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Subsection 8.2.1: Rigid Interfaces Up Section 8.2: Contact Subsection 8.2.3: Tied Interfaces

### 8.2.2 Sliding Interfaces

A sliding interface defines a non-penetration constraint between two surfaces. This means that the surfaces are allowed to separate and slide across each other, but are not allowed to penetrate each other. If the contacting parts are biphasic or multiphasic, specialized contact interfaces can be used to allow fluid or solvent to flow across the contact interface when the parts are in contact. The following sliding interfaces are available.
Sliding node-on-facet This is a simple sliding interface that uses a nodal integration rule. Although this interface may be somewhat faster than the other, it is also the least accurate.
Sliding facet-on-facet. This sliding interface is similar to the sliding node-on-facet but uses a more accurate integration rule for evaluating the contact forces.
Sliding-elastic. A sliding interface that uses a different algorithm for detecting contact and evaluating the contact integrals than the sliding node-on-facet and sliding facet-on-facet.
Biphasic contact. This contact interface is similar to sliding-elastic but allows the fluid to flow across the contact interface for a biphasic analysis.
Biphasic-solute contact. This contact interface is similar to sliding-elastic but allows the fluid and the solute to flow across the contact interface for a biphasic-solute analysis.
Multiphasic contact. This contact interface is similar to sliding-elastic but allows the fluid and solutes to flow across the contact interface for a biphasic analysis.
Symmetry Plane. Defines a symmetry plane for emulating axisymmetric analysis.
Subsection 8.2.1: Rigid Interfaces Up Section 8.2: Contact Subsection 8.2.3: Tied Interfaces