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

Specify Inlet Velocity Profile

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 17, 2010, 14:10
Question Specify Inlet Velocity Profile
  #1
New Member
 
Jacob
Join Date: Mar 2010
Posts: 2
Rep Power: 0
JHardes is on a distinguished road
Hey folks,

I am working on an assignment for my CFD class. The goal is to simulate flow over a backward facing step in a 2-D duct, and use the results to evaluate the performance of different turbulence models. We have experimental data to compare with.

The inlet to the domain is 4 step-heights upstream of the step, so the inlet velocity profile must be specified. We are using a ln model for the profile, but both the top and bottom of the duct is "no-slip" so the same equation cannot be used from top to bottom.

I want to use something like this:

LIBRARY:
CEL:
EXPRESSIONS:
!IF y <= 0.0635
InletProfile = 0.6937*((4.461[m s^-1]*ln(121930*((y/0.0127[m])-1))) + 5[m s^-1])
!ELSE IF y > 0.0635
InletProfile = 0.6937*((4.461[m s^-1]*ln(121930*(((0.11431-y)/0.0127[m]))))+5[m s^-1])
END
END
END
END

Doesn't work (obviously?). I have been reading into it. Fortran?

Can someone point me in the right direction?

Thanks,

Jacob
JHardes is offline   Reply With Quote

Old   March 17, 2010, 14:59
Post Oops.
  #2
New Member
 
Jacob
Join Date: Mar 2010
Posts: 2
Rep Power: 0
JHardes is on a distinguished road
I am working in CFX.
JHardes is offline   Reply With Quote

Reply

Tags
inlet, velocity profile

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
Poiseuille's inlet velocity profile Aleksey_R OpenFOAM 25 December 14, 2010 03:11
Fully developed 3d velocity profile: Square inlet! Taru FLUENT 5 June 23, 2008 06:04
Neumann pressure BC and velocity field Antech Main CFD Forum 0 April 25, 2006 02:15
How to create Hemisphere Velocity Profile at inlet Nelson FLUENT 0 July 10, 2005 21:44
using profile to specify inlet VOF and velocity yf FLUENT 8 June 2, 2005 05:40


All times are GMT -4. The time now is 05:50.