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

viscous layer moves

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 16, 2008, 04:26
Default viscous layer moves
  #1
Igor-a
Guest
 
Posts: n/a
Hi,

In my simulation I have found Mach number 0.2 at the stationary wall. Turbulence model is K-epsilon, y+=10 on the wall. What i have made wrong?

  Reply With Quote

Old   September 16, 2008, 06:34
Default Re: viscous layer moves
  #2
Igor-a
Guest
 
Posts: n/a
I was meaning: speed of air flow at the stationary wall is bigger than zero... it is nonsense, but i dont understand how to get correct result
  Reply With Quote

Old   September 16, 2008, 10:08
Default Re: viscous layer moves
  #3
John S.
Guest
 
Posts: n/a
Are you calculating a convervative or hybrid value?
  Reply With Quote

Old   September 16, 2008, 13:41
Default Re: viscous layer moves
  #4
CycLone
Guest
 
Posts: n/a
Hi Igor,

The "conservative" wall node values actually represent the half volume next to the wall. The "hybrid" values will give you the boundary value (zero for a no-slip wall wall).

I suggest reviewing the documentation on hybrid and conservative values in the CFX on-line documentation. You can also search this forum for many discussions on the topic.

-CycLone
  Reply With Quote

Old   September 17, 2008, 02:26
Default Re: viscous layer moves
  #5
Igor-a
Guest
 
Posts: n/a
Oh, thank you very much for help )))
  Reply With Quote

Old   September 17, 2008, 03:36
Default Re: viscous layer moves
  #6
Igor-a
Guest
 
Posts: n/a
However in Hybrid values contour i see Mach number=0.13 on the no-slip wall...
  Reply With Quote

Old   September 17, 2008, 14:18
Default Re: viscous layer moves
  #7
CycLone
Guest
 
Posts: n/a
Verify the colour details of the surface you are plotting. If the "Conservative" radio button is selected, the plotted values will be zero.

-CycLone
  Reply With Quote

Old   September 19, 2008, 01:24
Default Re: viscous layer moves
  #8
Igor-a
Guest
 
Posts: n/a
Sorry , i was wrong, my problem was influence of friction on matched wall

Thankk for help!
  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
SnappyHexMesh - no layer added bejbro OpenFOAM Mesh Utilities 4 October 16, 2014 19:24
Boundary layer in a pipe Clementhuon OpenFOAM Native Meshers: snappyHexMesh and Others 6 March 12, 2012 13:41
Boundary layer generation problems ivan_cozza OpenFOAM Native Meshers: snappyHexMesh and Others 0 October 6, 2010 13:47
errors Fahad Main CFD Forum 0 March 23, 2004 14:20
boundary layer upon viscous wall Xavier TRICOT Main CFD Forum 2 September 20, 2000 04:40


All times are GMT -4. The time now is 10:50.