JSON input introduction

The following JSON example demonstrates a quadcopter model loaded under its self weight.

{
  "version": "0.1",
  "type": "linear_elastic",
  "domain": {
    "geometry_path": "quadcopter.stl",
    "material": {
      "type": "linear_elastic",
      "definition": {
        "E": 210000,
        "nu": 0.3,
        "rho": 0.0000785
      }
    }
  },
  "discretization": {
    "n_elements": [
      32,
      32,
      32
    ],
    "p": 1
  },
  "boundary_conditions": [
    {
      "stl": "quadcopter_fixed.stl",
      "component": 0,
      "type": "dirichlet",
      "value": 0
    },
    {
      "stl": "quadcopter_fixed.stl",
      "component": 1,
      "type": "dirichlet",
      "value": 0
    },
    {
      "stl": "quadcopter_fixed.stl",
      "component": 2,
      "type": "dirichlet",
      "value": 0
    }
  ],
  "postprocessing_entities": [
    {
      "geometry_path": "quadcopter.stl",
      "fields": [
        "displacement",
        "von_mises"
      ]
    }
  ],
  "gravity": [
    0,
    0,
    -1
  ]
}