Changes between Version 13 and Version 14 of Working Groups/AGRIF


Ignore:
Timestamp:
2017-04-07T15:11:21+02:00 (3 years ago)
Author:
jchanut
Comment:

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  • Working Groups/AGRIF

    v13 v14  
    6161 1. Deckerck, A., Y. Ourmières and A. Molcard (2016) Assessment of the coastal dynamics in a nested zoom and feedback on the boundary current: the North-Western Mediterranean Sea case. Ocean dynamics, 66(11), 1529-1542. 
    6262 1. Müller, V., D. Kieke, P. G. Myers, C. Pennelly and C. Mertens (2017) Temperature flux carried by individual eddies across 47° N in the Atlantic Ocean. J. Geophys. Res. Oceans, 122, !doi:10.1002/2016JC012175. 
    63  
    64 == REPORT OF THE WORKING GROUP MEETING (January 30, 2014) == 
    65 Participants : Rachid Benshila, Daley Calvert, Julien Calandreau, Jérome Chanut, Laurent Debreu, Christian Ethe, Rachel Furner, Claire Levy, Gurvan Madec, Sébastien Masson 
    66  
    67 === 1) Discuss the update of the 3.6 version === 
    68 ==== History : ==== 
    69  * AGRIF version (and corresponding NEMO subroutines) has been updated by Julien Calandreau (INRIA) and Laurent Debreu 
    70  
    71  * Jérome Chanut has made a lot of improvements and bug fixes in his Gilbraltar Strait configuration 
    72  
    73  * Same for Sébastien Masson in the Pulsation ANR project 
    74  
    75  * Other developments in LIM, PISCES 
    76  
    77 ==== Bugs that have been identified and corrected since version 3.4 : ==== 
    78  * zwork array (J. Chanut): a global array  « zwork » was defined in the libmpp module and (due to a bug in the AGRIF converter) this led to several problems and in particular the update step was not performed … 
    79  
    80  * Diffusion coefficients in the corners of the sponge layern were wrong (J. Chanut) 
    81  
    82  * Scale factors were not correctly computed in the ghost cells (where it is assumed that we are in full steps) (J. Chanut) 
    83  
    84 -> same problem for OBC 
    85  
    86  * TKE (S. Masson): near the boundaries, spatial averaging operations led to wrong Kz in the first cell inside the high resolution domain. Extrapolation is possible but does not fulfill the requirement that with, a mesh refinement factor of 1, the obtained solution of the HR grid is identical to a solution computed without a zoom. S. Masson has implemented exchanges of TKE between coarse and fine grids. 
    87  
    88 -> Same problem for GLS and for OBC 
    89  
    90  * Asselin Filter (J. Chanut) : when updating the « after » (n+1) fields, the corresponding corrections of the « now » fields were not done. 
    91  
    92  * arrays out of bound in procnames in MPI (wrong declarations of AGRIF profiles in agrif_declare_variables: jpi, jpj have been replaced by ncli,nlcj) 
    93  
    94 ==== Bugs  / Problems that have been identified ==== 
    95 ·      The bathymetry connection check is not complete (add a check that the coarse grid bathy have been correctly updated) 
    96  
    97 ·      Reproducibility is not guaranteed (due to MPI problem) when ln_spc_dyn is set to true in namelist (which means that we take 0 as special value for dynamics in interpolations/updates). 
    98  
    99 ·      Recursive updates. When more than 1 zoom level are set, the update should start from the highest resolution grid and go recursively to the root grid. Laurent implemented changes that makes this possible. 
    100  
    101  * Use of AGRIF for degradation online (problème de north pole, coarsening) 
    102  
    103  * Average operators with update values 
    104  
    105  * High order operators with coastlines 
    106  
    107  * BDY problem have been solved 
    108  
    109 ==== Improvements ==== 
    110  * AGRIF and time splitting (OK for version 3.6, end of the year, Jérome) 
    111    * only consider forward integration of the forcing mode permits to ensure volume conservation 
    112    * without update of the parent grid right hand side 
    113  * Performance of parallel runs 
    114    * allows the distribution of the processors among the fine grids 
    115  
    116 '''''Rachid Benshila''' is ready be in charge of the merge '' 
    117  
    118 === 2) What are the known open problems ? (not to be solved for 3.6) === 
    119  * Number of ghost cells ('''''L. Debreu''''') 
    120    * Antartic problem (periodicity): require only one ghost cell instead of 2 
    121    * Number of required ghost cells for high order advection schemes may be larger than 2 
    122    * -> Remove hardcoding of the number of ghost cells, do the required modifications to the AGRIF “profiles”  (Laurent) 
    123  
    124  * North fold problem 
    125  
    126  * Timings for each grid 
    127  
    128 === 3) What are the main next developments? === 
    129  * Coupling between grids at the level of the barotropic mode (in time splitting version) (Jérome) 
    130    * requires some modification in the organization of the step routine of NEMO 
    131  
    132  * Vertical grid refinement (Laurent) 
    133  * Online coarsening for tracers using AGRIF (L. Debreu, G. Madec) 
    134  * AGRIF with variable volume 
    135  
    136 === 4) Nesting tools: === 
    137 Two stages: 
    138  
    139 a) for 3.6 version 
    140  
    141  * agree on all the points: bathymetry smoothing, update of coarse grids (take the maximum as default) 
    142  
    143  * Incorporate corrections done by Jean Marc 
    144  
    145  * The nesting tools are only essential for the creation of bathymetry: 
    146    * forcings can be interpolated on the fly 
    147    * -> Do a list available tools for 3D interpolation (initialization / restart fields) 
    148    * For 3.6 keep the 3D fields interpolation in nesting tools 
    149  
    150 b) next version 
    151  
    152  * The definition of vertical coordinates should be done outside NEMO 
    153  
    154  * Nesting tools for the s coordinates 
    155  
    156 ==== 5) Documentation: ==== 
    157  * Update of the nesting tools 3.6 documentation 
    158  
    159  * Update of the users guide: describes what is possible or not with AGRIF. 
    160  
    161  * Documentation for nesting in NEMO/AGRIF: starts from the notes of Sebastien, then circulate the powerpoint 
    162  
    163  * GMD paper 
    164  
    165 === 6) Standard configuration and sanity tests === 
    166 The standard configuration should: 
    167  
    168  * Include more than one level of embedding (test of the recursive update starting from the finer resolution grid(s)) 
    169  
    170  * Uses time splitting 
    171  
    172  * Include a zoom in a sea ice area (Labrador Sea, LIM3) 
    173  
    174  * Include a zoom with PISCES 
    175  
    176  * Zoom in Perou Chili 
    177  
    178 Sanitiy tests 
    179  
    180  * Zoom with a mesh refinement of 1 
    181  
    182  * Test constancy preservation for tracers 
    183  
    184 Longer visions of having AGRIF zoom in AMM 
    185  
    186 S coordinates zoom inside a z coordinate parent grid.