Settings for Steckler Room Fire Validation

Set heat transfer coefficients for the surfaces that represent the walls and ceiling.

In the Steckler room fire experiment, the walls and ceiling are composed of conduction brick of thickness 0.1m and conductivity of 0.69W/m-K. Set an effective heat transfer coefficient of 6.9 W/m^2-K for each of the five shell surfaces representing the walls and ceiling of the room.

  1. Expand the Regions > Room > Boundaries > Fire Room node.
  2. Select the Physics Conditions > Thermal Specification node and set Condition to Convection.
  3. Select the Physics Values > Heat Transfer Coefficient node and set Value to 6.9 W/m^2-K.

Switch on the radiation model and set the gray-gas absorptivity to a field function based on temperature:

  1. Open the Continua > Physics 1 node.
  2. Right-click the Models node and select Select Models.
  3. In the Physics Model Selection dialog, select the following models in order:

    Group Box

    Model

    Optional Models

    Radiation

    Radiation

    Participating Media Radiation (DOM)

    Radiation Spectrum (Participating)

    Gray Thermal Radiation

    The Physics Model Selection dialog has the following physics models enabled:

  4. Click Close
  5. Select the Models > Gas > Air > Material Properties > Absorption Coefficient node and set the following properties:
    Node Property Setting
    Absorption Coefficient Method Field Function
    Field Function Scalar Function AbsorTempFunction
  6. Save the simulation.