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-   -   Jameson's scheme for LES ? (http://www.cfd-online.com/Forums/main/7200-jamesons-scheme-les.html)

 Li Yang February 23, 2004 19:25

Jameson's scheme for LES ?

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 ?

Li Yang

 Bin Li February 23, 2004 23:53

Re: Jameson's scheme for LES ?

I used the TVD scheme with convective term and central difference scheme in the viscous term. I'm studying the compressible LES.

 Apurva February 23, 2004 23:57

Re: Jameson's scheme for LES ?

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

 Li Yang February 24, 2004 05:45

Re: Jameson's scheme for LES ?

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

 Li Yang February 24, 2004 06:28

Re: Jameson's scheme for LES ?

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.

 Apurva February 24, 2004 08:11

Re: Jameson's scheme for LES ?

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).

 Apurva February 24, 2004 08:49

Re: Jameson's scheme for LES ?

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.

 Li Yang February 24, 2004 14:40

Re: Jameson's scheme for LES ?

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 ?

 tp February 25, 2004 14:02

Re: Jameson's scheme for LES ?

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

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