The initial conditions are set for each speedline independently. Typical setup is displayed in Figure . There are two ways how to initialize the fields for the calculation: manually and by field mapping. The manual way means specifying uniform initial value for individual fields that will be solved for.

• The entry “Pressure” sets a constant value of initial pressure throughout the computational domain. The solver will then iteratively improve this initial estimate.
• The entry “Velocity” sets a constant value of initial velocity throughout the computational domain. It is recommended that the initial flow follows the overall expected flow direction, typically along the rotation axis.
• The entry “Temperature” sets a constant value of initial temperature throughout the computational domain.
• The entry “Turbulent energy” sets a constant value of initial turbulent energy throughout the computational domain. This is only needed when using or turbulence model.
• The entry “Turbulent dissipation” sets a constant value of initial turbulent dissipation rate throughout the computational domain. This is only needed when using turbulence mode.
• The entry “Turbulent dissipation rate” sets a constant value of initial turbulent dissipation rate throughout the computational domain. This is only needed when using turbulence mode.

On the contrary, when using the mapped initial condition, the fields will be initialized by results from some other OpenFOAM calculation. The meshes of the old and the new calculation need to be very similar and the boundary patches in both cases must have the same names.

• The entry “Source case” is a path to a directory with a completed TCFD (or generally OpenFOAM) calculation to be used.
• If the selected case is a valid OpenFOAM case, the selection list “Source time” can be used to select a particular (stationary) time result directory from the chosen case.