|January 17, 2003, 15:28||
VOF PLEASE 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
|Thread||Thread Starter||Forum||Replies||Last Post|
|vof + hydrostatic pressure||ariorus||FLUENT||0||August 7, 2009 10:57|
|urgent query regarding vof model plz rply||Garima Chaudhary||FLUENT||0||July 13, 2007 02:20|
|ATTENTION!! Validty of Fluent's VOF??||ozgur||Main CFD Forum||3||February 18, 2004 19:19|
|ATTENTION!! Validty of Fluent's VOF??||ozgur||FLUENT||1||February 18, 2004 12:59|
|Difficult BCs about Freesurface Simulation by VOF||Yongguang Cheng||FLUENT||0||September 19, 2003 07:39|