/[MITgcm]/MITgcm/verification/advect_xz/code/GAD_OPTIONS.h

Diff of /MITgcm/verification/advect_xz/code/GAD_OPTIONS.h

Parent Directory | Revision Log | View Revision Graph Revision Graph | View Patch Patch

-revision 1.1 by jmc,
Tue Jan 16 04:42:39 2007 UTC
+revision 1.4 by jmc,
Mon Mar  4 18:41:16 2013 UTC
 Line 5 
 CBOP
  C !ROUTINE: GAD_OPTIONS.h
  C !INTERFACE:
  C #include "GAD_OPTIONS.h"
  C !DESCRIPTION:
  C Contains CPP macros/flags for controlling optional features of package.
  CEOP
  C CPP options file for GAD (Generic Advection Diffusion) package
- C
  C Use this file for selecting options within the GAD package
  #ifndef GAD_OPTIONS_H
  #define GAD_OPTIONS_H
  #include "PACKAGES_CONFIG.h"
- #ifdef ALLOW_GENERIC_ADVDIFF
  #include "CPP_OPTIONS.h"
+ #ifdef ALLOW_GENERIC_ADVDIFF
+ C     Package-specific Options & Macros go here
  C This flag selects the form of COSINE(lat) scaling of bi-harmonic term.
  C *only for use on a lat-lon grid*
  C Setting this flag here only affects the bi-harmonic tracer terms; to
 Line 31 
 C use COSINEMETH_III in the momentum equ
  C This selects isotropic scaling of harmonic and bi-harmonic term when
  C using the COSINE(lat) scaling.
  C Setting this flag here only affects the tracer diffusion terms; to
  C use ISOTROPIC_COS_SCALING of the horizontal viscosity terms in the
  C momentum equations set it CPP_OPTIONS.h; the following line
  C even overrides setting the flag in CPP_OPTIONS.h
  #undef ISOTROPIC_COS_SCALING
 Line 41 
 C introduces excessive recomputation/sto
  C We can disable it here using CPP because run-time flags are insufficient.
  #undef DISABLE_MULTIDIM_ADVECTION
- C This enable the use of 2nd-Order Moment advection scheme (Prather, 1986)
+ C Use compressible flow method for multi-dim advection instead of old, less
- C due to large memory space (10 times more / tracer) requirement,
+ C accurate jmc method. Note: option has no effect on SOM advection which
- C by default, this part of the code is not compiled.
+ C always use compressible flow method.
- #define GAD_ALLOW_SOM_ADVECT
+ #undef GAD_MULTIDIM_COMPRESSIBLE
+ C This enable the use of 2nd-Order Moment advection scheme (Prather, 1986) for
+ C Temperature and Salinity ; due to large memory space (10 times more / tracer)
+ C requirement, by default, this part of the code is not compiled.
+ #define GAD_ALLOW_TS_SOM_ADV
+ C Hack to get rid of negatives caused by Redi.  Works by restricting the
+ C outgoing flux (only contributions computed in gad_calc_rhs) for each cell
+ C to be no more than the amount of tracer in the cell (see Smolarkiewicz
+ C MWR 1989 and Bott MWR 1989).
+ C The flux contributions computed in gad_calc_rhs which are affected by
+ C this hack are:
+ C - explicit diffusion, Redi and the non-local part of KPP
+ C - advection is affected only if multiDimAdvection=.FALSE.
+ C - vertical diffusion (including the diagonal contribution from GMRedi)
+ C   only if implicitDiffusion=.FALSE.
+ C - GM is affected only if GMREDI_AdvForm=.FALSE.
+ C
+ C The parameter SmolarkiewiczMaxFrac (defined in gad_init_fixed.F)
+ C specifies the maximal fraction of tracer that can leave a cell.
+ C By default it is 1.  This will prevent the tracer from going negative
+ C due to contributions from gad_calc_rhs alone.  In the presence of other
+ C contributions (or roundoff errors), it may be necessary to reduce this
+ C value to achieve strict positivity.
+ C
+ C This hack applies to all tracers except temperature and salinity!
+ C Do not use with Adams-Bashforth (for ptracers)!
+ C Do not use with OBCS!
+ #undef  GAD_SMOLARKIEWICZ_HACK
  #else

 Legend:



Removed from v.1.1
 


changed lines


 
Added in v.1.4
 Legend:



Removed from v.1.1
 


changed lines


 
Added in v.1.4
-Removed from v.1.1
+Added in v.1.4

	ViewVC Help
Powered by ViewVC 1.1.22