CFD Online URL
[Sponsors]
Home > Forums > FLUENT

Questions on Boundary Profile,Help!!!

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 26, 2003, 18:12
Default Questions on Boundary Profile,Help!!!
  #1
Cindy Jones
Guest
 
Posts: n/a
Hi,

I am not sure how Fluent profile works.

The simple case I am trying right now is to combine two pipes together using boundry profile files. First, I created one profile file from the outlet surface of the first pipe. And then when I started running the second pipe, I used the profile as the boundary condition for the inlet surface. These two pipes have the same diameters,same orientation but different meshes. The second pipe inlet type is velocity-inlet. My questions are:

1. The mass flow rate for these two pipes are noticeably different. Why does this happen? and How can I work around it?

2. Even I used components to transfer the information from profile to the second pipe's inlet, every cell on the inlet surface has the same u,v,w velocity. If this is always the case, what is the point to use profile file? or did I miss something when I tried to use profile?

I have been struggling with this for a while, thanks for your help!

Cindy
  Reply With Quote

Old   June 26, 2003, 22:27
Default Re: Questions on Boundary Profile,Help!!!
  #2
Alex Munoz
Guest
 
Posts: n/a
Hi Cindy

Yes, you are doing something WRONG! It could not figure out waht exactly are you doing WRONG, however I wil try to help you!

First when you write and Outlet profile make sure that you write not only U, V and W velocities, but also turbulent kinetic energy (TKE) and turbulent energy dissipation rate (TED)

Then, read your profile under file read profiles. write the name of the profile

Then, impose your boundary conditions at the inlet of the second pipe, you will see a box where you can select each of the profiles (x-velocity, y-velocity, z-velocity, TKE and TED)

Then, under Solver>initialize click initialize

Then, run two or three iterations

Finally, plot the velocities on the inlet.

I am sure that you will get the profiles correctly, a little difference could be appreciate because Fluent made an interpolation of the read profiles

Best regards

Alex Munoz

  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
inlet velocity boundary condition murali CFX 5 August 3, 2012 09:56
Few simple questions concerning boundary conditions (pressure) milos OpenFOAM Pre-Processing 1 March 21, 2009 09:08
questions in initial conditions and inlet boundary nick CFX 2 April 19, 2008 10:26
Trimmed cell and embedded refinement mesh conversion issues michele OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 2 July 15, 2005 05:15
Boundary conditions? Tom Main CFD Forum 0 November 5, 2002 02:54


All times are GMT -4. The time now is 07:40.