually flowing 'into' one of the outlets. Also I didn't get the initial mass flow rates at the outlets. Inlet is working fine.

Could some one please help to make the flow 'out' from the outflow and with the mass flow rates at the outlets?

Thank you.
  Reply With Quote

Old   August 10, 2008, 04:07
Default Re: Pressure Boundary Conditions
Posts: n/a
let the outflow be solved by the pressure condition then take an integral of inflow and outflows. after that you can multiply the outflows by the fraction you expect. else you should let the pressure define it itself. former is the best way warrant continuity in the computational field.
  Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
mass flow in is not equal to mass flow out saii CFX 12 March 19, 2018 05:21
Implementation of boundary conditions for FVM Tom Main CFD Forum 7 August 26, 2014 05:58
Pressure Boundary Conditions Dave FLUENT 2 June 8, 2009 17:05
pressure boundary conditions A.Shaija Main CFD Forum 0 June 30, 2006 00:51
How to Define Pressure Boundary Conditions? Sheenu Main CFD Forum 4 May 12, 2000 12:52

All times are GMT -4. The time now is 12:43.