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

problems with velocity and pressure boundary conditions inb IcoFoam

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 31, 2013, 05:47
Default problems with velocity and pressure boundary conditions inb IcoFoam
  #1
Member
 
mohsen kh
Join Date: Jan 2013
Location: Iran
Posts: 86
Rep Power: 5
m5m5kh is on a distinguished road
Hi friends:
My case of study is a furnace with numbers of holes as inlets. I know local atmosphere pressure but I have problems with boundary conditions of inlet velocity and that of outlet. I have the same problems with inlet and outlet pressure conditions and those of internal field pressure and temperature. I use IcoFoam. Please help me if you can. I do not know exactly to use which temperature to define transport properties and use for my pressure converting in P conditions.
I attach the figure of my case for your consideration.
http://tinypic.com/view.php?pic=167ktuw&s=6
m5m5kh is offline   Reply With Quote

Old   April 1, 2013, 02:26
Default
  #2
Member
 
mohsen kh
Join Date: Jan 2013
Location: Iran
Posts: 86
Rep Power: 5
m5m5kh is on a distinguished road
I am sure that the problem is caused by pressure boundary conditions for internal field and outlet
I know the mass flux of outlet and area of it and I know the inlet gas pressure but I used "zeroGradient" as boundary condition for inlets.
I almost don't know what to do with my pressure boundary condition
plz help!!!
m5m5kh is offline   Reply With Quote

Old   April 1, 2013, 13:23
Default
  #3
Super Moderator
 
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 8,301
Blog Entries: 34
Rep Power: 84
wyldckat is just really nicewyldckat is just really nicewyldckat is just really nicewyldckat is just really nice
Greetings Mohsen,

icoFoam ? It's a very basic solver... so shouldn't you use pimpleFoam? Or go directly to one of the other variant solvers from pimpleFoam which do have temperature and/or compression?

In my level of experience, I'm only able to suggest that you first simplify your geometry and start with that simple geometry, until you can figure out how the boundary conditions work. In addition, the advantage of a simple geometry is that you can more easily share it with us, so that someone can do some trial-and-error to help you figure out the solution!

Best regards,
Bruno
wyldckat is offline   Reply With Quote

Old   April 3, 2013, 00:55
Default
  #4
Member
 
mohsen kh
Join Date: Jan 2013
Location: Iran
Posts: 86
Rep Power: 5
m5m5kh is on a distinguished road
Thanks Bruno
I will do so.thanks for your help but unfortunately I can't change or simplify my geometry I will use pimpleFoam.
m5m5kh 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
Wind turbine simulation Saturn CFX 34 October 16, 2014 05:27
An error has occurred in cfx5solve: volo87 CFX 5 June 14, 2013 17:44
Error finding variable "THERMX" sunilpatil CFX 8 April 26, 2013 07:00
RPM in Wind Turbine Pankaj CFX 9 November 23, 2009 05:05


All times are GMT -4. The time now is 03:56.