CFD Online Logo CFD Online URL
Home > Forums > FLUENT

User Defined Profiles, Swirl, Velocity Inlet

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

LinkBack Thread Tools Display Modes
Old   January 26, 2011, 16:35
Default User Defined Profiles, Swirl, Velocity Inlet
New Member
Join Date: Mar 2010
Posts: 1
Rep Power: 0
saurus is on a distinguished road
I've been trying to simulate the flow in a domain consisting of a large cubical volume with a channel in the bottom that is at some angle to the flow. The channel stretches from the inlet to the outlet. I expect the flow in the channel to eventually reach something like helicoidal flow.

Because I want to know something about the streamlines of the flow when it is fully developed, I have been running the simulation with a uniform velocity inlet, and then writing the outlet velocities and turbulence parameters to a profile file, then I have been using these as part of a user defined profile for the inlet of a subsequent run.. repeat, repeat.

I noticed that in each run, the flow would begin in the x-direction (normal to the inlet) and then begin to develop into a helicoid. I read that when using cartesian coordinates for a velocity inlet boundary condition, Fluent dots the velocity profile with the normal, which explains why my y and z velocities are kind of getting washed away, however I was wondering if there is any way around this? I've tried saving the velocities in cylindrical coordinates (v_theta should allow some "swirl", right?), however then my results are really nonsense, and the simulation doesn't converge.

Any insight to a better way to initialize swirl-like flow in a non-symmetrical volume, or any other help would be greatly appreciated.

If I wasn't clear or if you need more information, please don't hesitate to ask, first time posting here, it's hard to spell this stuff out!

Thank you.
saurus is offline   Reply With Quote


profiles, swirl, udf, user defined, velocity inlet

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
Steady pipe flow mean velocity higher than inlet velocity anita OpenFOAM Running, Solving & CFD 7 September 25, 2012 05:35
OpenFOAM static build on Cray XT5 asaijo OpenFOAM Installation 9 April 6, 2011 12:21
Pressure Inlet Velocity prapanj OpenFOAM 11 June 23, 2009 11:15
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 09:11
user subroutine of inlet boundary raymond CD-adapco 4 December 6, 2001 06:44

All times are GMT -4. The time now is 04:17.