{
  "TopologyOptimizationExample": "box","//": "USER DEFINED project name",
  "material": {
    "E": 7.2e10,  "//": "Young's modulus",
    "poisson_ratio": 0.3, "//": "Poisson's ratio",
    "thermal_conductivity":237, "//unit": "W/(m*K)",
    "thermal_expansion_coefficient": 2.321e-5, "//unit": "1/K"
  },
  "topology": {
    "max_loop": 150,"//": "Maximum number of iterations for topology optimization",
    "volfrac": 0.3,"//": "0~1, Volume ratio restriction",
    "penal": 3.0,"//": "Useless",
    "r_min": 1.05,"//": "Convolution kernel size, less than 1 will result in checkerboard phenomenon",
    "T_ref": 293.15,"//": "K, Reference/Environment temperature",
    "T_limit": 294,"//": "K, Maximum temperature limit in optimization",
    "R_E": 28,"//": "1~28, The higher the value, the closer the density is to 0 or 1",
    "R_lambda": 28,"//": "1~28, The higher the value, the closer the density is to 0 or 1",
    "R_beta":0,"//": "Useless"
  },
  "model": {
    "regular_model": {
      "lx": 100,"//": "A lx * ly * lz rectangle",
      "ly": 30,
      "lz": 30
    }
  },
  "mechanical_boundary_condition":{ "//": "A  [min[0],max[0]] * [min[1],max[1]] * [min[2],max[2]] rectangle boundary",
    "//": "NBC: Neumann boundary condition; DBC: Dirichlet boundary condition",
    "NBC": [
      {
        "min": [-0.01, 0.97, -0.01],"//": "0~1, A [min[0],max[0]] line, because y and z are the same",
        "max": [1.01, 1.01, 1.01],"//": "0~1",
        "val": [0, -1e9, 0],"//": "Pa, The z direction is subject to a -1e8 load"
      }
    ],
    "DBC": [
      {
        "min": [-0.01, -0.01, -0.01],
        "max": [1.01, 0.05, 1.01],
        "dir": [1, 1, 1],"//": "0 or 1, indicates whether xyz directions are fixed"
      }
    ]
  },
  "thermal_boundary_condition": {
    "NBC": [
      {
        "min": [-0.01, 0.97, -0.01],
        "max": [1.01, 1.01, 1.01],
        "heat_flux": 0.18, "//": "W, >=0,18.355 for 324"
      }
    ],
    "DBC": [
      {
        "min": [0.07, 0.45, -0.01],
        "max": [0.12, 0.58, 1.01],
        "temperature": 293.15, "//": "K, fixed temperature in DBC"
      },
      {
        "min": [0.27, 0.40, -0.01],
        "max": [0.32, 0.55, 1.01],
        "temperature": 293.15, "//": "K, fixed temperature in DBC"
      },
      {
        "min": [0.46, 0.40, -0.01],
        "max": [0.53, 0.55, 1.01],
        "temperature": 293.15, "//": "K, fixed temperature in DBC"
      },
      {
        "min": [0.67, 0.40, -0.01],
        "max": [0.72, 0.55, 1.01],
        "temperature": 293.15, "//": "K, fixed temperature in DBC"
      },
      {
        "min": [0.87, 0.40, -0.01],
        "max": [0.92, 0.57, 1.01],
        "temperature": 293.15, "//": "K, fixed temperature in DBC"
      }
    ]
  }
}