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

Boundary details, free slip or no slip?

Register Blogs Community New Posts Updated Threads Search

Like Tree2Likes
  • 1 Post By Gen
  • 1 Post By Glenn Horrocks

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 3, 2008, 08:00
Default Boundary details, free slip or no slip?
  #1
Tiago
Guest
 
Posts: n/a
Hi!

In CFX-PRE -- boundary domain- default/Boundary details/ wall influence on flow, there are two options :

-No Slip -Free Slip

My simulation type is in regime transient.

And i am trying to simulate a tank with water inside.

I must put No slip or free slip? What is the difference between these parameters?

Thanks one more time!

Tiago.
  Reply With Quote

Old   March 3, 2008, 08:58
Default Re: Boundary details, free slip or no slip?
  #2
Gen
Guest
 
Posts: n/a
No slip I.e. Fluid Velocity=0 on the walls Free slip = no friction between fluid and wall
rajann_786 likes this.
  Reply With Quote

Old   March 3, 2008, 09:36
Default Re: Boundary details, free slip or no slip?
  #3
Subha
Guest
 
Posts: n/a
Hai Tiago,

Whether the water in the tank static or Dynamic? Are you doing a open cavity problem?

Regards,

Subha.
  Reply With Quote

Old   March 3, 2008, 12:22
Default Re: Boundary details, free slip or no slip?
  #4
Tiago
Guest
 
Posts: n/a
Hi! the water in the tank is dynamic.

And the tank is open in top!

Itīs better use no slip?or free slip?

  Reply With Quote

Old   March 3, 2008, 17:34
Default Re: Boundary details, free slip or no slip?
  #5
Glenn Horrocks
Guest
 
Posts: n/a
Hi,

Almost certainly you want the water phase to be no slip, but for some simulations you may wish the air phase to be free slip so you don't get wall function problems if the air drag is insignificant in the simulation. I think the CFX tutorials talk about this issue.

Glenn Horrocks
BSquared likes this.
  Reply With Quote

Old   August 20, 2013, 23:54
Default free slip boundary condition for gas
  #6
New Member
 
mohamad
Join Date: Jun 2012
Posts: 12
Rep Power: 14
mohamad3564 is on a distinguished road
Hello

I study gas- liquid bubble column. and I use free slip boundary condition for gas base on previous study. I want to understand why I have to use this
boundary condition for gas.
Thank you.
mohamad3564 is offline   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
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
strange things happen with slip boundary lei wang FLUENT 0 May 16, 2007 23:47
Low-Pressure Boundary Slip AlexA FLUENT 1 January 5, 2007 22:30
user subroutine error CFDUSER CFX 2 December 9, 2006 07:31
user defined function cfduser CFX 0 April 29, 2006 11:58


All times are GMT -4. The time now is 01:20.