params_parallel_plate.lua

-- Validation test: simulate a plane wave propagating in a parallel plate
-- waveguide with a discontinuity in materials.

sim.name = "twomat"                     -- simulation name
sim.dt = 1e-12                          -- timestep size
sim.timesteps = 20000                   -- num of iterations
sim.gmsh_model = "twomat.geo"           -- gmsh model filename
sim.use_gpu = 0                         -- 0: cpu, 1: gpu
sim.approx_order = 1                    -- approximation order
sim.time_integrator = "leapfrog"
postpro.silo_output_rate = 100
postpro.cycle_print_rate = 10                  -- console print rate

postpro["E"].mode = "nodal"

debug = {};
debug.dump_cell_ranks = true;

function setup_materials()
    local bulk_m1 = volume_physical_group_entities(1);
    for i,v in ipairs(bulk_m1) do
        materials[v] = {}
        materials[v].epsilon = 1
        materials[v].mu = 1
        materials[v].sigma = 0
    end

    local bulk_m2 = volume_physical_group_entities(2);
    for i,v in ipairs(bulk_m2) do
        materials[v] = {}
        materials[v].epsilon = 4
        materials[v].mu = 1
        materials[v].sigma = 0
    end
end

local freq = 3e8
function plane_wave(tag, x, y, z, t)
    local Ex = 0
    local Ey = 0
    local Ez = math.sin(2*math.pi*t*freq)
    return Ex, Ey, Ez
end

function setup_boundary_conditions()
    local source = surface_physical_group_entities(10);
    for i,v in ipairs(source) do
        bndconds[v] = {};
        bndconds[v].kind = "plane_wave_E";
        bndconds[v].source = plane_wave;
    end

    local pmc = surface_physical_group_entities(11);
    for i,v in ipairs(pmc) do
        bndconds[v] = {};
        bndconds[v].kind = "pmc";
    end

    local abc = surface_physical_group_entities(13);
    for i,v in ipairs(abc) do
        bndconds[v] = {};
        bndconds[v].kind = "impedance";
    end
end

function on_mesh_loaded()
    setup_materials();
    setup_boundary_conditions();
end