Hi everyone,
I found a ppt "Preliminary results from variable-resolution mesh tests", which discuss about the problem of existence of high-wavenumber modes for variable resolution mesh. If I got it correctly, in core_atmosphere, the default filtering technique is using "config_horiz_mixing = 2d_smagorinsky", in which the diffusion term explicitly added to the equations of motion using the 2nd-order diffusion(Kh). The 4th-order hyperdiffusion(K4) can be adjusted by "config_visc4_2dsmag".
However, if I want to adjust manually by choosing "config_horiz_mixing = 2d_fixed", in what way should I adjust the two options, namely, "config_h_mom_eddy_visc2" and "config_h_mom_eddy_visc4"? It will be great if anyone can tell me more about these two values, such as how they make impact on the simulations, their order of magnitude.
I also discovered that "2d_smagorinsky" option is available for core_atmosphere but not the others, for instance, the core for shallow water wave(core_sw).
Any comments will be appreciated, thanks~
I found a ppt "Preliminary results from variable-resolution mesh tests", which discuss about the problem of existence of high-wavenumber modes for variable resolution mesh. If I got it correctly, in core_atmosphere, the default filtering technique is using "config_horiz_mixing = 2d_smagorinsky", in which the diffusion term explicitly added to the equations of motion using the 2nd-order diffusion(Kh). The 4th-order hyperdiffusion(K4) can be adjusted by "config_visc4_2dsmag".
However, if I want to adjust manually by choosing "config_horiz_mixing = 2d_fixed", in what way should I adjust the two options, namely, "config_h_mom_eddy_visc2" and "config_h_mom_eddy_visc4"? It will be great if anyone can tell me more about these two values, such as how they make impact on the simulations, their order of magnitude.
I also discovered that "2d_smagorinsky" option is available for core_atmosphere but not the others, for instance, the core for shallow water wave(core_sw).
Any comments will be appreciated, thanks~