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-   -   VOF mass loss (http://www.cfd-online.com/Forums/fluent/109394-vof-mass-loss.html)

Smaras November 16, 2012 10:39

VOF mass loss
 
Hello all,

I am doing VOF simulation with 2ddp. Now using two phase air and water. Taking water as first phase and air as second. With small inlet with 96 m/s air impingement over water surface. Lance to water bath distance is 154 mm with 100 mm depth of water bath and having 100 mm radius of cylinder. Outlet is at top defined as pressure outlet. Now the problem is that when i am doing calculation it's diverging but the results are totally disappointing as the penetration depth of the air jet should have reached 14 mm while it simulation its stuck at 7.5 and further there is a mass loss of around 0.1 Kg out of 3 Kg.
Have used coarser mesh and its showing better result. Now according to the theory the finer mesh should have given better result but here it's 180 degrees. :(

Would be thankful if some would give suggestions.

Regards,
Smaras

http://imageshack.us/a/img23/6368/kepfinal.th.jpg

http://imageshack.us/a/img23/6368/kepfinal.th.jpg

Smaras November 16, 2012 11:00

And further i am using URF as
pressure 0.2
momentum 0.3
Tur. dissipation rate 0.8
Tur. viscosity 0.8
Step size 0.0001

Non iterative with Factional Scheme
Volume Fraction = geo reconstruct
Turb. KE = quick

Regard & Thanks in advance

Smaras November 20, 2012 07:36

After even changing my Under relaxation factors. More finer mesh was simulated. But still mass loss is there.

Is there any one who can help in this regard.

Best Regards,
Smaras


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