# VOF modelling open channel river flow

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 January 14, 2003, 16:59 VOF modelling open channel river flow #1 Matthew Roberts Guest   Posts: n/a HELP! I wish to model 3D turbulent flow and water surface superelevation in open channel meandering rivers. My channel geometry consists of three 180 degree constant radius of curvature bends, rectangular in cross-section. I have split the inlet face in gambit along the air/water interface and in fluent given a vol. fraction 1.0 to phase 2(water) for the water inlet and a vol. fraction 0.0 to phase 2(water) for the air inlet. Q1: Do I need to patch the initial volume of water/air into the channel(as this is complex) or can I simply let the VOF model determine the liquid/gas interface as the fluid flows through the geometry, since I'm using an unsteady solver? Q2: When I initialise the entire flow field the options available to provide flow velocities are in the cartesian x,y,z coordinate directions, however this is not applicable when providing an initial guess for the flow around a bend! At present I am simply leaving the velocities as the default zero. Is there a way of specifying a downstream velocity parallel to the channel walls to reduce the convergence time? Q3: Finally, I have specified the air and water inlets as velocity inlets, is OUTFLOW the best BC for the outlet or should I use PRESSURE OUTLET? Also what about the BC along the upper surface ABOVE the air as I want to ensure its an "open channel", do I specify SYMMETRY of PRESSURE INLET (as detailed in the tutorial guide)? Any advice would be gratefully appreciated, Cheers Mat

 January 15, 2003, 07:02 Re: VOF modelling open channel river flow #2 heydari Guest   Posts: n/a I think it is better to patch your initial condition to have better convergency. also for b.c i think you had better to use pressure inlet with gage equal to zero for your surrounding environmetn feild of water - flow also for outlet. wish it could help you.......

 January 16, 2003, 14:38 Re: VOF modelling open channel river flow #3 varshavian Guest   Posts: n/a hi i have a problem like u have please send me if u have more info thanks

 January 20, 2003, 03:18 Re: VOF modelling open channel river flow #4 morteza Guest   Posts: n/a dear sir iwant to modelling a recuperator with fluent. i have any problem in it.

 July 15, 2009, 13:50 #5 Member   mechovator Join Date: May 2009 Posts: 32 Rep Power: 9 Hello dear christine. I just saw your problem and learned that you got its solution. I have just started my MS and am working in the same field i.e. open channel flows. It would be very nice of you if you could please help me. Feel free to contact me on mechovator@yahoo.com With best regards Mechovator

 July 31, 2009, 11:33 #6 New Member   anissa ghomrassi Join Date: Apr 2009 Posts: 5 Rep Power: 9 hello i'm also working in sedimentation in meandering rivers please contact me on ghomrassi.anissa@hotmail.com

 July 31, 2009, 12:52 #7 Member   Join Date: Mar 2009 Posts: 49 Rep Power: 9 Check the help file, as I remember, a pressure BC and an outflow BC should not be used together in one problem.

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post newcomer Fluent Multiphase 27 January 22, 2016 01:26 motaba Main CFD Forum 4 March 26, 2011 04:22 gizeh FLUENT 0 October 12, 2009 06:20 lett FLUENT 17 April 9, 2009 10:56 sachin jadhav FLUENT 0 April 9, 2008 15:53

All times are GMT -4. The time now is 21:32.

 Contact Us - CFD Online - Top