!----------------------------------------------------------------------- &namdyn_ldf ! lateral diffusion on momentum (default: NO) !----------------------------------------------------------------------- ! ! Type of the operator : ! ! no diffusion: set ln_dynldf_lap=..._blp=F 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 ! ! Coefficient nn_ahm_ijk_t = 0 ! space/time variation of eddy coef ! ! =-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) rn_ahm_0 = 40000. ! horizontal laplacian eddy viscosity [m2/s] rn_ahm_b = 0. ! background eddy viscosity for ldf_iso [m2/s] rn_bhm_0 = 1.e+12 ! horizontal bilaplacian eddy viscosity [m4/s] ! ! Caution in 20 and 30 cases the coefficient have to be given for a 1 degree grid (~111km) /