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

turbulence wall law on unstructred mesh

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 13, 2002, 03:01
Default turbulence wall law on unstructred mesh
  #1
Quain Tchew
Guest
 
Posts: n/a
I'm developing a code computing 3D compressible turbulence flow on unstructured mesh.

I don't want to make many hexahedrons near the wall, for this method requires enormous computing. I want to implement wall law on tetrahedron mesh.

I know I must calculate y+ and u+ of the near wall Control Volume(CV), and then according the y+, use different function calculate turbulence viscidity.

But which CV should I calculate? Some CV have a face on the wall, some have a edge on the wall, and some have a vertex on the wall.

How to calculate the turbulence stress resulted from the wall, k and e in the near wall CV? Should I integrate in a tetrahedron?
  Reply With Quote

Old   March 14, 2002, 06:29
Default Re: turbulence wall law on unstructred mesh
  #2
Bart Prast
Guest
 
Posts: n/a
That's why most codes use prisms at the wall.
  Reply With Quote

Old   March 18, 2002, 21:03
Default Re: turbulence wall law on unstructred mesh
  #3
Quain Tchew
Guest
 
Posts: n/a
I see.

But how can I generate prisms at the wall? can Gambit or gridgen do it?

If I have to progame to implement it, where can I find some article about it?

Thanks
  Reply With Quote

Old   March 19, 2002, 17:14
Default Re: turbulence wall law on unstructred mesh
  #4
Astrid
Guest
 
Posts: n/a
Gambit can do it, definitely.

Astrid
  Reply With Quote

Old   March 20, 2002, 10:50
Default Re: prism grid generation
  #5
Pete
Guest
 
Posts: n/a
Gridgen can generate layers of prism cells as well.
  Reply With Quote

Reply


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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Gambit problems Althea FLUENT 22 January 4, 2017 04:19
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 07:20
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
Convergence moving mesh lr103476 OpenFOAM Running, Solving & CFD 30 November 19, 2007 15:09


All times are GMT -4. The time now is 04:17.