# Jameson's scheme for LES ?

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

 February 23, 2004, 19:25 Jameson's scheme for LES ? #1 Li Yang Guest   Posts: n/a Dear all, as we know that the central difference scheme is popular and a common practice for incompressible flow LES, I wonder if Jameson's central difference scheme is also OK for compressible flow LES. Why or why not ? Any references ? Thanks for your reply in advance. Li Yang

 February 23, 2004, 23:53 Re: Jameson's scheme for LES ? #2 Bin Li Guest   Posts: n/a I used the TVD scheme with convective term and central difference scheme in the viscous term. I'm studying the compressible LES.

 February 23, 2004, 23:57 Re: Jameson's scheme for LES ? #3 Apurva Guest   Posts: n/a Hi, I have not tried Jameson for LES, but have used it for incompressible NS. It Works well. Just switch off the shock capturing dissipation terms, At present I am not exactly remembering it. I will give the answer in 1-2 days time. Best of Luck Apurva

 February 24, 2004, 05:45 Re: Jameson's scheme for LES ? #4 Li Yang Guest   Posts: n/a Hi Apurva, Jameson's scheme is indeed OK for relatively low speed flow simulation. What did you mean "switch off the shock capturing dissipation term" ? As far as I know, Jameson's central difference scheme consists of a central differencing term and two artificial viscosity terms. Kind regards Li

 February 24, 2004, 06:28 Re: Jameson's scheme for LES ? #5 Li Yang Guest   Posts: n/a as far as I know, most of people using high order (3rd or 5th order) upwind schemes for compressible flow LES. But those schemes are found still very dissipative. Therefore, I would like to know whether Jameson's central difference scheme will be OK for compresible flow LES where there is no strong shock.

 February 24, 2004, 08:11 Re: Jameson's scheme for LES ? #6 Apurva Guest   Posts: n/a Their are second order and fourth order dissipative terms. One of them is meant for damping the osscilations and avoiding checker-board solution. While second is used for shock capturing and avoiding failure of central difference scheme at Mach 1 (where normal central difference scheme will fail). Please read Jameson, Turkel and Skmidt's paper carefully.

 February 24, 2004, 08:49 Re: Jameson's scheme for LES ? #7 Apurva Guest   Posts: n/a I have a suggession, go through 1997 AIAA Journal, there is a paper by Jonathan Wises (I am not sure of spelling) on preconditioning. Try that method.

 February 24, 2004, 14:40 Re: Jameson's scheme for LES ? #8 Li Yang Guest   Posts: n/a Thanks a lot. I have some further questions about Jameson's scheme, as I wonder how large these artificial viscocity terms could be, compared to the real viscous terms. In addition, can these two artificial viscous terms be switched off for a RANS calculation in a subsonic case ? Will this makes possibly a stable and less dissipative numerical scheme ?

 February 25, 2004, 14:02 Re: Jameson's scheme for LES ? #9 tp Guest   Posts: n/a Implicit Solution of Preconditioned Navier-Stokes Equations Using Algebraic Multigrid. Author(s): Jonathan M. Weiss; Joseph P. Maruszewski; Wayne A. Smith Source: AIAA Journal (American Institute of Aeronautics and Astronautics) Year: 1999 Volume: 37 Number: 1 Pages: 29-36

 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 quarkz Main CFD Forum 6 August 19, 2011 03:24 Far FLUENT 0 May 22, 2011 01:50 iilw1314 Main CFD Forum 3 September 30, 2010 10:43 sebastian_vogl OpenFOAM Running, Solving & CFD 0 January 5, 2009 12:08 Chandra Main CFD Forum 6 February 14, 2007 12:21

All times are GMT -4. The time now is 13:13.