# compute bondary layer thickness

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 May 30, 2006, 03:56 compute bondary layer thickness #1 Ralf Schmidt Guest   Posts: n/a Hi! How to compute the thickness of the boundary layer?? Ok, it is the distance to the wall, where the vel. is 99% of the outer vel. It is possible to create a iso-surface for that value... But what I want is a xy-plot (or a profile) on my surface of the B-L thickness. Any Idea? Ralf

 May 30, 2006, 04:28 Re: compute bondary layer thickness #2 Steve Silvester Guest   Posts: n/a Hi, You could do an iso-clip on a plane normal to the surface using clip values of 99% max velocity and a min a tiny fraction lower. That'll create a surface restricted to your boundary layer thickness which you can then use to create an xy plot on plotting thickness (whatever your co-ordinate normal to the surface is) against position. That does it, I'm fairly sure theres a few ways to go about this though. Regards Steve

 May 31, 2006, 07:35 Re: compute bondary layer thickness #3 Ralf Schmidt Guest   Posts: n/a Thank you, I've got it working now... BUT maybe one can help my with another Problem: What free stream vel. should I use for computation? I simulate a very simple case: turbulent flow over a plate (2D, incompressible calculation (air)) - pressure outlet BC at the top of my domain and at the right side, and a - vel. inlet BC at the left side (the plate is at the bottom). Now (because of displacement due to the B-L. ) the vel. above the plate increases to a value about 5% higher than the inlet vel. What value should I take as free stream vel.??? The top side of the domain has a distance of about 35 times the BL-thickness from the plate. Is that distance to small?? Or are the BC wrong? Any idea? Ralf

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post bejbro OpenFOAM Mesh Utilities 4 October 16, 2014 19:24 prikeyma CFX 3 February 12, 2013 04:19 Clementhuon OpenFOAM Native Meshers: snappyHexMesh and Others 6 March 12, 2012 13:41 ivan_cozza OpenFOAM Native Meshers: snappyHexMesh and Others 0 October 6, 2010 13:47 Fahad Main CFD Forum 0 March 23, 2004 14:20

All times are GMT -4. The time now is 22:16.

 Contact Us - CFD Online - Top