# Problem to 'CAV' and 'VOF' in cavitation

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 December 20, 2006, 11:58 Problem to 'CAV' and 'VOF' in cavitation #1 Leon Guest   Posts: n/a Sponsored Links who can tell me the concrete definition about 'CAV' and 'VOF'. The description in tutorial is so complicated and hard to pronounce!(-: Thanks!

 December 20, 2006, 17:13 Re: Problem to 'CAV' and 'VOF' in cavitation #2 Sony Guest   Posts: n/a We found him! the last guy who is doing caviation in star-cd instead of star-ccm+!! star-cd only uses a simplified Rayleigh model. Star-ccm+ has the full Rayleigh-Plesset. You should change. Some interesting links: www.ike.uni-stuttgart.de/~www_tfd/pubs/nuclear_2000.pdf green.caltech.edu/colonius/pdfs/PrestonColoniusBrennen2001.pdf Sony

 December 20, 2006, 17:30 Re: Problem to 'CAV' and 'VOF' in cavitation #3 William Blake Guest   Posts: n/a Nonsense. Depending on your fluid you might have to use starv320 instead of ccm+.

 December 21, 2006, 06:38 Re: Problem to 'CAV' and 'VOF' in cavitation #4 Leon Guest   Posts: n/a Is that serious? I just beginn with some simple cavitation. Must I change to ccm+ now?Is the error between simplified Rayleigh model and the full Rayleigh-Plesset model severe to the same grid?

 December 21, 2006, 16:13 Re: Problem to 'CAV' and 'VOF' in cavitation #5 Charles Guest   Posts: n/a this is true, for water, oil, fuel, hydrocarbons, ... you need star-ccm+, for chewing gum and yogurt you must use star v3.2 or star v4 with stress analysis

 December 21, 2006, 17:49 Re: Problem to 'CAV' and 'VOF' in cavitation #6 William Blake Guest   Posts: n/a Try to calculate the cavitation of fuel using ccm+ and you find that the results are not good because the bubbles collapse too fast. This comes from the fact that there is not pure cavitation but cavitation with degassing. You get quite good results with v320 and the ... model. Later versions of v3 have some problems with the cavitation.

 December 21, 2006, 19:17 Re: Problem to 'CAV' and 'VOF' in cavitation #7 Leon Guest   Posts: n/a Ok, I will try to change. But,still problem, noboday has calculated cavitaion successfully with Star CD?

 December 22, 2006, 10:57 Re: Problem to 'CAV' and 'VOF' in cavitation #8 William Blake Guest   Posts: n/a A lot of people have succesfully calculated cavitation with star. You should tell some more details about your problems if you expect some help.

 December 28, 2006, 22:56 Re: Problem to 'CAV' and 'VOF' in cavitation #10 wayland Guest   Posts: n/a to William Blake and Sony how do you think about the VOF technique for cavitation simutating in STAR? maybe there are no big difference between cavitation models at present ,generally, most of which are not very robust to get relatively accurate results.that is to say, we can ignore the model difference and focus on the numerical methods, and is this right?

 December 29, 2006, 16:18 Re: Problem to 'CAV' and 'VOF' in cavitation #11 Donald Guest   Posts: n/a This is correct. The best choice here is select the code which is the most likely to be most used, i.e. starccm+ here, and of course does not have those bloody extended data.

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