# Fully Developed Turbulent flow- analytical soln?

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

 November 7, 2000, 02:55 Fully Developed Turbulent flow- analytical soln? #1 Mohammad Kermani Guest   Posts: n/a Hi. Is any way to analytically calculate the velocity profile between two plates in fully developed TURBULENT flow? THanks.

 November 7, 2000, 11:11 Re: Fully Developed Turbulent flow- analytical sol #2 John C. Chien Guest   Posts: n/a (1). I don't think so. (2). But you can always try.

 November 7, 2000, 12:29 Re: Fully Developed Turbulent flow- analytical sol #3 Mohammad Kermani Guest   Posts: n/a 1) If we don't care about shear stress at the wall, is the velocity profile u/u_0 = (y/ (h/2) )^(1/n) a good approximation for channel flow? 2) In this formula, where is the effect of pressure gradient along the channel?? Thanks.

 November 7, 2000, 12:38 Re: Fully Developed Turbulent flow- analytical sol #4 frederic felten Guest   Posts: n/a hi there, You can refer to the following book: "VISCOUS FLUID FLOW" (2nd Edition) Frank, M., White McGraw-Hill, 1991. In the chapter 6 (Section 6-5.2), White proposes a formulation for the average velocity profile across the entire channel. I hope this helps. Sincerely, Frederic Felten CFD Laboratory. UT Arlington, TX, USA. http://utacfdb.uta.edu/

 November 7, 2000, 12:54 Re: Fully Developed Turbulent flow- analytical sol #5 kalyan Guest   Posts: n/a I came across a paper once which used mixing length and scaling arguments to come up with an closed form expression for the mean velocity profile in planar turbulent Couette flow. I think the author's name is Noor but I am not sure. The profile compares fairly well with experiments but I doubt if you can call the method analytical given the assumptions that were used in its derivation.

 November 7, 2000, 16:34 Re: Fully Developed Turbulent flow- analytical sol #6 John C. Chien Guest   Posts: n/a (1). It is just a curve fit. And n is normally a function of the Reynolds number, see Schlichting's Boundary Layer Theory book. (2).The curve fit is good for regions away from the wall, and if you apply the curve fit at the wall, the slope is singular there. (3). In other words, you can not evaluate the wall shear stress from this curve fit. Since the pressure gradient must be balanced by the wall shear stress in the fully developed flow (between the pressure gradient term and the diffusion term, no convection term contribution), the pressure gradient is unknown using this curve fit.

 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 jits_aps90 OpenFOAM Running, Solving & CFD 8 November 17, 2017 09:34 Danro Siemens 8 July 19, 2012 07:22 salman FLUENT 0 November 9, 2006 22:45 Saad Main CFD Forum 5 November 19, 2004 14:22 Fabian CFX 1 September 19, 2001 18:13

All times are GMT -4. The time now is 04:11.

 Contact Us - CFD Online - Privacy Statement - Top