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Finch examples

Examples included in Finch are scan path creation and various versions of a single line additive case.

Finch inputs

All inputs are passed to Finch in a JSON format.

Temporal parameters (time)

  • start_time: Simulation start time
    • units: s
  • end_time: Simulation end time
    • units: s
  • Co: Courant number
    • units: unitless
  • total_output_steps: Frequency to output simulation data (across the full grid)
    • units: unitless
  • total_monitor_steps: Frequency to output timing information
    • units: unitless

Spatial parameters (space)

  • initial_temperature: Initial temperature at all grid points
    • units: K
  • cell_size: Grid cell size
    • units: m
  • global_low_corner: Bottom corner of the physical domain
    • units: m
  • global_high_corner: Top corner of the physical domain
    • units: m
  • ranks_per_dim: MPI ranks per dimension (replaced if incompatible with resource set)
    • units: unitless
    • optional (defaults to MPI-determined cartesian domain decomposition)

Material properties (properties)

  • density: Material density
    • units: kg/m^3
  • specific_heat: Specific heat capacity
    • units: J/g/K
  • thermal_conductivity: Thermal conductivity
    • units: W/m/K
  • latent_heat: Latent heat of fusion
    • units: J/kg
  • solidus: Solidus temperature
    • units: K
  • liquidus: Liquidus temperature
    • units: K

Laser source parameters (source)

  • absorption: Laser absorption
    • units: unitless
  • two_sigma: Laser beam radius (half D4_sigma beam diameter)
    • units: m
  • scan_path_file: File containing laser path information

Output sampling (sampling)

This entire section is optional.

  • type: Type of sampling
    • options: solidification_data (outputs sampled solidification data with spatial position x, y, z; melting time tm; solidification start time (time at which the location goes below the liquidus temperature) ts; solidification rate R; and (optionally) temperature gradients Gx, Gy, Gz)
  • format: Output format
    • options: default (output sampled solidification data) and exaca (output only sampled solidification data relevant to ExaCA microstructure prediction: does not output Gx, Gy, Gz)
  • directory_name: Path to save output
    • optional (defaults to "solidification/", within the current directory)

Scan path creation inputs

  • min_point: Lower corner of scan path region
    • units: m
  • max_point: Upper corner of scan path region
    • units: m
  • hatch: Hatch spacing
    • units: m
  • angle: Scan angle
    • units: degrees
  • power: Laser power
    • units: W
  • speed: Laser scan speed
    • units: m/s
  • dwell_time: Dwell time
    • units: degrees
  • bi_direction: If true, reverse the scan direction for every line
    • boolean
    • optional (defaults to true)