VOF fluxes not balancing even it's converging..urgent please!!!

eers · June 18, 2010, 17:05

HI all

I am using 3D VOF steady state implicit solution (i don't need unsteady at this point) and I run the solution and it took more than 5 days to converge (the residual limits are in the range of 10^-6). The problem here is the fluxes are not balancing. Secondary phase (water here) has not yet reached outlet and primary phase (air) is showing some reverse flow at the outlet. what does it mean without mass flow rate balancing, even though residuals reached to such low levels. I wonder it works if I use implicit unsteady solution.

Also I started wid high velocities at the inlet to fill the inside domain wid water and reduced eventually to actual velocity. I allowed more time to dispose the already filled water towards the exit (pressure outlet) but it seems it's still showing lot of liquid at the entry though the convergence has already reached.

Any suggestions please!!! appreciate for your valuable suggestions

thanks
Regards
eers

eers · June 21, 2010, 11:14

No one here to answer!!!!!

idrama · July 10, 2010, 05:50

What did you do to measure this!

eers · July 11, 2010, 01:36

Report-> fluxes->inlet & outlet( for individual phases)..

idrama · July 11, 2010, 05:39

Okay! I think you do not use OpenFoam, do you?

eers · July 13, 2010, 15:56

i am using FLUENT 6.3.2

June 18, 2010, 17:05	VOF fluxes not balancing even it's converging..urgent please!!!	#1
eers New Member eers Join Date: Jun 2009 Posts: 27 Rep Power: 17	HI all I am using 3D VOF steady state implicit solution (i don't need unsteady at this point) and I run the solution and it took more than 5 days to converge (the residual limits are in the range of 10^-6). The problem here is the fluxes are not balancing. Secondary phase (water here) has not yet reached outlet and primary phase (air) is showing some reverse flow at the outlet. what does it mean without mass flow rate balancing, even though residuals reached to such low levels. I wonder it works if I use implicit unsteady solution. Also I started wid high velocities at the inlet to fill the inside domain wid water and reduced eventually to actual velocity. I allowed more time to dispose the already filled water towards the exit (pressure outlet) but it seems it's still showing lot of liquid at the entry though the convergence has already reached. Any suggestions please!!! appreciate for your valuable suggestions thanks Regards eers

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June 21, 2010, 11:14		#2
eers New Member eers Join Date: Jun 2009 Posts: 27 Rep Power: 17	No one here to answer!!!!!

July 10, 2010, 05:50		#3
idrama Senior Member Claus Meister Join Date: Aug 2009 Location: Wiesbaden, Germany Posts: 241 Rep Power: 18	What did you do to measure this!

July 11, 2010, 01:36		#4
eers New Member eers Join Date: Jun 2009 Posts: 27 Rep Power: 17	Report-> fluxes->inlet & outlet( for individual phases)..

July 11, 2010, 05:39		#5
idrama Senior Member Claus Meister Join Date: Aug 2009 Location: Wiesbaden, Germany Posts: 241 Rep Power: 18	Okay! I think you do not use OpenFoam, do you?

July 13, 2010, 15:56		#6
eers New Member eers Join Date: Jun 2009 Posts: 27 Rep Power: 17	i am using FLUENT 6.3.2