feat(edmfx): add horizontal diffusion of prognostic EDMFX updrafts - #4659
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📖 Docs preview for this PR: https://clima.github.io/ClimaAtmos.jl/previews/PR4659/ |
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Diffuse the prognostic updraft variables horizontally, mirroring `edmfx_vertical_diffusion` with the mixing length limited by the horizontal node spacing: moist static energy and total specific humidity at `K_h`, and the updraft SGS tracers at `α_vert_diff_tracer · K_h`, all weighted by the updraft density. The updraft dry-air mass is unchanged by the water flux, so `ρa` receives the counterpart tendency `ρa/(1 - q_tot)` times the `q_tot` tendency, mirroring the hyperdiffusion treatment. Always explicit; enabled by the opt-in `edmfx_horizontal_diffusion` config option (default false). Extend the tests: horizontally uniform updraft fields produce no tendency, perturbed fields produce one with the stated `ρa`/`q_tot` pairing, and the single-column tendency is identically zero.
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Diffuses the prognostic updraft variables horizontally, mirroring
edmfx_vertical_diffusionwith the mixing length limited by the horizontal node spacing: moist static energy and total specific humidity atK_h, and the updraft SGS tracers atα_vert_diff_tracer · K_h, all weighted by the updraft density. The updraft dry-air mass is unchanged by the water flux, soρareceives the counterpart tendencyρa/(1 − q_tot)times theq_tottendency, mirroring the hyperdiffusion treatment. Always explicit; enabled by the opt-inedmfx_horizontal_diffusionconfig option (defaultfalse), separate from the grid-meanedmfx_sgs_horizontal_diffusive_fluxoption in the same wayedmfx_vertical_diffusionis separate fromedmfx_sgs_diffusive_flux.Extends the tests: horizontally uniform updraft fields produce no tendency, perturbed fields produce one with the stated
ρa/q_totpairing, and the single-column tendency is identically zero.