CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

Simulation of transient cavitating flow around a hydrofoil

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

LinkBack Thread Tools Display Modes
Old   January 28, 2013, 16:04
Default Simulation of transient cavitating flow around a hydrofoil
New Member
Join Date: Jun 2012
Posts: 12
Rep Power: 5
kimotbwb is on a distinguished road
Hello there,

i have already performed a transient simulation of the cavitating flow around a stationary hydrofoil (e.g. CFX Tutorial Chapt. 21 "Cavitation Around a Hydrofoil") using kOmega SST turbulence modeling and the "standard" Rayleigh-Plesset Cavitationmodel which is already implemented in CFX.

Now, i have some futher questions regarding this matter. The most important question is about managing the result-data in CFX Post:

1. Does anybody know if CFX uses the Kubota model for calculating the masstransfer rate between liquid and vapor phases during cavitaion ??

Few cavitation models are available. For example: Merkle, Singhal and a few more. Comparing the CFX masstransfer equations for cavitation modeling to literature references, it seems that CFX uses the Kubota model.
Does anybody agree??

2. Does anybody has any experiences regarding the implementation of user defined cavitation models ?

3. i want to obtain the drag and lift coefficients as a function of time (transient run) in a chart (Post):

thereby, i used the following user defined expressions for c_lift and c_drag:
13[m s^-1]^2*area()@Profil)

and ...force_x()... for the drag coefficient.

Does anybody agree with this procedure?

4. does the force_() function in Post consider both the pressure and the friction forces?
And does the function already considers forces due to both phases ocuring during the cavitiaon process?

The results show cleary the frequent shedding of cloud cavitation vortices. I want to visualize both the drag and the lift coefficient on the hydrofoil as a function of time. The aim is to obtain the frequency of cloud cavitation vortices. Therefore i want to use the FFT analyse function in CFX Post. Calculating the shedding frequency with FFT is only possible if c_lift behaves like a periodic oszillation?

I would be very helpful for further help in this matter!!
Looking foreward,

kind regards
kimotbwb is offline   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
Differences and functions of Solidworks Simulation and Solidworks Flow Simulation? alpharays Main CFD Forum 0 April 19, 2012 03:13
transient, impregnating flow problem fgommer FLUENT 0 February 29, 2012 17:10
Synthetic (pulsatile) jet transient simulation aero CFX 0 November 6, 2009 02:10
Transient Simulation for pipe flow Sam CFX 0 January 7, 2005 01:06
fluid flow fundas ram Main CFD Forum 5 June 17, 2000 21:31

All times are GMT -4. The time now is 08:31.