Using the Fluid-Solid Interaction, Two-Phase Flow, Phase Field, Fixed Geometry (
) interface, you can model phenomena where two immiscible fluids and a deformable solid affect each other. The interface includes a predefined condition for the interaction at the fluid-solid boundaries. The interface between the two fluids is tracked by solving two additional transport equations, one for the phase field variable and one for the mixing energy density.
Using a time-dependent study, the Fluid-Solid Interaction, Two-Phase Flow, Phase Field, Fixed Geometry interface models bidirectional coupling between solids and the fluids. There are, however, special study steps available in order to model one-way fluid-structure interaction. Simulations using the interface are always time-dependent since the position of the interface between the two fluids is almost always dependent of its history.
You add a predefined Fluid-Solid Interaction, Two-Phase Flow, Phase Field, Fixed Geometry interface from the
Fluid-Structure Interaction (
) group in either the
Structural Mechanics branch (
) or the
Fluid Flow branch (
) of the
Model Wizard or
Add Physics windows.
Laminar Flow,
Solid Mechanics and
Phase Field interfaces are then added to the Model Builder.
In addition, the Multiphysics node is added to the Model Builder, which automatically includes the multiphysics coupling features
Fluid-Structure Interaction and
Two-Phase Flow, Phase Field.
For example, if single Laminar Flow and Solid Mechanics interfaces are added, COMSOL Multiphysics adds an empty Multiphysics node. You can choose from the available coupling features, but the modified settings are not included.
Physics nodes are available from the Physics ribbon toolbar (Windows users),
Physics context menu (macOS or Linux users), or right-click to access the context menu (all users).