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

Low Re Mesh

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

LinkBack Thread Tools Display Modes
Old   April 18, 2012, 04:15
Arrow Low Re Mesh
New Member
Join Date: Feb 2011
Posts: 8
Rep Power: 8
naveen_010 is on a distinguished road
Sponsored Links
Dear CFD users

In low Re number modelling how does the solver knows, to solve governing equations in all the cells including near wall cells and not to use wall function. I am defining Low Re number k-e turb model with inlet and pressure boundary condition along with standard wall function.

For your information the near wall cells follows the Y+ = 1 and I am having around 12 layers of mesh near the wall.

Thanks in advance.
naveen_010 is offline   Reply With Quote
Sponsored Links

Old   April 18, 2012, 04:38
Join Date: Nov 2009
Posts: 36
Rep Power: 9
aerospaceman is on a distinguished road

As I understand it, you have to select (or not) a solver setting that will employ wall functions.

You are then forcing the code to resolve the boundary layer as opposed of modelling. That is "how it knows.."

Look up your Theory/Users Guide for the package you are using.

Generally however, I'd refine the grid more in order to ensure that everywhere in your domain your Y+ is less than one.

Now don't confuse "Wall Function" with "Wall Damping Functions".

Hope this helps.
aerospaceman is offline   Reply With Quote

Old   April 18, 2012, 09:40
New Member
Join Date: Feb 2011
Posts: 8
Rep Power: 8
naveen_010 is on a distinguished road
Dear Aerospaceman

I am using star-cd and in the panel I can choose either stanard wall function,Non-equillbrium or Angelberger for wall function and there is no option to deselect or make it off. with this if i am using a mesh with y+<=1 and how does the solver knows not use any of the wall function method.

Thanks in advance
naveen_010 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
[ICEM] Hexa Mesh Smoothing Jules ANSYS Meshing & Geometry 6 December 4, 2010 19:00
Mesh adaption in a wake at low Re. Pascal CFX 17 February 10, 2009 20:01
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 12:55
basic of mesh refinement arya CFX 4 June 19, 2007 12:21
Mesh Mignard FLUENT 2 March 22, 2000 06:12

Sponsored Links

All times are GMT -4. The time now is 23:08.