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

momentum equation (Normal to wall)

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

LinkBack Thread Tools Search this Thread Display Modes
Old   July 2, 2006, 23:13
Default momentum equation (Normal to wall)
Posts: n/a
Dear colleagues:

It is well-known that no-slip BCs (u,v,w =0) has been typically applied to stationary wall boundary.

For those of the tangential momentum equation, we can apply the laminar/wall function approach to simulate the effect of wall on the tangential velocity.

How about for the normal momentum equation? I am wondering abt the discretization of momentum equation (normal to the wall) at cell adjacent to the wall boundary, in a cell-centered SIMPLE solver.

The reason I am asking this question is: As I include the Buoyancy term into the z-momentum equation (parallel to gravitational acceleration), i can see some "rising stream" near the ceiling (due to T>Tavg) and "descending stream" near the floor (due to T<Tavg), which is physically non-existence after I have simulated the problem using commercial code. I have quite doubtful about my implementation of my z-momentum discretization at the wall..

Please help..

  Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
[Commercial meshers] tmerge utility creates unwanted interface/walls comes in the final mesh Shoonya OpenFOAM Meshing & Mesh Conversion 11 January 20, 2012 06:23
Constant velocity of the material Sas CFX 15 July 13, 2010 08:56
Derivation of Momentum Equation in Integral Form Demonwolf Main CFD Forum 2 October 29, 2009 19:53
Momentum equation of Darcy's law sambatra OpenFOAM Running, Solving & CFD 2 April 17, 2009 03:27
Problem with momentum equation Francisco Main CFD Forum 4 August 5, 2004 20:04

All times are GMT -4. The time now is 23:59.