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

Baffle cell problem in shock tube

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   November 14, 2004, 13:47
Default Baffle cell problem in shock tube
  #1
AB
Guest
 
Posts: n/a
Hello,

I am trying to run a shock tube model, with a tube divided into 2 sections and each section is defined as different material( though air in both) but with different pressures and temperatures. I have given them stagnation inlet BCs and and pressure outlet BCs and slip walls and symmetry BCs on rest of the sides accordingly. I have also initialised the pressure and temp through Nav center from the initialisation option for different material.

Here all checks are completed without any errors but when I write the geometry file I get this error in the model::

Error 5 - "Adjacent cells are in different fluid streams and not seperated by a wall or baffle. "

This is where I dunno whether I need to specify baffle cells or not in the interface.

Also if I specify baffle then, it will become 2 seperate regions and there might then be no interaction between different fluid streams.

waiting for anyone's response...

I am sure many people here have done shock tube problem using star-CD and I want to get some tips and tricks .

Thanks,

AB
  Reply With Quote

Old   November 14, 2004, 14:04
Default Re: Baffle cell problem in shock tube
  #2
Brian
Guest
 
Posts: n/a
Your problem is that you have used two different materials. Materials are not allowed to mix, they must be in separate streams or be solid / fluid.

Specify the air in both sections as the same material, and problem solved. You would have to use user coding or perhaps tables to initialize.
  Reply With Quote

Old   November 14, 2004, 16:32
Default Re: Baffle cell problem in shock tube
  #3
AB
Guest
 
Posts: n/a
Hello Brian,

Still it is not working. I am getting all 0 values in my run and it says there are some warnings in .info file.

If u have time then please send me your email id so that I can send you the model file in zip format for you to just look into it as it is some simple error which I am not able to take care of.

Will be waiting for response,

Thanks,

Arnab
  Reply With Quote

Old   November 15, 2004, 02:51
Default Re: Baffle cell problem in shock tube
  #4
Brian
Guest
 
Posts: n/a
You should be sending it to your local support office for help.
  Reply With Quote

Old   November 15, 2004, 09:44
Default Re: Baffle cell problem in shock tube
  #5
Anton Lyaskin
Guest
 
Posts: n/a
Hi Arnab

You have to use different cell types and one material. To assign different initial temperature and pressure basing upon different cell types you'll have to use user subroutine INITFI

Regards, Anton
  Reply With Quote

Reply


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
Shock Tube problem mouna lamnaouer FLUENT 1 September 22, 2011 13:47
Sod Shock Tube problem cfd Main CFD Forum 4 July 7, 2009 14:24
Shock tube Problem 21kalee OpenFOAM Running, Solving & CFD 2 June 12, 2008 07:57
SOD shock tube problem Luuk Main CFD Forum 3 September 6, 2005 06:08
Shock tube problem AB Siemens 1 November 9, 2004 01:25


All times are GMT -4. The time now is 21:35.