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

Split boundary zone in FLUENT for mass flow

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

Like Tree1Likes
  • 1 Post By eishinsnsayshin

Reply
 
LinkBack Thread Tools Display Modes
Old   January 18, 2013, 13:19
Default Split boundary zone in FLUENT for mass flow
  #1
Member
 
Join Date: Jun 2011
Posts: 48
Rep Power: 4
eishinsnsayshin is on a distinguished road
Hey everyone,

I'm trying to track mass flow through the front of a box (basically) using FLUENT. Incompressible flow. Perfect box. Box has an inlet, outlet, and walls everywhere else. So this will sound strange but I really only want the mass flow through the "inlet" of the box. It sounds strange because you're probably thinking the mass flow through the front and back of the box should be the same. And they will be...

The problem is that the inlet and outlet of the box are actually set as the same name. Lets say they're both called "inlet" in FLUENT. So if I track the mass flow through the surface "inlet" I will get exactly twice what the answer should be. So it shouldn't be an issue... I'll just divide what fluent gives me by 2. Buuuut it turns out the normal directions on the front and back surfaces of the box are opposite each other, so when I look at mass flow through the surface "inlet", I actually just get zero.

So to solve this now, I actually want to be able and take part of my surface "inlet" (either the upstream or downstream face) and rename it, so that the front and back of the box are both called something different.

Is there a way to do this exclusively in FLUENT? Maybe by x location or something? The reason is that this is a converted OpenFOAM case whose mesh was created using snappyhexmesh. All I was given is the fluent case file and have access to nothing else.

The only other option I can think of is to somehow reverse the normal direction on either the front or back face of surface "inlet", so I can divide by 2.

Is this even possible?

Thanks for any ideas!!!
eishinsnsayshin is offline   Reply With Quote

Old   January 18, 2013, 13:43
Default
  #2
Member
 
Join Date: Jun 2011
Posts: 48
Rep Power: 4
eishinsnsayshin is on a distinguished road
Uhhhhhhhhhhhhhhhhhhhh so nevermind. Mesh>separate>faces. Specify by angle. I hate when I put a lot of work into describing my problem and run across the answer 20 minutes later
macfly likes this.
eishinsnsayshin 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
Fluent3DMeshToFoam simvun OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 48 May 14, 2012 05:20
Different flow patterns in CFX and Fluent avi@lpsc CFX 6 April 17, 2012 01:22
Different flow patterns in CFX and Fluent avi@lpsc FLUENT 4 April 8, 2012 06:12
CFX13 Post Periodic interface EtaEta CFX 7 December 8, 2011 17:15
asking for Boundary condition in FLUENT Destry FLUENT 0 July 27, 2010 00:55


All times are GMT -4. The time now is 04:24.