numeric schemes
 

Dear all,

what whould you use for U/k/epsilon etc. . . .

Thanks in advance,
Tobi

The first three solvers should always outperform smoothSolver. GAMG should outperform CG methods when not limited by communication (this is especially true for the pressure equation). If you're in doubt, just run a couple fixed timesteps with each of the solvers and you will very quickly find out where you can save time.

As akidess already said, for p a good choice should be GAMG, for other fields I usually use PBiCG.

BICCG shouldn't be used any more:
source: http://foam.sourceforge.net/docs/cpp/a00098.html

Dear Foamers
Have a look at the following references for more details:

P. K. Khosla, and S. G. Rubin, “A diagonally dominant second-order accurate implicit scheme”, Computers and Fluids, 2:207-209, 1974.

M. R. Hestens, and E. L. Steifel, “Method of conjugate gradients for solving
linear systems”, Journal of Research, 29:409-436, 1952.

D. A. H. Jacobs, “Preconditioned Conjugate Gradient methods for solving
systems of algebraic equations”, Central Electricity Research Laboratories
Report, RD/L/N193/80, 1980.

H. A. Van Der Vorst, “Bi-CGSTAB: A fast and smoothly converging variant of Bi-CG for the solution of nonsymmetric linear systems”, SIAM J. Scientific Computing, 13(2):631-644, 1992.

PBiCG is good.
--
KANNAN