Changes between Version 3 and Version 4 of 2014WP/2014_SystemSimplification_v2
- Timestamp:
- 2014-03-21T11:41:46+01:00 (10 years ago)
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2014WP/2014_SystemSimplification_v2
v3 v4 1 '''Note on system simplification''' 2 [[BR]] 3 [[BR]] 1 '''Note on system simplification''' [[BR]] [[BR]] 4 2 5 3 '''Motivation''': 6 4 7 We need to simplify the code for maintenance, robustness and future evolution (change in time stepping, …etc). This means fewer options, and a consensus on the default (and thus well validated) set of numerics. 8 The idea is to change the current most used choices from : [[BR]] 9 5 We need to simplify the code for maintenance, robustness and future evolution (change in time stepping, …etc). This means fewer options, and a consensus on the default (and thus well validated) set of numerics. The idea is to change the current most used choices from : [[BR]] 6 7 linear filtered free surface zps ocean with TVD, "Madec" iso-neutral diffusion, and standard equation of state ; levitating sea-ice with virtual salt fluxes 10 8 11 9 possibly to :[[BR]] 12 Non linear (vvl), split-explicit (ts) free surface, mixte zps/s-coordinate ocean with 3rd order advection (UBS with rotation of the diffusive part along iso-neutral surfaces), "Griffies" iso-neutral diffusion ; embedded multi-category sea-ice (exact fluxes). 10 11 Non linear (vvl), split-explicit (ts) free surface, mixte zps/s-coordinate ocean with 3rd order advection (UBS with rotation of the diffusive part along iso-neutral surfaces), "Griffies" iso-neutral diffusion ; embedded multi-category sea-ice (exact fluxes). 12 13 13 And this with a removing of obsolescent features and a cleaning of the code. 14 14 15 15 Timing: achievement within 2 years from now for NEMO v4.0 (to be ready for CMIP6, and on time for the foreseen evolution of the time stepping) 16 16 17 Notations: 17 Notations: 18 18 19 '''*'''core action (supported by all system team)19 ''' *''' core action (supported by all system team) 20 20 21 '''-''' desired, butsubject to discussion21 ''' -''' subject to discussion 22 22 23 '''?''' feasible but all conditions required are not yet met 24 [[BR]] 25 [[BR]] 26 '''CHANGE in options used by default''' 23 ''' ?''' feasible but all conditions required are not yet met 27 24 28 '''*''' '''non-linear free surface''': by default ('''WP 2014''') 25 [[BR]] [[BR]] '''I. CHANGE in options used by default''' 26 27 '''*''' '''non-linear free surface''': by default ('''WP 2014''') 29 28 30 29 '''*''' '''filtered free surface''': remove it as well as all its associated solvers (if yes when? 2014?)[[BR]] 31 (required AGRIF with time-splitting, '''done''' in 2013) and deeply tested ('''WP 2014''')32 30 33 '''*''' '''vertical coordinate''' : default option mixte zps/s-tilde coordinate (thus with variable volume level), with mixte zps*/s*, mixte z/s, zps, z and s coordinate system as sub-option (same code used) (2014-2015 ?)31 (required AGRIF with time-splitting, '''done''' in 2013) and deeply tested ('''WP 2014''') 34 32 35 !- tracer solved as thickness weighted tracer: D,,t,,(e,,3t,, T) ('''WP 2014''')33 '''*''' '''vertical coordinate''' : default option mixte zps/s-tilde coordinate (thus with variable volume level), with mixte zps*/s*, mixte z/s, zps, z and s coordinate system as sub-option (same code used) (2014-2015 ?) 36 34 37 !- thickness weighted quantities in the outputs ('''WP2014''')35 !- tracer solved as thickness weighted tracer: D,, t,, (e,, 3t,, T) ('''WP 2014''' ) 38 36 39 !- no more substitute (domzgr_substitute.h90): all e3 always defined at before, now and after time steps ('''partly done''' in 2013, '''achieved''' in 2014). 37 !- thickness weighted quantities in the outputs (''' WP2014''' ) 40 38 41 !- adapte OFF line for tracer to variable volume (2015?) 39 !- no more substitute (domzgr_substitute.h90): all e3 always defined at before, now and after time steps (''' partly done''' in 2013, ''' to be achieved''' in 2014). 40 41 !- adapte OFF line for tracer to variable volume (2015?) 42 42 43 43 '''*''' '''linear ssh''' option set without optimization (i.e. starting from the non-linear case with minimal changes, not optimal changes), or linear case suppressed ?? We should probably keep a linear case for test cases. (2014-2015 ?) 44 44 45 '''*''' 45 '''*''' '''sea-ice''' : embedded sea-ice as default 46 46 47 47 !- suppress levitating sea ice with virtual salt fluxes. (2014 ?) 48 48 49 !- Suppress levitating sea ice with mass exchange (?)CICE issue…49 !- Suppress levitating sea ice with mass exchange (?) CICE issue… 50 50 51 51 !- need land-fast ice ('''WP 2014''') 52 52 53 53 !- need BDY compatibility with embedded sea-ice …. (who when?) 54 54 55 '''-''' '''tracer advection scheme''': diminish their number (?).55 '''-''' '''tracer advection scheme''': diminish their number (?). 56 56 57 !- Typically one module for 2^nd^/4^th^ order and one for a 3^rd^order scheme, both associated with an optional flux limiter to ensure positivity. To be discussed57 !- Typically one module for 2^ nd^ /4^ th^ order and one for a 3^ rd^ order scheme, both associated with an optional flux limiter to ensure positivity. To be discussed 58 58 59 !- Addition of the rotation of the diffusive part of 3^rd^order scheme (2015 ?)59 !- Addition of the rotation of the diffusive part of 3^ rd^ order scheme (2015 ?) 60 60 61 '''-''' '''vertical physics''':simplification versus diversity61 '''-''' '''vertical physics''': simplification versus diversity 62 62 63 !- keep only one (GLS) ? or maintain some diversity? 63 !- keep only one (GLS) ? or maintain some diversity? 64 64 65 !- KPP remove unless if-less KPP is implemented (Lemarié et al 2012). Keeping a validated KPP scheme in the system make sense for comparison purposes. 65 !- KPP remove unless if-less KPP is implemented (Lemarié et al 2012). Keeping a validated KPP scheme in the system make sense for comparison purposes. 66 66 67 !- suppress or keep the explicit vertical diffusion 68 [[BR]] 67 !- suppress or keep the explicit vertical diffusion 69 68 70 '''OBSOLESCENT features''' 71 [[BR]] 72 69 [[BR]] [[BR]]'''II.OBSOLESCENT features''' [[BR]] 73 70 74 71 '''mains''': 75 72 76 '''*''' remove '''LIM2''' : only LIM3 remains in the system (planed 2014)73 ''' *''' remove ''' LIM2''' : only LIM3 remains in the system ('''WP 2014''') 77 74 78 '''*''' remove '''OBC''' : only BDY remains in the system (planed 2013, early 2014)75 ''' *''' remove ''' OBC''' : only BDY remains in the system ('''==>> done in v3.6''') 79 76 80 '''*''' remove '''OASIS''' 3 and 4 : OASIS-MCT (planed 2014)77 ''' *''' remove ''' OASIS''' 3 and 4 : OASIS-MCT ('''WP 2014''') 81 78 82 '''-''' duplicate '''isoneutral operator''': keep only the Griffies' one (tests needed before decision, tests planed in 2014 NOCS+LOCEAN)83 [[BR]] 79 ''' -''' duplicate ''' isoneutral operator''' : keep only the Griffies' one (tests needed before decision, tests planed in 2014 NOCS+LOCEAN) 80 84 81 85 82 '''smaller ones''' 86 83 87 '''-''' '''Non-penetrative convection''' : correct it (using alpha & beta) (L. Brodeau, Stockholm)84 ''' *''' remove ''' acceleration of convergence''' (notably rdttra=F(k) ==> unique rdt) 88 85 89 '''*''' remove '''acceleration of convergence''' (notably rdttra=F(k) ==> unique rdt)86 ''' *''' remove '''Neptune effect''' : ORCA1 runs shows its inefficiency (''' WP 2014''' ). 90 87 91 '''*''' remove Neptune effect : ORCA1 runs shows its inefficiency ('''WP 2014''').88 ''' *''' remove '''no-slip accurate''' option (key_noslip_accurate). Module divcur.F90 (==>> done in branch [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2014 2014/dev_CNRS0_NOC1_LDF] 92 89 93 '''-''' Smagorinsky (?) : use 3rd order operator (UBS) instead and remove it ? 94 [[BR]] 90 ''' *''' suppress cross-land advection 95 91 96 '''I/O''' 92 ''' -''' '''Smagorinsky''' (?) : use 3rd order operator (UBS) instead and remove it ? 97 93 98 '''-''' remove Dimg format (?) (agreement needed from DRAKKAR group)94 ''' -''' '''Non-penetrative convection''' : with its correction and improvement using alpha & beta (work done by L. Brodeau, Stockholm), it seems now vbetter to keep it in the system. 99 95 100 '''?''' remove IOIPSL : 2 issues, still use in some places, and XIOs portability… (''probably much too early to decide that'')101 96 102 '''*''' • use of XIOS logical to control the computation of diagnostics (2014-2015, '''who?''') 103 [[BR]] 104 [[BR]] 97 '''I/O''' 105 98 99 ''' -''' remove Dimg format (?) (agreement needed from DRAKKAR group) 100 101 ''' ?''' remove IOIPSL : 2 issues, still use in some places, and XIOs portability… ('' probably much too early to decide that'' ) 102 103 ''' *''' use of XIOS logical to control the computation of diagnostics (2014-2015, already done LIM3, see [https://forge.ipsl.jussieu.fr/nemo/browser/branches/dev_r4028_CNRS_LIM3_MV2014 dev_r4028_CNRS_LIM3_MV2014]) 106 104 107 105 '''CODE cleaning''' 108 106 109 '''*''' OBS operator : clean the stand-alone implementation ('''WP 2014''')107 ''' *''' LDF: remove 1D and 2D cases, keep only 3D ; laplacian and bilaplacian coefficients defined at the same points (T and F) ; time varying coefficients (Smagorinsky, function of growth rate of baroclinic instabilities): better integration rather than configuration dependent cases ('''on going work''' , 2015 ?) 110 108 111 '''*''' suppress most of the CPP keys, if not all of them (2015 ?)109 ''' *''' OBS operator : clean the stand-alone implementation ('''WP 2014''' ) 112 110 113 '''*''' dynamical allocation: return back to standard allocation (?) (no more '''CALL '''wrk_alloc and '''CALL '''wrk_dealloc) Evaluation to decided what to do ('''WP 2014''')111 ''' *''' suppress most of the CPP keys, if not all of them (2014-2015 ?) 114 112 115 '''*''' no more potential density (zdfnpc and MLD computed from alpha & beta) ('''WP 2014''')113 ''' *''' dynamical allocation: return back to standard allocation (?) (no more ''' CALL ''' wrk_alloc and ''' CALL ''' wrk_dealloc) Evaluation to decided what to do (''' WP 2014''' ) 116 114 117 '''*''' remove all hard coded specific alterations associated with configurations (ORCA,…) while introducing associated input files (2014-2015 ?)115 ''' *''' no more potential density (zdfnpc and MLD computed from alpha & beta) (''' WP 2014''' ) 118 116 119 '''*''' same for the definition of coordinate system (s, mixed z-s): only a simple case hard coded. For more sophisticated cases, the required information should be read in an input file. (2015 ?)117 ''' *''' remove all hard coded specific alterations associated with configurations (ORCA,…) while introducing associated input files (2014-2015 ?) 120 118 121 '''*''' avm defined at t-point ==> suppress avmu, avmv and ~10 lbc_lnk calls(2015 ?)119 ''' *''' same for the definition of coordinate system (s, mixed z-s): only a simple case hard coded. For more sophisticated cases, the required information should be read in an input file. (2015 ?) 122 120 123 '''*''' LDF: remove 1D and 2D cases, keep only 3D ; laplacian and bilaplacian coefficients defined at the same points (T and F) ; time varying coefficients (Smagorinsky, function of growth rate of baroclinic instabilities): better integration rather than configuration dependent cases ('''on going work''', 2015 ?)121 ''' *''' avm defined at t-point ==> suppress avmu, avmv and ~10 lbc_lnk calls (2015 ?)
