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

Flow past a ship model

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 29, 2008, 16:53
Default Flow past a ship model
  #1
Ankur Srivastava
Guest
 
Posts: n/a
I have to model flow past a 3D ship model kept in a wind tunnel. I have modeled the wind tunnel as a big rectangular block with the ship model at its center-line. Now when I do the volume mesh, I can only see the meshing on the surface of the ship and the surface of the block. The fluid in between the ship and the wind tunnel does not get meshed by just clicking the volume mesh button.

I need to finely mesh the fluid downstream of the ship to capture vortex formation. How should I do this? I created the model in STAR design and used STAR CCM to do the rest.

I would appreciate any help.

Thanks

  Reply With Quote

Old   October 30, 2008, 13:24
Default Re: Flow past a ship model
  #2
tom
Guest
 
Posts: n/a
Just a guess. Maybe it is all meshed but your are not applying the volume mesh representation in your scene. Run a diagnostics to see if it is meshed
  Reply With Quote

Old   October 30, 2008, 13:48
Default Re: Flow past a ship model
  #3
Ankur Srivastava
Guest
 
Posts: n/a
Tom,

Thanks for replying. When I view the mesh I do it by opening a new mesh scene. Additionally, during post processing when I open a velocity vector field and select all parts I see the vectors only at the ship model surface and at the inlet and outlet faces. I do not see vectors in the region between the ship and the wind tunnel faces. I think I am doing something fundamentally wrong because the software does not recognize there is a volume between the ship and wind tunnel model.

Anyways, I have another question. For simple 2D meshing, consider an example where you have a smaller square at the center of a bigger square. Using STAR CCM or STAR design how would you mesh the region between the two squares. Also how would you mesh an edge using STAR CCM or STAR design.

Ankur
  Reply With Quote

Old   October 30, 2008, 14:43
Default Re: Flow past a ship model
  #4
tom
Guest
 
Posts: n/a
"Additionally, during post processing when I open a velocity vector field and select all parts I see the vectors only at the ship model surface and at the inlet and outlet faces."

so you got a converged solution; then u must have have a volume mesh, no? did u create a plane section to view the extents of the solution field?

As regards meshing between star design and CCM just import the surface mesh created in Design into CCM. I think ure model was a simple case of subtracting the ship geometry from the fluid volume volume, putting on a surface mesh and exporting from design. a 3d mesh needs to be done in design and converted to 3d in ccm by projecting the the appropriate cells to a plane.

Hope this helps
  Reply With Quote

Old   October 30, 2008, 15:24
Default Re: Flow past a ship model
  #5
Ankur Srivastava
Guest
 
Posts: n/a
How do you project a mesh on to a plane?
  Reply With Quote

Old   October 31, 2008, 19:30
Default Re: Flow past a ship model
  #6
anon
Guest
 
Posts: n/a
Sound like your trying to visualize the fluid. Instead of selecting the parts of the ship or the domain in your scalar scene, create a plane through the domain and select it as the part (instead of the ship/domain surfaces). To create a plane, Derived Parts>Section>Plane.
  Reply With Quote

Old   November 4, 2008, 05:02
Default Re: Flow past a ship model
  #7
name
Guest
 
Posts: n/a
Create threshold as plane, then you will see all vectors pass from fluid cells between hull and walls..

good luck..
  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
turbulence model for ship hydrodynamics ettax CD-adapco 0 January 20, 2009 06:02
Modelling Flow past a ship Nikhil FLUENT 0 February 29, 2008 04:55
viscous free surface flow past a ship hull lololo Main CFD Forum 0 June 13, 2002 00:02
inviscid model for ship Liang FLUENT 1 January 15, 2002 12:00
Simulating flow past a ship using CFX Dr. Tanmay Sarkar CFX 0 February 4, 2000 07:38


All times are GMT -4. The time now is 23:34.