CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Post-Processing

Probes between wall and 1st cell

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 16, 2017, 00:40
Default Probes between wall and 1st cell
  #1
Member
 
Join Date: Apr 2017
Posts: 37
Rep Power: 2
kaaja is on a distinguished road
Hi.
I have implemented a k-epsilon model for a channel flow using simpleFoam.
yPlus is around 30 and I apply wall-functions.
When plotting results, I extract the simulated values using probes.
Between the wall and the first cell, all the probes show the same velocity-value.
Does anybody know how one can get non-constant probe-values in the region between the wall and the first cell?
kaaja is offline   Reply With Quote

Old   April 16, 2017, 00:56
Default
  #2
Senior Member
 
piu58's Avatar
 
Uwe Pilz
Join Date: Feb 2017
Location: Leipzig, Germany
Posts: 389
Rep Power: 5
piu58 is on a distinguished road
You cannot get real values from this firts layer. It is possible to extrapolate values using the first cells. sample gives different methods for calculation of cell internal value, some of them should fit. If not, then extract the cell values for the first two cells and interpolate / extrapolate for yourself.
__________________
Uwe Pilz
--
Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950)
piu58 is offline   Reply With Quote

Old   April 16, 2017, 01:13
Default
  #3
Member
 
Join Date: Apr 2017
Posts: 37
Rep Power: 2
kaaja is on a distinguished road
Thanks for replying!
I will try the sample-utility.

I thought the wall-functions would fill in values between the wall and the first cell located at around yPlus=30?
kaaja is offline   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
Probes between wall and 1st cell kaaja Main CFD Forum 0 April 15, 2017 12:38
wall function and 1st grid bye bye my blue OpenFOAM Running, Solving & CFD 1 February 18, 2017 13:02
Distance of 1st Cell from the wall miz_miz CFX 17 February 26, 2015 18:07
Possible Bug in pimpleFoam (or createPatch) (or fluent3DMeshToFoam) cfdonline2mohsen OpenFOAM 3 October 21, 2013 09:28
Multicomponent fluid Andrea CFX 2 October 11, 2004 05:12


All times are GMT -4. The time now is 09:29.