16.8.3 Input of Thermal Boundary Conditions and Fuel Inlet Velocities

If your model is non-adiabatic, you should input the Temperature at the flow inlets. Recall that the inlet temperatures were requested during the table construction in the Chemistry tab of the Species Model dialog box, and were used in the construction of the look-up tables. The inlet temperatures for each fuel, oxidizer, and secondary inlet in your non-adiabatic model should be defined, in addition, as boundary conditions in ANSYS FLUENT. It is acceptable for the inlet temperature boundary conditions to differ slightly from those you input for the look-up table calculations. If the inlet temperatures differ significantly from those in the Chemistry tab, however, your look-up tables may provide inaccurate interpolation. This is because the discrete points in the look-up tables were clustered around a finite range of the temperatures defined in the Chemistry tab, and your input in the ANSYS FLUENT inlet boundary condition may fall outside this range.

Wall thermal boundary conditions should also be defined for non-adiabatic non-premixed combustion calculations. You can use any of the standard conditions available in ANSYS FLUENT, including specified wall temperature, heat flux, external heat transfer coefficient, or external radiation. If radiation is to be included within the domain, the wall emissivity should be defined as well. See Section  7.3.14 for details about thermal boundary conditions at walls.