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-   -   InterFoam mass conservation question (http://www.cfd-online.com/Forums/openfoam-solving/59449-interfoam-mass-conservation-question.html)

msrinath80 September 11, 2007 20:13

I'm trying to simulate the mot
 
I'm trying to simulate the motion of a single air bubble through a column of water.

When the simulation starts, the log file reads:

MULES: Solving for gamma
Liquid phase volume fraction = 0.0013888 Min(gamma) = 0 Max(gamma) = 1
MULES: Solving for gamma

After about 0.8 seconds (with time-step size of approximately 0.0001, Max Co = 0.15):

MULES: Solving for gamma
Liquid phase volume fraction = 0.0013888 Min(gamma) = -2.7143954e-24 Max(gamma) = 0.9551684
MULES: Solving for gamma

Why does the maximum gamma in the domain decrease to 0.95? Surely there are significant regions in the domain where only pure water is present. If I'm mistaken can someone explain what Max(gamma) represents. Thanks!

hsieh September 11, 2007 21:24

Hi, Did you plot the result
 
Hi,

Did you plot the results to check if the results are reasonable? Do you have surface tension turned on?

pei

msrinath80 September 11, 2007 21:28

Yup, results look reasonable.
 
Yup, results look reasonable. Surface tension is defined in transportProperties. How is it turned on?

hsieh September 13, 2007 11:37

Hi, Any luck? If not, you
 
Hi,

Any luck? If not, you can send me your case. I will take a look at it when I have the spare time.

pei

msrinath80 September 13, 2007 13:33

Hi Pei, I am running a slig
 
Hi Pei,

I am running a slightly different case with a very well refined mesh. Now Max(gamma) is at 0.99999993 which I believe is not a problem. However should it decrease to something like 0.9 or 0.95 I will package the case and email it to you. Thanks for your help.

Nazanin December 9, 2013 02:19

Quote:

Originally Posted by msrinath80 (Post 186096)
Hi Pei,

I am running a slightly different case with a very well refined mesh. Now Max(gamma) is at 0.99999993 which I believe is not a problem. However should it decrease to something like 0.9 or 0.95 I will package the case and email it to you. Thanks for your help.

Hi Srinath
Do you found your problem?I have a problem like you....


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