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Old   June 21, 2012, 12:41
Default bubble collapse simulation
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navid
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Hi all,

I am modeling the water vapor bubble collapse phenomenon inside water close to a wall. The initial pressure inside bubble is 3000 Pa and the ambient pressure is 1 atm. I assume both phases as compressible and use VOF model. I can see the bubble contraction but after some time, I see very small pressures (around 1 Pa) below the bubble close to solid wall. then After some time I get the "floating point exception" and "AMG solver divergence" errors.
I have attached a picture of pressure contours between the bubble boundary and close to wall. The blue parts correspond to small pressures of 1 Pa.

Any idea what should I do? Is it reasonable to have such small pressures below the bubble? I use "simple" method and PRESTO! and first order upwind for others.
Please help I am really in trouble!!
Attached Images
File Type: jpg pressure contour close to wall.jpg (61.8 KB, 40 views)
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Old   July 6, 2012, 12:36
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navid
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any idea? I am still stock in this problem
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Old   July 31, 2012, 12:59
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navid
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i have serious problem in getting convergence. the pressure amounts near the bubble and water interface reach low amounts of 1Pa after some iterations. what can I do? Is Fluent capable of simulating bubble collapse?
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