CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Cavitation (divergence)

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   October 21, 2003, 04:13
Default Cavitation (divergence)
Posts: n/a
Hi; By the way I have to work with Fluent6.0.12 . Because your suggestion I increase velocity from 0 to 13m/s (2,4,6,8,10,10.5,11,11.5,12,12.5,13 m/s). But when cavitation occure, even with void fraction of .0001, the solution go to instability. I think this is caused by VOF equation at first. I have no way, only the relaxation number of .001 for vaporization mass and minimum of .1 for the others, remove this problem! I ran a case with this setting and got approximatly good results. But the time of cavity bubble development and dettachment is very high i.e. a low shedding frequency. Note that I do not use turbulence modification. I think my case has some problem: - low grid numbers near first cavity bubbles(I use 30000 mesh cell) - I have to modify the cavitation rate source term in the VOF eqwuation to model of "THREE-DIMENSIONAL UNSTEADY CAVITATION EFFECTS ON A SINGLE HYDROFOIL AND IN A RADIAL PUMP MEASUREMENTS AND NUMERICAL SIMULATIONS" By: "M. Frobenius, R. Schilling R. Bachert, B. Stoffel, G. Ludwig" I am trying to provide the new version of software. Thanks.
  Reply With Quote


Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Divergence problem for species transport model MY FLUENT 3 January 11, 2014 05:46
Quarter Burner mesh with periosic condition SamCanuck FLUENT 2 August 31, 2011 11:34
Divergence in modeling cavitation around hydrofoil Mahdi FLUENT 1 December 3, 2007 06:14
Cavitation Simulation by CFD Liu, L. CFX 2 November 29, 2000 14:50
Cavitation Simulation by CFD Liu, L. CD-adapco 2 November 1, 2000 22:51

All times are GMT -4. The time now is 12:29.