The Laminar Two-Phase Flow, Phase Field Interface
The Laminar Two-Phase Flow, Phase Field interface () found under the Multiphase Flow>Two-Phase Flow, Phase Field branch (), is a multiphysics interface designed to track the interface between two immiscible fluids. The flow is assumed to be laminar, that is, to be of low to moderate Reynolds number. The fluids can be incompressible or compressible.
When adding the Laminar Two-Phase Flow, Phase Field multiphysics interface, a Laminar Flow and a Phase Field interface are added to the Model Builder. In addition, a multiphysics coupling feature, The Two-Phase Flow, Phase Field Coupling Feature, is added automatically under the Multiphysics node. Note that unlike the Two-Phase Flow, Level Set interfaces, the wetted wall feature here is not implemented as a separate multiphase coupling boundary feature but as a default Wetted Wall feature in the Phase Field interface.
Simulations using the Laminar Two-Phase Flow, Phase Field interface are always time-dependent since the position of an interface almost always depends on its history.
Interface Properties
Turbulence Model
By default the Turbulence model type selected is None. Turbulent flow can be simulated by changing the Turbulence model type to RANS.
Discretization
By default the fluid flow discretization is set to P1+P1, and the phase field discretization is set to Linear. This combination provides improved conservation of the integral of the phase field variable when using the nonconservative form of the phase field equations.