{
    "grids": {
        "grid": {
            "x": { "linspace": { "start": -5, "end": 5, "steps": 100 } },
            "y": { "linspace": { "start": -5, "end": 5, "steps": 100 } },
            "boundary_conditions": {
                "south": "this",
                "north": "this",
                "east": "this",
                "west": "this"
            },
            "operators": {
                "xi": "upwind9",
                "eta": "upwind9"
            }
        }
    },

    "initial_conditions": {
        "vortex": {
            "vortices": [{
                "x0": -1.0,
                "y0": 0.0,
                "rstar": 0.5,
                "eps": 1.0
            }],
            "mach": 0.5
        }
    },
    "integration_time": 2.0
}