[Niru]

Hi, I have 3 fluids - water, air and liquid methane.
I am able to view 3 fluids if I put vol fraction of 10% for liquid methane and 50% for water and air. If I put 50% for liquid methane the fluid is not visible. Is is ok if I use 10%, if I have 3 fluids ?

[ghorrocks]

I do not understand your question.

Also, what state do these fluids exist in? water and air are probably separated by a free surface, but how does the liquid methane interact? Does it form its own free surface with air and water, or doe sit mix with water?

[Niru]

the water temperature was initially 293K. liquid methane is cryogenic liquid. As it flows over water, the water temperature reduces.
The water temperature has reduced in regions where the 10 vol% liquid methane was present. the 10% vol frac of liquid methane is representative of water temperature reduction in water. The 50% vol fraction of liquid methane, trails behind the 10% liquid methane. The water regions in places shows temperature reduction greater than the 10% vol fraction areas. How should I select the vol fraction that represent the area covered by liquid methane on water.
Here, the Liquid methane- water, liquid methane air is modeled using particle model for interphase transfer. water - air through free surface model. Overall it is homogeneous equilibrium model.