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Subsection 3.13.3: Biphasic-Solute and Multiphasic Contact Up Section 3.13: Contact Section Subsection 3.13.5: Tied Interfaces

### 3.13.4 Rigid Wall Interfaces

A rigid wall interface is similar to a sliding interface, except that the secondary surface is a rigid wall. The following properties are defined for rigid wall interfaces:
 Parameter Description Default laugon Augmented Lagrangian flag 0 (false) tolerance augmentation tolerance 0.01 penalty penalty factor 1.0 plane the plane equation for the rigid wall N/A offset the normal offset of the plane defined by the plane parameter 0.0
The plane property defines the reference plane for the rigid wall. Its value is an array of four values:. The actual plane is defined by specifying the offset to the reference plane. The offset parameter takes a loadcurve as an optional attribute to define the motion of the plane as a function of time. The loadcurve defines the offset from the initial position in the direction of the plane normal: So, for example, a rigid wall that initially lies in the xy-coordinate plane and moves in the z-direction would be specified as follows:
<plane>0,0,1,0</plane>
<offset lc="1">1.0</offset>

Subsection 3.13.3: Biphasic-Solute and Multiphasic Contact Up Section 3.13: Contact Section Subsection 3.13.5: Tied Interfaces