This example will run a diffusion flame until the solution reaches quasi steady state as defined by the criteria list given to the time stepper

reactingFlow/steadyStateDiffusionFlame_zerork.yaml

---
test:
  # a unique test name for this integration tests
  name: steadyStateDiffusionFlameZerork
  # create a default assert that compares the log file
  assert: "inputs/reactingFlow/steadyStateDiffusionFlame.zerork.txt"

environment:
  title: _steadyStateDiffusionFlameZerork
  tagDirectory: false
arguments: { }
# Create a stead state stepper.  The Stead State Stepper marches the solution in time until a set of criteria is met
timestepper: !ablate::solver::SteadyStateStepper
  # The Steady state stepper can output using the standard serializers
  io: !ablate::io::Hdf5MultiFileSerializer
    # results are saved at every 0 steps.  In real simulations this should be much larger.
    interval: 0
  # Pass the standard petsc arguments to the TS.
  arguments:
    ts_type: rk
    ts_max_time: 1
    ts_max_steps: 5000 # If convergence is not reached by ts_max_steps an exception is thrown
    ts_dt: 1.0e-10
    ts_adapt_safety: 0.75
  # A list of criteria can be given to the steady state stepper.  All criteria must be met to be considered converged
  criteria:
    # The VariableChange measures the norm between the current and previous variable state.  If less than the tolerance
    # the variable is considered converged
    - !ablate::solver::criteria::VariableChange
      name: temperature
      tolerance: 200 # This should be smaller for non-test cases
      norm: l2_norm
    # The valid range does not check for convergence but throws an error is all points fall outside the valid range.
    # This is useful for checking for invalid results such as flame extinguishment
    - !ablate::solver::criteria::ValidRange
      name: temperature
      lowerBound: 500
      upperBound: 100000
  # state how many time steps will be completed between criteria checks
  checkInterval: 10
  # the steady state steppers allows for a log to monitor convergence rate
  log: !ablate::monitors::logs::StdOut

  # Create a 1D BoxMeshBoundaryCells to monitor the solution
  domain: !ablate::domain::BoxMeshBoundaryCells
    name: simpleBoxField
    faces: [ 50 ]
    lower: [ 0.0 ]
    upper: [ 0.01 ]
    options:
      dm_plex_hash_location: true
    preModifiers:
      # distribute the mesh across the mpi rank with ghost cells
      - !ablate::domain::modifiers::DistributeWithGhostCells
        ghostCellDepth: 2
    postModifiers:
      - !ablate::domain::modifiers::GhostBoundaryCells
    fields:
      - !ablate::finiteVolume::CompressibleFlowFields
        # create an ideal gas eos using the tchem library
        eos: !ablate::eos::zerorkEOS  &eos
          reactionFile: ../mechanisms/gri30.inp
          thermoFile: ../mechanisms/gri30.dat
          options:
            reactorType: ConstantPressure #zerork deafult is constant volume
            # set a minimum temperature for the chemical kinetics ode integration
            thresholdTemperature: 560
        conservedFieldOptions:
          petscfv_type: leastsquares
        region:
          name: domain
      - !ablate::domain::FieldDescription
        name: pressure
        type: FV
        location: aux
        region:
          name: domain
  # provide an initial condition for the flow field
  initialization:
    # Set up the euler field (density, density*energy, density*vel) based upon temperature, pressure, velocity and mass fractions
    - !ablate::finiteVolume::fieldFunctions::Euler
      state: &flowFieldState
        eos: *eos
        temperature:
          "x < 0 ? 653.0  : (x > .01 ? 300.0 : (x < 0.007 ? (306714.2857*x + 653): (-833333.3333*x + 8633.33)  ))"
        pressure: 101325.0
        velocity: "0.0"
        other: !ablate::finiteVolume::fieldFunctions::MassFractions
          &massFracs
          eos: *eos
          values:
            - fieldName: O2
              field: !ablate::mathFunctions::Linear
                startValues: [ 0.0 ]
                endValues: [ 1.0 ]
                end: .01
            - fieldName: H2
              field: !ablate::mathFunctions::Linear
                startValues: [ 2.66E-08 ]
                endValues: [ 0.0 ]
                end: .01
            - fieldName: CH4
              field: !ablate::mathFunctions::Linear
                startValues: [ 0.03130099 ]
                endValues: [ 0.0 ]
                end: .01
            - fieldName: C2H2
              field: !ablate::mathFunctions::Linear
                startValues: [ 0.019041133 ]
                endValues: [ 0.0 ]
                end: .01
            - fieldName: C2H4
              field: !ablate::mathFunctions::Linear
                startValues: [ 0.908560465 ]
                endValues: [ 0.0 ]
                end: .01
            - fieldName: C2H6
              field: !ablate::mathFunctions::Linear
                startValues: [ 0.012981435 ]
                endValues: [ 0.0 ]
                end: .01
            - fieldName: C3H8
              field: !ablate::mathFunctions::Linear
                startValues: [ 0.028115959 ]
                endValues: [ 0.0 ]
                end: .01
    # initialize the conserved mass fractions using the same flow staet
    - !ablate::finiteVolume::fieldFunctions::DensityMassFractions
      state: *flowFieldState

# set the solvers diffusion flame
solvers:
  # The compressible flow solver is required to solve diffusion and reactions in the flow
  - !ablate::finiteVolume::CompressibleFlowSolver
    id: flowField
    # only apply this solver on the main region (no bc cells)
    region:
      name: interiorCells
    # the flow solver requires the equation of state to compute properties
    eos: *eos
    # Allow transport used the Sutherland model
    transport: !ablate::eos::transport::Sutherland
      eos: *eos
    # in addition to the standard processes add chemistry reactions and a pressure fix to keep the diffusion flame at 1 ATM
    additionalProcesses:
      - !ablate::finiteVolume::processes::Chemistry
        eos: *eos
      - !ablate::finiteVolume::processes::ConstantPressureFix
        eos: *eos
        pressure: 101325.0

  # use a fixed inlet to enforce boundary conditions on the right side
  - !ablate::boundarySolver::BoundarySolver
    id: walls
    region:
      name: boundaryCellsRight
    fieldBoundary:
      name: boundaryFaces
    mergeFaces: true
    processes:
      - !ablate::boundarySolver::lodi::Inlet
        eos: *eos

  # use a fixed inlet to enforce boundary conditions on the left side
  - !ablate::boundarySolver::BoundarySolver
    id: slab boundary
    region:
      name: boundaryCellsLeft
    fieldBoundary:
      name: boundaryFaces
    processes:
      - !ablate::boundarySolver::lodi::Inlet
        eos: *eos