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2 Phase flow in CFX?

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Old   May 31, 2012, 17:59
Default 2 Phase flow in CFX?
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John E
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Hello!

I have this problem I've been looking at with a large underwater tank of LNG (of some kind) that erupts, causing the liquid to boil and seep from the tank while water is pressing into the tank. The goal is to find out how fast the tank is emptied of LNG.

Can CFX handle 2-phase flows, i.e., the transition from liquid to gas at temperature changes, etc? If not, just normal liquid mixing would be an interesting scenario to try out. Anyone done something similar?
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Old   May 31, 2012, 18:55
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Glenn Horrocks
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Yes, CFX can model this. But it is quite a difficult model with lots of complex physics going on. It will take a while to set up and validate/verify.
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Old   June 2, 2012, 03:07
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Thanks! Good to hear. I will try to go ahead and see what I can make out of this, complex as it is.
If anyone have any tips or heads-up on the setup, I'd be grateful!
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Old   June 2, 2012, 06:32
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My big tip is to start simple (eg ideal gas) and get that working before going to real gas properties. Also develop the physics one model at a time - so a simple test case to get the compressible flow working, then another one just looking at the boiling of LNG, then a third model just looking at the water LNG mixing (with no boiling). Don't forget to validate and verify these simple models, either to experimental results or analytical solutions. When all these simpler models are working by themselves only then should you start combining them together into the final simulation.
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Old   June 4, 2012, 03:12
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John E
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Yes that sounds reasonable. Thanks! The more I think about it I realize how complex this problem really is.

One practical question about CFX, though. I've done a few simulations in CFX earlier, but that was always with specific inlets and outlets. How do you specify a pool, with the extent and properties of the liquid?
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Old   June 4, 2012, 03:15
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This is all in the initial conditions.
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