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

Inlet turbulent boundary condition: external flows

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

Like Tree1Likes
  • 1 Post By Alagesanj

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 6, 2009, 12:03
Default Inlet turbulent boundary condition: external flows
  #1
ROOZBEH
Guest
 
Posts: n/a
Dear FLUENT user;

I want to simulate an external turbulent flow. To set the turbulence boundary conditions, there are some formulations in the software documentations, but unfortunately they are just for internal flows (duct flow).

How can I calculate the in-flow K and Epsilon for an external flow, for example the flow around a flat plate.

best regards, Roozbeh
  Reply With Quote

Old   February 7, 2009, 21:49
Default Re: Inlet turbulent boundary condition: external f
  #2
Alagesanj
Guest
 
Posts: n/a
Hi Roozbeh,

"For external flows the value of turbulent intensity at the freestream can be as low as 0.05% depending on the flow characteristics. You may have a good estimate of the turbulence intensity at the freestream boundary from experimentally measured data". The quote is taken from this link. http://support.esi-cfd.com/esi-users/turb_parameters/ You can follow this link and read through it. This document is for CFD ACE+ but generally applicable to all codes.

Cheers,

tareqkh likes this.
  Reply With Quote

Old   February 8, 2009, 08:02
Default Re: Inlet turbulent boundary condition: external f
  #3
ROOZBEH
Guest
 
Posts: n/a
Hi;

Thank you so much. That was very interesting and useful.

Roozbeh
  Reply With Quote

Old   August 28, 2015, 16:34
Default Turbulent intensity and viscosity ratio for flow over turbine
  #4
TKP
New Member
 
TKP
Join Date: Apr 2015
Posts: 7
Rep Power: 10
TKP is on a distinguished road
I am unable to find way to give Turbulent intensity and viscosity ratio for flow over turbine (external flow). Kindly help
TKP is offline   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
External,incompressible flow boundary condition? John FLUENT 2 August 19, 2011 01:42
Inlet turbulent boundary condition, external flows ROOZBEH Main CFD Forum 1 February 6, 2009 13:37
Boundary conditions for external flows ryan_m OpenFOAM Running, Solving & CFD 3 May 19, 2008 10:49
External Aero-boundary condition. Guest FLUENT 0 April 14, 2006 20:31
External,incompressible flow boundary condition? John Main CFD Forum 0 October 1, 2003 01:00


All times are GMT -4. The time now is 14:14.