The Deformed Geometry Interface
The Deformed Geometry (dg) interface (), found under the Mathematics>Deformed Mesh>Legacy Deformed Mesh branch () when adding a physics interface, can be used to study how physics changes when the geometry, here represented by the mesh, changes due to an externally imposed geometry change.
The Deformed Geometry interface has been largely replaced by the deformed geometry features in the Deformed Geometry branch under a component. While the interface is slightly more general, the features under the Deformed Geometry branch interact better with other physics interfaces.
The difference between the Deformed Geometry and Moving Mesh interfaces is that the former defines a deformation of the material frame relative to the geometry frame, while the latter defines a displacement of the spatial frame relative to the material frame. The Deformed Geometry interface can be used in cases where the original geometry model shrinks or grows by removal or addition of material. For example, it can be used for shape optimization (geometry shrinks and grows at different places simultaneously), corrosion (geometry shrinks), or electrodeposition (geometry grows).
Settings
The Label is the default physics interface name.
The Name is used primarily as a scope prefix for variables defined by the physics interface. Refer to such physics interface variables in expressions using the pattern <name>.<variable_name>. In order to distinguish between variables belonging to different physics interfaces, the name string must be unique. Only letters, numbers, and underscores (_) are permitted in the Name field. The first character must be a letter.
The default Name (for the first physics interface in the model) is dg.
Domain Selection
The Deformed Geometry interface requires a domain selection which covers all domains in which some physics is active.
Frame Settings
The Geometry shape function list controls the order of polynomials used for representing the geometry shape in the material frame. The same order is used for Lagrange shape functions defining the mesh position in domains where Free displacement has been activated.
Free Deformation Settings
Select the smoothing type for freely deformed domains. Choose between Lagrange, Winslow, and hyperelastic smoothing.
For detailed information about selecting geometric entities (domains, boundaries, edges, and points), see Working with Geometric Entities
For more information about deformed meshes, see The Moving Mesh Interface.
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Domain and Boundary Nodes for Deformed Geometry
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Smoothing Methods
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Common Physics Interface and Feature Settings and Nodes
Electrochemical Polishing: Application Library path COMSOL_Multiphysics/Electromagnetics/electrochemical_polishing