# Jameson's scheme for LES ?

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

 February 23, 2004, 18:25 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, 22:53 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, 22:57 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, 04:45 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, 05:28 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, 07:11 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, 07:49 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, 13:40 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, 13:02 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