# implementing continuity equation at walls

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

 LinkBack Thread Tools Display Modes
 November 24, 2003, 14:24 implementing continuity equation at walls #1 Subhra Datta Guest   Posts: n/a wall tangential velocity components will have zero gradients (and zero value) along wall due to no slip and this from differential form of continuity equation (consider 2-D for simplicity)implies wall normal component will have zero gradient on wall (in addition to being zero for non-porous boundaries)... how is this implemented in a cfd code..I read somewhere that while discretizing in Control Volume formulation the first derivative of the normal velocity on faces aligned with walls should be made zero... I have faced some problems when I implemented this (which I will mention in a new thread)...anyone who have success doing this or something similar/more/more appropriate on this line...

 November 25, 2003, 01:24 Re: implementing continuity equation at walls #2 versi Guest   Posts: n/a in Control Volume formulation the first derivative of the normal velocity on faces aligned with walls should be made zero: --> where do you use this derived condition, in normal shear stress, or in pressure Poisson eq.? usually, noslip condition is enough.

 November 25, 2003, 02:58 Re: implementing continuity equation at walls #3 Subhra Datta Guest   Posts: n/a in normal stress..

 November 27, 2003, 00:57 Re: implementing continuity equation at walls #4 Sun Guest   Posts: n/a I agree with versi, no-slip condition is sufficient. Why not leave the gradient of tangential velocity as it is (probably not zero) in the normal stress. It seems to me no need to force it to be zero at all.

 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 xiuying OpenFOAM Running, Solving & CFD 8 August 27, 2013 15:33 klunker FLUENT 0 March 9, 2010 11:46 skabilan OpenFOAM Running, Solving & CFD 12 September 17, 2007 17:48 msrinath80 OpenFOAM Running, Solving & CFD 9 July 22, 2007 02:58 Asghari FLUENT 0 October 11, 2006 04:43

All times are GMT -4. The time now is 22:28.

 Contact Us - CFD Online - Privacy Statement - Top