{
    "grids": {
        "default": {
            "operators": {
                "xi": "upwind9",
                "eta": "upwind9"
            }
        },
        "grid0": {
            "x": { "linspace": { "start": -5, "end": 5, "steps": 101 } },
            "y": { "linspace": { "start": 0, "end": 5, "steps": 50 } },
            "boundary_conditions": {
                "south": { "multi": [{"neighbour": "grid1", "start": 0, "end": 61}, {"neighbour": "grid2", "start": 0, "end": 41}] }
            }
        },
        "grid1": {
            "x": { "linspace": { "start": -5, "end": 1, "steps": 61 } },
            "y": { "linspace": { "start": -5, "end": 0, "steps": 50 } },
            "boundary_conditions": {
                "north": { "multi": [{"neighbour": "grid0", "start": 0, "end": 61}] },
                "east": { "neighbour": "grid2" }
            }
        },
        "grid2": {
            "x": { "linspace": { "start": 1, "end": 5, "steps": 41 } },
            "y": { "linspace": { "start": -5, "end": 0, "steps": 50 } },
            "boundary_conditions": {
                "north": { "multi": [{"neighbour": "grid0", "start": 60, "end": 101}] },
                "west": { "neighbour": "grid1" }
            }
        }
    },
    "integration_time": 2.0,
    "initial_conditions": {
        "vortex": {
            "vortices": [{
                "x0": 0.0,
                "y0": 0.0,
                "rstar": 0.5,
                "eps": 1.0
            }],
            "mach": 0.5
        }
    },
    "boundary_conditions": "initial_conditions"
}