Changes between Version 18 and Version 19 of 2014WP/2014_SystemSimplification_v2
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- 2015-10-25T12:20:59+01:00 (9 years ago)
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2014WP/2014_SystemSimplification_v2
v18 v19 1 1 [[PageOutline]] Last edited [[Timestamp]] 2 2 3 ''' Actions on System Simplication: towards NEMO 4.0'''[[BR]][[BR]]3 '''[[BR]][[BR]]Actions on System Simplication: towards NEMO 4.0'''[[BR]] 4 4 5 '''Motivation''': 6 7 We need to simplify the code for maintenance, robustness and future evolution of the dynamical core. 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]]5 ---- 6 === Motivations : === 7 We need to simplify the code for maintenance, robustness and future evolution of the dynamical core. 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 : 8 8 9 9 linear filtered free surface zps ocean with TVD, and standard iso-neutral diffusion ; levitating sea-ice with virtual salt fluxes 10 10 11 possibly to : [[BR]]11 possibly to : 12 12 13 Non linear (vvl), split-explicit (ts) free surface, mixte zps/s-coordinate ocean with high order advection schemes, triad iso-neutral diffusion (Griffies operator); embedded multi-category sea-ice (exact fluxes).13 Non linear (vvl), split-explicit (ts) free surface, mixte zps/s-coordinate ocean with high order advection schemes, iso-neutral diffusion ; embedded multi-category sea-ice (exact fluxes). 14 14 15 And this with a removing of obsolescent features and a cleaning of the code. 15 And this with a removing of obsolescent features and a cleaning of the code. 16 16 17 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 dynamical core)17 Timing: achievement ~2016 (to be on time for the foreseen evolution of the dynamical core). 18 18 19 19 Notations: 20 20 21 ''' *''' core action (supported by all system team) 22 23 ''' -''' subject to discussion 24 25 ''' ?''' feasible but all conditions required are not yet met 21 ''' *''' core action (supported by all system team)[[BR]]'''-''' subject to discussion[[BR]]'''?''' feasible but all conditions required are not yet met 26 22 27 23 ---- 28 [[BR]] '''I. CHANGE in options used by default''' 29 24 === I. CHANGE in options used by default === 30 25 '''*''' '''non-linear free surface''': by default ('''WP 2015''') ==>> see NOC3 2015 branch 31 26 32 27 '''*''' '''filtered free surface''': remove it as well as all its associated solvers ('''WP 2015''') 33 28 34 pre-requirement, AGRIF with time-splitting ( done in 2013) and deeply tested ( WP 2014 ), ''' DONE (v3.6 stable)'''29 pre-requirement, AGRIF with time-splitting ( done in 2013) and deeply tested ( WP 2014 ), ''' DONE (v3.6 stable)''' 35 30 36 31 '''*''' '''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 ?) 37 32 38 !- tracer solved as thickness weighted tracer: D,, t,, (e,, 3t,, T) (''' WP 2015''') ==>> see NOC3 2015 branch33 !- tracer solved as thickness weighted tracer: D,,t,,(e,,3t,, T) or possibly D,,t,,(e,,1t,,e,,2t,,e,,3t,, T) (''' WP 2015''' ) ==>> see NOC3 2015 branch 39 34 40 !- thickness weighted quantities in the outputs ( WP2014 ) ''' DONE (v3.6 stable)'''35 !- thickness weighted quantities in the outputs ( WP2014 ) ''' DONE (v3.6 stable)''' 41 36 42 37 !- no more substitute (domzgr_substitute.h90): all e3 always defined at before, now and after time steps (WP 2015) ==>> see NOC3 2015 branch … … 54 49 !- Suppress levitating sea ice with mass exchange (?) CICE issue… 55 50 56 !- need the management of grounded-ice & land-fast ice (''' WP 2016''')51 !- need the management of grounded-ice & land-fast ice (''' WP 2016''' ) 57 52 58 53 !- need BDY compatibility with embedded sea-ice …. (who when?) … … 64 59 '''*''' '''vertical physics''': simplification versus diversity 65 60 66 !- keep only one (GLS) ? or maintain some diversity? ==>> ''' keep both TKE and GLS'''61 !- keep only one (GLS) ? or maintain some diversity? ==>> ''' keep both TKE and GLS''' 67 62 68 !- 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. ''' ==>> DONE in '''[https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF]63 !- 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. ''' ==>> DONE in ''' [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF] 69 64 70 !- suppress or keep the explicit vertical diffusion? needed for numerical tests, we keep explicit option, but implicit is the default choice. !- introduce a manager of vertical physics called by step.F90 with the following features: ''' ==>> see ''' [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_ZDF 2015/dev_r5721_CNRS9_NOC3_ZDF] [[BR]] (1) minimization of lvc_lnk communication (remove ~10 lvc_lnk call) ; (2) remove avmu, and avmv ; (3) remove all key_zdf... CPP keys (replaced by namelist logicals) ; (4) remove zdfddm_subsitute.h90 : ave is always defined) ; (5) introduce a separate computation of the shear production term (shared by TKE and GLS) 65 !- suppress or keep the explicit vertical diffusion? needed for numerical tests, we keep explicit option, but implicit is the default choice. 66 !- introduce a manager of vertical physics called by step.F90 with the following features: ''' ==>> see ''' [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_ZDF 2015/dev_r5721_CNRS9_NOC3_ZDF] [[BR]] (1) minimization of lvc_lnk communication (remove ~10 lvc_lnk call) ; (2) remove avmu, and avmv ; (3) remove all key_zdf... CPP keys (replaced by namelist logicals) ; (4) remove zdfddm_subsitute.h90 : ave is always defined) ; (5) introduce a separate computation of the shear production term (shared by TKE and GLS) 71 67 72 68 ---- 73 '''II.OBSOLESCENT features''' [[BR]] 74 69 === II. OBSOLESCENT features === 75 70 '''mains''': 76 71 77 ''' *''' remove ''' LIM2''' : only LIM3 remains in the system (''' WP 2016''')72 ''' *''' remove ''' LIM2''' : only LIM3 remains in the system (''' WP 2016''' ) 78 73 79 ''' *''' remove ''' OBC''' : only BDY remains in the system ''' ==>> DONE in v3.6''' '''stable'''74 ''' *''' remove ''' OBC''' : only BDY remains in the system ''' ==>> DONE in v3.6''' ''' stable''' 80 75 81 ''' *''' remove ''' OASIS''' 3 and 4 : OASIS-MCT instead '''==>> DONE in v3.6 stable'''76 ''' *''' remove ''' OASIS''' 3 and 4 : OASIS-MCT instead ''' ==>> DONE in v3.6 stable''' 82 77 83 ''' -''' duplicate ''' isoneutral operator''': keep only the triad operator (Griffies' one) ? Tests needed before decision. Those tests should be planed in 2016 (NOCS+LOCEAN) ????78 ''' -''' duplicate ''' isoneutral operator''' : keep only the triad operator (Griffies' one) ? Tests needed before decision. Those tests should be planed in 2016 (NOCS+LOCEAN) ???? 84 79 85 80 '''smaller ones''' 86 81 87 ''' *''' remove ''' acceleration of convergence'''(notably rdttra=F(k) ==> unique rdt)82 ''' *''' remove ''' acceleration of convergence''' (notably rdttra=F(k) ==> unique rdt) 88 83 89 ''' *''' remove ''' Neptune effect''' : ORCA1 runs shows its inefficiency. ''' ==>> DONE in '''[https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF]84 ''' *''' remove ''' Neptune effect''' : ORCA1 runs shows its inefficiency. ''' ==>> DONE in ''' [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF] 90 85 91 ''' *''' remove ''' no-slip accurate''' option (key_noslip_accurate). Module divcur.F90 ''' ==>> DONE in '''[https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF]86 ''' *''' remove ''' no-slip accurate''' option (key_noslip_accurate). Module divcur.F90 ''' ==>> DONE in ''' [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF] 92 87 93 ''' *''' suppress ''' cross-land advection''' : this option is hard coded for ORCA_R2_L31 and is nomore used. ''' ==>> DONE in '''[https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF]88 ''' *''' suppress ''' cross-land advection''' : this option is hard coded for ORCA_R2_L31 and is nomore used. ''' ==>> DONE in ''' [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF] 94 89 95 ''' *''' suppress ''' key_traldf_ano'''and the associated possibility of computing lateral diffusion on tracer using only the departure from a given profile. (==>> done in branch [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2014 2014/dev_CNRS0_NOC1_LDF]90 ''' *''' suppress ''' key_traldf_ano''' and the associated possibility of computing lateral diffusion on tracer using only the departure from a given profile. (==>> done in branch [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2014 2014/dev_CNRS0_NOC1_LDF] 96 91 97 ''' -''' ''' Smagorinsky''' : to be removed. ''' ==>> DONE in '''[https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF]92 ''' -''' ''' Smagorinsky''' : to be removed. ''' ==>> DONE in ''' [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF] 98 93 99 ''' -''' ''' Non-penetrative convection''' : with its correction and improvement using alpha & beta (work done by L. Brodeau, Stockholm), it seems now better to keep it in the system. '''==>> DONE in v3.6 stable'''94 ''' -''' ''' Non-penetrative convection''' : with its correction and improvement using alpha & beta (work done by L. Brodeau, Stockholm), it seems now better to keep it in the system. ''' ==>> DONE in v3.6 stable''' 100 95 101 ''' -''' ''' runoffs''': only introduced as lateral flow: remove the option of runoff as surface boundary condition as well as specific treatment in vicinity of river mouths.96 ''' -''' ''' runoffs''' : only introduced as lateral flow: remove the option of runoff as surface boundary condition as well as specific treatment in vicinity of river mouths. 102 97 103 ''' -''' ''' passive tracers''': use trasbc routines for passive tracers to add the river inputs of nutrients98 ''' -''' ''' passive tracers''' : use trasbc routines for passive tracers to add the river inputs of nutrients 104 99 105 100 ---- 106 '''I/O''' 101 === III. I/O === 107 102 108 ''' *'''remove Dimg format (agreement obtained from the DRAKKAR group) (2015) ==>> Italian branch103 ''' *''' remove Dimg format (agreement obtained from the DRAKKAR group) (2015) ==>> Italian branch 109 104 110 ''' ?''' remove IOIPSL : 2 issues, still use in some places, and XIOs portability… ('' ''' probably much too early to decide that'' ''')105 ''' ?''' remove IOIPSL : 2 issues, still use in some places, and XIOs portability… ('' ''' probably much too early to decide that'' ''' ) 111 106 112 ''' *''' use of XIOS logical to control the computation of diagnostics (2014-2015), already done but only for LIM3, see [https://forge.ipsl.jussieu.fr/nemo/browser/branches/dev_r4028_CNRS_LIM3_MV2014 dev_r4028_CNRS_LIM3_MV2014] )[[BR]]generalize its use throughout the code !107 ''' *''' use of XIOS logical to control the computation of diagnostics (2014-2015), already done but only for LIM3, see [https://forge.ipsl.jussieu.fr/nemo/browser/branches/dev_r4028_CNRS_LIM3_MV2014 dev_r4028_CNRS_LIM3_MV2014] )[[BR]] generalize its use throughout the code ! 113 108 114 109 ---- 115 '''CODE cleaning''' 110 === IV. CODE cleaning === 111 ''' *''' LDF: remove 1D and 2D cases, keep only 3D ; laplacian and bilaplacian coefficients defined at the same points (T and F) ; time varying coefficients (function of growth rate of baroclinic instabilities, of the local velocity...): better integration rather than configuration dependent cases. This is also associated with the re-writing of bilaplacian operator on tracer and on dynamics as re-entrant laplacian operator. As a results, curl and div are no more required in the restart file.''' DONE in ''' [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF] 116 112 117 ''' *''' LDF: remove 1D and 2D cases, keep only 3D ; laplacian and bilaplacian coefficients defined at the same points (T and F) ; time varying coefficients (function of growth rate of baroclinic instabilities, of the local velocity...): better integration rather than configuration dependent cases. This is also associated with the re-writing of bilaplacian operator on tracer and on dynamics as re-entrant laplacian operator. As a results, curl and div are no more required in the restart file.''' DONE in ''' [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF]113 ''' *''' OBS operator : clean the stand-alone implementation (''' WP 2015''' ) 118 114 119 ''' *''' OBS operator : clean the stand-alone implementation (''' WP 2015''')115 ''' *''' dynamical allocation: return back to standard allocation (?) (no more ''' CALL ''' wrk_alloc and ''' CALL ''' wrk_dealloc) Evaluation to decided what to do (''' WP 2014''' ) 120 116 121 ''' *''' dynamical allocation: return back to standard allocation (?) (no more ''' CALL ''' wrk_alloc and ''' CALL ''' wrk_dealloc) Evaluation to decided what to do (''' WP 2014''' )117 ''' *''' no more potential density (zdfnpc and MLD computed from alpha & beta) ==>>> ????? 122 118 123 ''' *''' no more potential density (zdfnpc and MLD computed from alpha & beta) ==>>> ?????119 ''' *''' remove all ''' hard coded specific alterations''' associated with configurations (ORCA,…) while introducing associated input files (2014-2015 ?)[[BR]] - strait width reduction in domhgr : ''' ==>> DONE in ''' [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF] [[BR]] - cross-land advection (ORCA2 only) removed ''' ==>> DONE in ''' [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF] 124 120 125 ''' *''' remove all ''' hard coded specific alterations''' associated with configurations (ORCA,…) while introducing associated input files (2014-2015 ?)[[BR]] - strait width reduction in domhgr : ''' ==>> DONE in ''' [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF] [[BR]] - cross-land advection (ORCA2 only) removed ''' ==>> DONE in ''' [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF]121 ''' *''' 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 ?) ''' *''' suppress most of the CPP keys, if not all of them (2015-2016): 126 122 127 ''' *''' 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 ?) ''' *''' suppress most of the CPP keys, if not all of them (2015-2016): 128 129 ''' * ''' LDF simplification ==>> the 9 related keys have been suppressed (''' key_ldfslp''' ; ''' ley_ldftra_eiv''' ; ''' key_traldf_ano''' ; ''' key_traldf_c1d''' , ''' key_traldf_c2d''' , ''' key_traldf_c3d''' ; ''' key_dynldf_c1d''' , ''' dynldf_c2d''' , ''' dynldf_c3d''' ) ''' ==>> DONE in ''' [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF] ''' *''' remove the ''' key_esopa''' option that allow to compile and test all code option that are controlled by a cpp key. ''' ==>> DONE in ''' [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF] 123 ''' * ''' LDF simplification ==>> the 9 related keys have been suppressed (''' key_ldfslp''' ; ''' ley_ldftra_eiv''' ; ''' key_traldf_ano''' ; ''' key_traldf_c1d''' , ''' key_traldf_c2d''' , ''' key_traldf_c3d''' ; ''' key_dynldf_c1d''' , ''' dynldf_c2d''' , ''' dynldf_c3d''' ) ''' ==>> DONE in ''' [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF] ''' *''' remove the ''' key_esopa''' option that allow to compile and test all code option that are controlled by a cpp key. ''' ==>> DONE in ''' [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF] 130 124 131 125 * remove '''key_vectopt_loop''' from all the code except in ''vectopt_loop_substitute.h90'' (it is an obsolescent feature only adapted to vector computers) '''==>> DONE in '''[https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF 2015/dev_r5721_CNRS9_NOC3_LDF] … … 133 127 134 128 ---- 135 '''New ideas to be discussed :''' 136 137 • remove''' key_mpp_rep''' : this option should become the default case ! Global sum without this option should be removed. • 129 === New ideas to be discussed : === 130 • remove''' key_mpp_rep''' : this option should become the default case ! Global sum without this option should be removed. •
