### General process parameters

Under specific circumstances modifying the general process parameters is necessary,
e.g. for computing latent heat of materials or for experiments in space.

You need to specify the estimated growth rate of the crystal for pseudo-stationary
computations. The growth rate has to be specified in m/s. For
the pure unstructured mesh the growth rate has to be
positive, if the interface between the solid and the liquid phase is moving upwards
in positive z-direction as in VGF furnaces. The growth rate has to be negative,
if the interface is moving down in negative z-direction as in Czochralski furnaces.

For the hybrid mesh the sign of the growth rate doesn't depend on
the crystal growth arrangement. The positive sign affects always
the release of crystallization latent heat and the negative sign
corresponds to to the heat consumption by the "negative growth" or crystal melting.
The same applies if doing tracking on the unstructured mesh, but not using the enthaly method.

### Note

In time-dependent computation the growth rate must be set to 0.

The gas pressure (N/s²) has to be specified for computing convection,
if the ideal gas model has been chosen.

Default is the gravity of the earth (9.81 m/s²). This value is used
to compute buoyancy forces for convection.

The latent heat in J/m³ has to be specified for
computing the phase transition crystal-melt, if it is modeled
by means of the hybrid mesh.

In this case the phase boundary separates two regions filled with
different single phase materials, the crystal region with the
solid phase and the melt region with the liquid phase. Therefore
the phase transition heat isn't refering anymore to a material as it
was the case for the enthalpy method and pure unstructured mesh. In
the enthalpy method the latent heat is entered as a material
property in J/kg. The same value but multiplied with the density
of the crystal is expressed in J/m³ and should be prescribed
as a process parameter for the hybrid mesh model.

The dialog field for the latent heat in the process parameters
window remains hidden if no phase transition on the hybrid mesh is
created. Otherwise it gets visible as shown in the figure below.