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Cavitation model in new fluent version

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Old   August 4, 2000, 16:48
Default Cavitation model in new fluent version
  #1
John Lee
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Have you tried the new cavitation-model in fluent ? Did you get good results for turbines and pumps ?

John
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Old   August 5, 2000, 13:18
Default Re: Cavitation model in new fluent version
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John C. Chien
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(1). What is a cavitation model? (2). Why do I need one? (3). Could you define a "good result" first? (4). I have been saying that 99% of the time I am getting the wrong answers by using cfd codes. So, naturally, it is very hard to get a good result. (5). But if you can explain to us the theory and the code used behind this cavitation model, then I guess, many of us can make some comments on it.
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Old   August 17, 2000, 12:51
Default Re: Cavitation model in new fluent version
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Joern Beilke
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A very stupid and arrogant answer. It would be much nicer if you only try to answer those question where you are able to contribute some usefull information.

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Old   August 17, 2000, 20:03
Default Re: Cavitation model in new fluent version
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John C. Chien
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(1). Yes, I agree with you. (2). It would be much nicer if one only ask questions which he has answers to it. And the vendors produce only codes which do not create stupid questions or questions with no apparent answers.
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Old   August 20, 2000, 19:00
Default Re: Cavitation model in new fluent version
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John Lee
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Dear John, (1) a cavitation model is a model, that models cavitation ! (2) If someone does not know what this is - no matter. It is not essential for 99% of fluid-mechanics. If you are interested in that topic look at a search-engine or at every book about pumps or turbines. (3) reasonable values for the behaviour of pressure and velocities, not correct ones (!) If 99% of your results are completely wrong, I'd stop calculating. A question: What is wrong ? (5) For the theory look at the literature. The implementation and simplification in the code seemed to be ok, but that seemed to be in all cfd-codes. And noone brought any reasonable results.
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Old   August 21, 2000, 11:25
Default Re: Cavitation model in new fluent version
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John C. Chien
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(1). I think, what you are saying is " a black box is a box with nothing in it". (2). A new model in a black box is still nothing in the black box. (3). If we have to ask someone that is this black box working? Then I guess he has no confidence in it at all. Using my definition, it is 99% wrong.
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