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

Problems with Boundary Profile

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 22, 2005, 10:12
Default Problems with Boundary Profile
  #1
hermann
Guest
 
Posts: n/a
Dear fellow Fluent users,

I am simulating the air flow and temperature in a room. Due to memory restrictions I simulated a small zone (box) around the air ducts in a seperate modell with the boundaries as pressure outlets. From this modell I wrote the x,y and z velocities, the temperature, turb. kin. energy and dissipation rate in a Profile file.

However after importing the profile into the model of the whole room there are significant variations in the velocity vectors and minor variations in the mass fluxes.

To be more specific, the velo magnitude an the edges of the box are about 1.3 m/s, the corresponding value of the boundary profile in the room model is about 0.4 m/s!! (the mesh of the small box is 4 times finer then the mesh of the room, so there will be some interpolation error).

I searched the forum for similar problems but couldn't find a solution. Any advice would be greatly appreciated..

Regards

K.D. Hermann
  Reply With Quote

Old   March 2, 2005, 13:00
Default Re: Problems with Boundary Profile
  #2
reda gad
Guest
 
Posts: n/a
i would ask you a question What is the boundary condition at the inlet of the room? i think that you have to use veloity inlet bc. and use profiles of flow direction cosines (ni , nj, and nk) in addition to your profiles to specify flow direction at inlet of room.
  Reply With Quote

Reply

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
Some Problems about the Boundary Conditions in OpenFoam lzgwhy OpenFOAM Running, Solving & CFD 47 October 10, 2017 09:33
Boundary Profile E61 FLUENT 0 January 5, 2011 09:13
Pressure Boundary Problems Chris Siemens 2 June 21, 2005 09:20
Gambit Boundary Edge Problems Ashton Peters FLUENT 0 October 5, 2004 22:59
NON-UNIFORM VELOCITY INLET BOUNDARY PROFILE MURAT Main CFD Forum 0 December 30, 2003 22:08


All times are GMT -4. The time now is 21:48.