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revision 1.1748 by jmc, Thu Oct 11 19:21:39 2012 UTC revision 1.1749 by mlosch, Tue Oct 16 07:08:56 2012 UTC
# Line 4  $Name$ Line 4  $Name$
4      Notes on tags used in MITgcmUV      Notes on tags used in MITgcmUV
5      ==============================      ==============================
6    
7    o pkg/seaice: add Jacobian-free Newton Krylov solver for ice dynamics
8      (Lemieux et al. 2010, 2012). Turn on with the usual SEAICE_ALLOW_JFNK
9      and SEAICEuseJFNK=.true. A few things to note:
10      - involves a FGMRES, that is parallel but very inefficient,
11        because of many scalar products (global sums) in the Gram-Schmidt
12        orthogonalization method. Needs to be replaced. Original code
13        from J.-F. Lemieux
14      - preconditioner for FGMRES is a stripped down version of LSOR
15      - SOLV_MAX_ITERS is now used for LSOR as a solver and as a
16        preconditioner. For the preconditioner, the default is set to 10.
17      - Jacobian times vector is computed with finite differences
18      - marginally related to JFNK-solver: add a smooth regularization for
19        zeta with tanh that will improve convergence (Lemieux and Tremblay,
20        2009) for any implicit solver (not implemented for EVP because EVP
21        does not need this regularization in the first place). Define
22        SEAICE_ZETA_SMOOTHREG in SEAICE_OPTIONS.h to use.
23  o eesupp/src:  o eesupp/src:
24    - check in genmake2 that intrinsic S/R flush is available.    - check in genmake2 that intrinsic S/R flush is available.
25    - add S/R to flush IO unit (if intrinsic S/R flush is available)    - add S/R to flush IO unit (if intrinsic S/R flush is available)
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