The compressible::fixedMultiPhaseHeatFlux is a boundary condition that calculates a wall temperature that produces the specified overall wall heat flux across all the phases in an Eulerian multi-phase simulation.

Intended to be used with the copiedFixedValue condition to ensure that phase wall temperature are consistent:

  • Set fixedMultiPhaseHeatFlux boundary for one of the phases
  • Use copiedFixedValue for all the other phases.


The condition requires entries in both the boundary and field files.

Boundary file

    type            patch;

Field file

    // Mandatory entries
    type            fixedMultiPhaseHeatFlux;
    q               <scalarField>;

    // Optional entries
    relax           <scalar>;
    Tmin            <scalar>;

    // Inherited entries


Property Description Type Required Default
type Type name: fixedMultiPhaseHeatFlux word yes -
q Heat power [W] or flux [W/m^2] scalarField yes -
relax Relaxation factor scalar no 1.0
Tmin Minimum temperature limit [K] scalar no 273.0

The inherited entries are elaborated in:

  • fixedValueFvPatchField.H

Further information


Source code:



  • Introduced in version v2012