id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc 1593,dev CNRS-9 & NOC-3 --- lateral diffusion (LDF): simplification and improvements,gm,nemo,"Development branch related to CNRS-9 and NOC-3 actions of 2015 work plan : simplify and improve the lateral diffusion and dissipation in NEMO/OPA generalization of the use of surface scale factors (e1e2 at T, U, V, F points) NB: This development consists in merging the current trunk with the last year work on that subject (see ticket #1260, and the associated branch ​[https://forge.ipsl.jussieu.fr/nemo/browser/branches/2014/dev_CNRS0_NOC1_LDF 2014/dev_CNRS0_NOC1_LDF​] and wiki page ​[https://forge.ipsl.jussieu.fr/nemo/wiki/ticket/1260_CNRS0_NOC1_LDF 1260_CNRS0_NOC1_LDF]. Simplification: (1) define bi-laplacian diffusive operator on dynamics and tracers are re-entrant laplacian (2) change the way the eddy diffusivity and viscosity are specified and controlled by the user. (3) generalize of the use of surface scale factors (4) add a optional read of surface scale factors in coordinate file in case of reduction of the scale factors in some straits. Improvements: (1) introduce Beckers et al. (2000) compact stencil in the cross-isoneutral direction in triads formalism ; (2) introduce in both iso-neutral operator the Method of Stabilizing Correction (Lemarié et al. (2012) ; (3) implement bilaplacian iso-neutral operator (Lemarié et al. (2012) ——— associated branch: [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5721_CNRS9_NOC3_LDF dev_r5721_CNRS9_NOC3_LDF] associated wiki page: [https://forge.ipsl.jussieu.fr/nemo/wiki/ticket/1593_CNRS9_NOC3_LDF 1593_CNRS9_NOC3_LDF] ",Task,closed,normal,,OCE,trunk,,fixed,simplification LDF,