!----------------------------------------------------------------------- &namdyn_ldf ! lateral diffusion on momentum (default: NO selection) !----------------------------------------------------------------------- ! ! Type of the operator : ln_dynldf_OFF = .false. ! No operator (i.e. no explicit diffusion) ln_dynldf_lap = .false. ! laplacian operator ln_dynldf_blp = .false. ! bilaplacian operator ! ! Direction of action : ln_dynldf_lev = .false. ! iso-level ln_dynldf_hor = .false. ! horizontal (geopotential) ln_dynldf_iso = .false. ! iso-neutral (lap only) ! ! Coefficient nn_ahm_ijk_t = 0 ! space/time variation of eddy coefficient : ! ! =-30 read in eddy_viscosity_3D.nc file ! ! =-20 read in eddy_viscosity_2D.nc file ! ! = 0 constant ! ! = 10 F(k)=c1d ! ! = 20 F(i,j)=F(grid spacing)=c2d ! ! = 30 F(i,j,k)=c2d*c1d ! ! = 31 F(i,j,k)=F(grid spacing and local velocity) ! ! = 32 F(i,j,k)=F(local gridscale and deformation rate) ! ! time invariant coefficients : ahm = 1/2 Uv*Lv (lap case) ! ! or = 1/12 Uv*Lv^3 (blp case) rn_Uv = 0.1 ! lateral viscous velocity [m/s] (nn_ahm_ijk_t= 0, 10, 20, 30) rn_Lv = 10.e+3 ! lateral viscous length [m] (nn_ahm_ijk_t= 0, 10) ! ! Smagorinsky settings (nn_ahm_ijk_t= 32) : rn_csmc = 3.5 ! Smagorinsky constant of proportionality rn_minfac = 1.0 ! multiplier of theorectical lower limit rn_maxfac = 1.0 ! multiplier of theorectical upper limit ! ! iso-neutral laplacian operator (ln_dynldf_iso=T) : rn_ahm_b = 0.0 ! background eddy viscosity [m2/s] /