# Goldstheins Singularity

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

 July 17, 2000, 13:59 Goldstheins Singularity #1 Philip Guest   Posts: n/a Anybody have any idea on the relevance of Goldstheins singularity in relation to BL flow. Regards

 July 18, 2000, 15:14 Re: Goldstheins Singularity #2 John C. Chien Guest   Posts: n/a (1). If you type "goldstein singularity" into a web search site, you will get more information about it. (2). The Prandtl 1904 boundary layer theory provided simplified set of equation for wall boundary layer region. The equation is parabolic and can be solved by marching method (in the downstream direction). (3). The boundary layer equation has the outer boundary condition on the velocity distribution in the streamwise direction (or the pressure distribution in the streamwise direstion) as the input condition. (4). For adverse pressure gradient condition, the boundary layer solution will exhibit singular behavior at the point of separation. (5). In other words, one can not find the solution near, at, and after the point of separation using the boundary layer equation.(due to adverse pressure gradient imposed on the boundary layer equation) (6). Somehow this limitation was related to Goldstein's work in late 40's. (7). If you are solving modern Navier-Stokes equations or Reynolds averaged equations, you don't have this built-in limitation due to simplification of governing equations. (8). It simply says that the simplified boundary layer equation can not handle flow separation, because it is singular at the point of separation. The boundary layer equation is good for "attached flows" only.

 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 skabilan OpenFOAM Running, Solving & CFD 12 September 17, 2007 17:48 msrinath80 OpenFOAM Running, Solving & CFD 9 July 22, 2007 02:58 litonx OpenFOAM Running, Solving & CFD 1 February 21, 2007 02:32 liugx212 OpenFOAM Running, Solving & CFD 3 January 4, 2006 19:07 Bigarella Main CFD Forum 16 August 6, 2002 18:23

All times are GMT -4. The time now is 22:39.

 Contact Us - CFD Online - Top