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

Hydrofoil Transition

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 17, 2001, 06:48
Default Hydrofoil Transition
  #1
Andrew Parker
Guest
 
Posts: n/a
Dear all,

My name is Andrew Parker, and I am a student on summer placement at Rolls-Royce Marine in-between 3rd and 4th year at University. I have been using a program called Xfoil to try and design a new fin stabiliser. I have then been using my results from this program in Fluent. I have been searching the web to try and learn more about how to try and model these stabilisers in 2D in Fluent. I am trying to get advise on the best way to simulate 2D flow over a fin stabiliser (hydrofoil). I have loads of questions, but by now you are probably going to delete the e-mail, so I will confine my questions to what I consider the most important; so here goes.

1. Is it best to model the flow over a hydrofoil in steady or unsteady state? 2. Is there an ideal turbulence model for this type of problem (I have been using k-epsilon, and Spalart-Allmaras)? 3. If you model it in unsteady situations can you still extract a lift coefficient, or does it become a lift coefficient for that moment in time? 4. I have been splitting my grid into two, the first half as laminar, and the second half split at the point of transition on the upper face (where I then apply the turbulence model), does this violate any rules (I get the transition point from Xfoil)? 5. Do you know of any other programs that predict the point of laminar to turbulent transition? 6. I get different answers for steady and unsteady lift, is this normal or am I doing something wrong? 7. Lastly, could you recommend any types of generic set up values that would help me to model the flow around the foil with more accuracy, i.e. types of Discretization, area of the domain-how far the wall of the domain should be from the foil to limit the effect on the program, and loads of other stuff.

Thanks again

Andy

Andrew Parker

Student Engineer Rolls-Royce Marine
  Reply With Quote

Reply

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
Transition Models Help paulnardone STAR-CCM+ 2 September 22, 2011 19:16
Missing Information in SST Transition Model Formulation Josh CFX 2 September 14, 2010 11:49
Code release: Flow Transition and Turbulence Chaoqun Liu Main CFD Forum 0 September 26, 2008 17:15
to LANGTRY ROBIN :help, hypersonic transition SST ben akih CFX 0 September 21, 2006 04:59
modelling transition with v2f turbulence model pablo FLUENT 0 August 7, 2006 15:44


All times are GMT -4. The time now is 12:15.