CFD Online Logo CFD Online URL
Home > Forums > FLOW-3D

Boundary Layer

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

LinkBack Thread Tools Display Modes
Old   February 21, 2012, 09:39
Default Boundary Layer
New Member
Join Date: Dec 2011
Posts: 20
Rep Power: 7
Jing_min is on a distinguished road
I use f3d 9.3.2. I have modeled a simple spillway. I want to know how to calculate the boundary layer thickness along the spillway?
(There is no output for that)

Jing_min is offline   Reply With Quote

Old   February 21, 2012, 12:49
Senior Member
Jeff Burnham
Join Date: Apr 2010
Posts: 204
Rep Power: 10
JBurnham is on a distinguished road
You'll have to compare the velocity in each cell along the spillway surface to the free-stream velocity (or use the average velocity for the top few cells of flow). When the near-wall velocity reaches 99% of the free-stream velocity, that height above the wall is conventionally assumed to be the boundary layer thickness (e.g., Schlichting "Boundary Layer Theory"). The accuracy of the measurement will be on the order of the cell size. You could use a "neutral file" (see the manual) to specify a number of points and get velocity output for just those points.
JBurnham 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
No layers in a small gap bobburnquist OpenFOAM Native Meshers: snappyHexMesh and Others 6 August 26, 2015 09:38
Grid Independence of Boundary layer Luigi_ Main CFD Forum 0 December 14, 2011 14:42
Boundary Layer Question scottneh STAR-CCM+ 3 September 30, 2010 14:21
3D Boundary Layer Mario FLUENT 0 February 17, 2009 04:40
Trimmed cell and embedded refinement mesh conversion issues michele OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 2 July 15, 2005 04:15

All times are GMT -4. The time now is 19:23.