Using the Fluid-Solid Interaction, Viscoelastic Flow, Fixed Geometry (
) interface, you can model phenomena where a deformable solid and a fluid exhibiting a combination of viscous and elastic behavior affect each other. Both the fluid loading on the structure and the structural velocity transmission to the fluid can be taken into account. The interface models situations where the displacements of the solid are assumed to be small enough for the geometry of the fluid domain to be considered as fixed during the interaction.
You add a predefined Fluid-Solid Interaction, Viscoelastic Flow, 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.
Viscoelastic Flow and
Solid Mechanics 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 feature
Fluid-Structure Interaction.
The Viscoelastic Flow interface solves the continuity equation for conservation of mass and the Navier-Stokes equations for the conservation of momentum with an additional elastic stress term. To calculate the extra stress tensor, a number of constitutive relations are available.
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.
The Fluid-Structure Interaction feature is used to couple the interfaces.
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).