CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Tracking Flow Issuing From Outlet

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

LinkBack Thread Tools Display Modes
Old   July 6, 2001, 11:26
Default Tracking Flow Issuing From Outlet
Rupp Carriveau
Posts: n/a
I have a simple gravity driven funnel flow. This is not unlike filling a funnel at your kitchen sink and just letting it drain out. I would like to know how I would go about getting the details of the flow issuing from the outlet of the funnel. Mostly I am interested in the flow profile, i.e., is it possible to quantify the vena contracta exiting that boundary? Or, do I have to mesh the region where I suspect the vena contracta will occur? If this is so, how would one set-up the BC's? I mean, I have a free surface at the top, no problem, but then how do you bound the free surface exit when there is yet mesh downstream of that point?

I hope my question is somewhat clear.

Thanks to all who have helped me thus far!

  Reply With Quote

Old   July 7, 2001, 05:28
Default Re: Tracking Flow Issuing From Outlet
John C. Chien
Posts: n/a
(1). The problem itself is very simple. (2). you will have transient flow with free surface at the top at the atmospheric pressure, and the liquid jet will also subject to the same pressure and the gravitational field. (3). Whether the code can handle it or not, you should try to get the answer from the code vendor. If they have a sample case for this, then I guess it can be done. (4). Otherwise, you will have to write the code to solve it. And because of the gravitational field, the liquid jet will move faster in the downward direction, by continuity, the diameter of the jet will get smaller. Then the surface wave instability will set in, the jet will break up into spray.
  Reply With Quote


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
Mass flow rate at the outlet tejasvikrishna FLUENT 2 May 25, 2013 02:42
Net mass flow inlet vs outlet Nigui28 FLUENT 1 August 12, 2011 10:09
pressure outlet (open channel flow) Willem Brantegem Main CFD Forum 0 April 3, 2007 09:39
Outlet BC for subsonic flow in pipe andrea panizza FLUENT 6 May 10, 2003 07:44
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 09:11

All times are GMT -4. The time now is 20:48.