Internal Interface
The internal interface joins two regions within the same continuum.
It can be used to combine together separate regions from the same continuum for in-place interfaces or periodic (cyclic) repeats for Periodic interfaces.
Internal Interface Properties
You can use the properties that are listed below to adjust the specifications of an Internal Interface node.
- Geometry
-
Specifies the geometry source option:
- Boundaries: The interface is a boundary-mode interface, which is created by selecting two boundaries.
- Contacts: The interface is a contact-mode interface. which is defined directly from part contacts.
- Boundary-0
- Indicates the "fixed" side of the interface (Read Only).
- Boundary-1
- Indicates the "adapted" side
of the interface (Read Only).
Vertices from boundary-1 are projected onto boundary-0. The orientation can be swapped through the right-click action Reverse Orientation.
- Type
- Defines the type of interface. Must be set to Internal Interface.
- Topology
- Defines the connection type
between the interfaces:
- In-place—uses the in-place topology.
- Periodic—uses the periodic topology.
- Repeating—uses the repeating topology.
- Connectivity (Internal Interface)
- Defines how the boundaries on the two sides
of the interface are connected. You can select the Metrics-Based manually for a
faster interface computation.
- Conformal—for interfaces within
regions that are discretized using the finite element method. At a
direct interface, finite element models require a conformal match
between the mesh faces on the boundaries that are connected through
the interface.
This connectivity type tries to enforce an exact one-to-one match between the faces on the opposing boundaries.
- Imprinted—for interfaces within regions that are discretized using the finite volume method. The imprinted connectivity type leads to intersected faces.
- Metrics-Based—for interfaces, where the face matching is computed through two parent face indices, one area vector, and one centroid vector. This type connectivity does not calculate any vertex matching.
- Conformal—for interfaces within
regions that are discretized using the finite element method. At a
direct interface, finite element models require a conformal match
between the mesh faces on the boundaries that are connected through
the interface.
- Allow Per-Contact Values
- Allows you to define the interface tolerance
individually for each contact. Activates the child property Specify by Part Subgroup.
注 This property is only valid for contact-mode boundary interfaces. See also: Contact-Mode Boundary Interfaces. - Close Adjacent Cells
- Creates a watertight intersection by fixing
the cell connectivity between the interface faces and side faces along
common edges.
With this option, the topology-based intersector adds extra edges to eliminate the gap between the sides, which reduces spurious oscillations in physical quantities.
This property is only available when the Direct Intersector of the Interface Manager node is set to Topology-Based and the Connectivity of the interface is Imprinted.
注 Close Adjacent Cells is not compatible with DFBI Motion. - Reset on Relative Motion
-
- When activated, the interface is reset when there is any relative motion between the two sides.
- When deactivated, the interface is reset when the relative motion between the two sides exceeds a relative tolerance based upon minimum edge length.
注 This property is only available when the Connectivity of the interface is Imprinted.
Internal Interface Right-Click Actions
- Initialize
- Populates the interface boundary nodes with faces from the original boundaries
- Reset
- Removes initialization for the interface.
- Reverse Orientation
- Swaps the "fixed" and "adapted" sides of the interface.
Physics Values
- Intersection
- Available for all direct interfaces for
controlling the intersection tolerance. The available properties are:
- Specify by Part Subgroup
- Specifies sub-grouping for contact-mode boundary interfaces by which to define independent intersection properties. See also Contact-Mode Boundary Interfaces and 调整交界面相交容差（基于几何的方法）.
- Geometry-Based (Legacy)
- This
Direct
Intersector option activates:
- Geometric Tolerance: Specifies the maximum projection distance of adapted vertices onto the fixed side in terms of a fraction of minimum local edge length around each vertex. For more details, refer to 调整交界面相交容差（基于几何的方法）.
- Topology-Based with Connectivity Imprinted
-
- Match Outer
Boundary: when activated,
indicates that the interface boundaries are expected to
fully overlap on large-scale topological features.
Activate this option only when you expect a complete
match of the two boundaries of an interface.
By default, this property is deactivated.
- Projection
Tolerance: maximum orthogonal
projection distance in terms of a fraction of local
element diameter. Places a limit on how the vertices of
the adapted side get projected onto the fixed side. In
cases where the two interface boundaries are separated
by greater distances, you can increase the Projection Tolerance value to
get fewer remainder faces.
By default, the tolerance is set to 0.2.
- Angle
Threshold: maximum angle (deg)
by which the intersector identifies large-scale features
that are mapped from the adapted side onto the fixed
side. To preserve sharper features, specify a smaller
Angle Threshold value. If
the boundary meshes have spurious defects, you can
specify a larger value.
By default, the value is set to 45 deg.
- Match Outer
Boundary: when activated,
indicates that the interface boundaries are expected to
fully overlap on large-scale topological features.
Activate this option only when you expect a complete
match of the two boundaries of an interface.
- Topology-Based with Connectivity Conformal
-
- Conformal
Tolerance: detects conformal
faces in terms of a fraction of local element diameter.
If too many conformal faces are matched then you can
lower the value. If too few, it can be increased.
By default, the value is set to 0.01
- Nonconformal
Tolerance: detects
non-conformal faces in terms of a fraction of local
element diameter. If too many non-conformal faces are
matched then you can lower the value. If too few, it can
be increased.
By default, the value is set to 0.01
- Conformal
Tolerance: detects conformal
faces in terms of a fraction of local element diameter.
If too many conformal faces are matched then you can
lower the value. If too few, it can be increased.
- Metrics-Based
-
- Match Outer
Boundary: when activated,
indicates that the interface boundaries are expected to
fully overlap on large-scale topological features.
Activate this option only when you expect a complete
match of the two boundaries of an interface.
By default, this property is deactivated.
- Match Feature Curves: when activated, the remainder (unintersected) faces are reduced if the meshes have edge features that match up along feature curves.
- Projection
Tolerance: maximum orthogonal
projection distance in terms of a fraction of local
element diameter. Places a limit on how the vertices of
the adapted side get projected onto the fixed side. In
cases where the two interface boundaries are separated
by greater distances, you can increase the Projection Tolerance value to
get fewer remainder faces.
By default, the tolerance is set to 0.2.
- Angle
Threshold: maximum angle (deg)
by which the intersector identifies large-scale features
that are mapped from the adapted side onto the fixed
side. To preserve sharper features, specify a smaller
Angle Threshold value. If
the boundary meshes have spurious defects, you can
specify a larger value.
By default, the value is set to 45 deg.
- Match Outer
Boundary: when activated,
indicates that the interface boundaries are expected to
fully overlap on large-scale topological features.
Activate this option only when you expect a complete
match of the two boundaries of an interface.
If the intersection fails, a message is displayed in the output window.