CFD Online URL
[Sponsors]
Home > Forums > Main CFD Forum

Y+ Values

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 20, 2001, 09:24
Default Y+ Values
  #1
Matthias
Guest
 
Posts: n/a
iŽam simulating flow forces on a spool in hydraulic valve with cfdesign (blue ridge numerics)

so i have problems with the validation of my results!

cfdesign is using in the k-eps-model wall functions to simulate the turbulent flow next to a wall

can somebody explain to me how the Y+ Value works and why ?

e.g.

-> what happen if the values outside the range given by cfdesign (35 < y+ < 350)

-> Y+ values to low: should i unrefine the mesh, which variables are under- or overpredicted

-> Y+ values to high: refine the mesh?

-> etc.

mfg

Matthias
  Reply With Quote

Old   November 21, 2001, 05:24
Default Re: Y+ Values
  #2
Mukhopadhyay
Guest
 
Posts: n/a
i suggest you look at schlichting's book 'boundary layer theory'. you get (a)idea about y+ ,(b)the derivation for wall region in terms of y+ and (c) assumptions for wall shear etc., used in the derivation. one shoud go preferably for remeshing (depending on the wall treatment) at the near wall region. some caution, in terms of meshing, should be exersised to address the vicinity of the near wall region, i.e., the wall law region to the fully developed one.
  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
TimeVaryingMappedFixedValue irishdave OpenFOAM Running, Solving & CFD 26 July 24, 2014 05:30
max node values exceed max element values in contour plot jason_t FLUENT 0 August 19, 2009 12:32
exact face values RubenG Main CFD Forum 0 June 22, 2009 12:09
strange node values @ solid/fluid interface - help JB FLUENT 2 November 1, 2008 14:04
node values or cell values? aPpA FLUENT 0 November 10, 2006 09:56


All times are GMT -4. The time now is 08:20.