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

submarine

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 7, 1999, 12:46
Default submarine
  #1
Jong-hyun Kim
Guest
 
Posts: n/a
I am calculating about some phenomena around submarine in CFD, but I have never found out the comparable experiment data with my calculation. If you ,CFD friends,have experiment data, can you share data? it is the secret of the military in our country.
  Reply With Quote

Old   February 7, 1999, 12:52
Default Re: submarine
  #2
yijaekyu
Guest
 
Posts: n/a
you see. submarine is a very classified research area. if you really want to know sub. data. you need to describe your submarine's shape.
  Reply With Quote

Old   February 8, 1999, 11:26
Default Re: submarine
  #3
John C. Chien
Guest
 
Posts: n/a
It is really a very "strange" question about getting experimental data, especially one is running the CFD calculation. It is like counting number of fingers while using an electronic calculator. Are you having problems with your CFD calculations? Are you using a commercial code ? or your own code ?
  Reply With Quote

Old   February 8, 1999, 20:45
Default Re: submarine
  #4
Sung-Eun Kim
Guest
 
Posts: n/a
Dear Jong-Hyun,

Depending on specifically what phenomena you're interested in, you may not need a comprehensive experimental data around fully appended, complete (real) submarines.

If you're interested in appendage-body juncture flows, I believe there are a considerable volume of experimental data in the literature (ASME JFE data bank probably). If you're interested in high-incidence angle maneuvers and want to compute the flow structure on leeside of the body for instance, you may want to look for experimental data around elongated bodies such as spheroids. Finally, if you're interested in turbulent boundary layers past underwater bodies (idealized submarine hull form), I can share one with you.

Wing-body juncture flows, turbulent boundary layers, tip vortices emanating from appendages, and flow around elongated bodies at incidence, these are the phenomena that are all important in the hydrodynamics for submarines. They are building blocks of the flow you're interested in, and studying these flows individually often give us deeper insights to the flow.

CFD calculation for complete (fully-appended) submarines is still a challenge not only because of the sheer complexity of the physics and the lack of our understanding of how to model it (e.g. turbulence) but because of the mesh resolution required to resolve the details of the flow all at the same time. I've once used almost 2 million cells, but even with such a large mesh, the flow was still under-resolved by all accounts. And it wasn't fully appended.

Please let me know what you're specifically interested in.

  Reply With Quote

Old   February 9, 1999, 17:59
Default Re: submarine
  #5
Jean-Yves
Guest
 
Posts: n/a
validation

I think if your code has been validated for some basic test-cases (shapes, angles, curves, cylinder,...the more the better), you theorically do not have to worry so much about your calculation, isn't it?

jy
  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
scour under submarine pipelines exposed to steady flow kjelban FLOW-3D 7 February 6, 2014 21:20
Submarine Free Surface samwh CFX 7 August 30, 2009 07:14
3D grid around submarine hull Mahbub FLUENT 0 July 2, 2008 07:18
Meshing a submarine Salman CFX 8 September 28, 2004 12:14
Behaviour of a Submarine at Earthquake daniel troni Main CFD Forum 1 June 19, 2001 17:04


All times are GMT -4. The time now is 04:09.