CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Cavitation model in new fluent version

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 4, 2000, 17:48
Default Cavitation model in new fluent version
  #1
John Lee
Guest
 
Posts: n/a
Have you tried the new cavitation-model in fluent ? Did you get good results for turbines and pumps ?

John
  Reply With Quote

Old   August 5, 2000, 14:18
Default Re: Cavitation model in new fluent version
  #2
John C. Chien
Guest
 
Posts: n/a
(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.
  Reply With Quote

Old   August 17, 2000, 13:51
Default Re: Cavitation model in new fluent version
  #3
Joern Beilke
Guest
 
Posts: n/a
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.

  Reply With Quote

Old   August 17, 2000, 21:03
Default Re: Cavitation model in new fluent version
  #4
John C. Chien
Guest
 
Posts: n/a
(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.
  Reply With Quote

Old   August 20, 2000, 20:00
Default Re: Cavitation model in new fluent version
  #5
John Lee
Guest
 
Posts: n/a
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.
  Reply With Quote

Old   August 21, 2000, 12:25
Default Re: Cavitation model in new fluent version
  #6
John C. Chien
Guest
 
Posts: n/a
(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.
  Reply With Quote

Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cavitation model in compressible flows. jinwon park Main CFD Forum 1 May 11, 2015 08:24
prePDF preprocessor in FLUENT (ANSYS 12 version) anee Fluent UDF and Scheme Programming 7 March 18, 2013 23:57
What different SST turbulent model between Fluent 12.1 and Fluent 6.3 opehterinar81 FLUENT 0 August 24, 2011 07:34
FLUENT cavitation model CFDtoy FLUENT 4 October 15, 2008 11:31
UDF in parallel version of fluent yobee FLUENT 2 August 5, 2004 01:36


All times are GMT -4. The time now is 23:29.