Target Reference
This section provides information on the properties available for all types of mapping targets. A mapping operation can have several targets for each source.
Target Specifications Right-Click Actions
- New Group
- Adds a new target of one of the following types:
- Surface—allows you to interpolate source data to target surfaces.
- Volume—allows you to interpolate source data to target volumes.
- Beam—allows you to interpolate source data to a target beam.
Surface, Volume, and Beam Target Properties
- Target Entities
- Specifies the target to map data to:
- For surface targets, you can specify one or more surfaces to map data to. The target surfaces can either be 2D regions, region boundaries, part surfaces, or surfaces defined on an imported CAE model.
- For volume targets, you can specify one or more volumes to map data to. The target volumes can either be Simcenter STAR-CCM+ regions or parts, or volumes defined on an imported CAE model.
- For beam targets, you can specify a single beam to map data to. The target beam can only be an imported CAE beam.
- Target Stencil
- Specifies the location on the target mesh where the mapper maps the solution
data. When mapping to finite volume (FV) meshes, the target stencil is most
likely either a cell or a face. When mapping to finite element (FE) meshes,
the target stencil is typically a vertex. Choosing the wrong combination of
stencils reduces the integrity of the mapping operation.
- Face
- Interpolates the source data to the target mesh faces. Typically, this stencil is appropriate for target surfaces on a finite volume mesh, for example boundaries or part surfaces of a Simcenter STAR-CCM+ FV model. This option is only available for surface targets.
- Cell
- Interpolates the source data to the target mesh cell centroids. Typically, this stencil is appropriate for target volumes with finite volume mesh, for example regions or parts of a Simcenter STAR-CCM+ FV model. This option is only available for volume targets.
- Vertex
- Interpolates the source data to the target mesh vertices.
Typically, this stencil is appropriate for target surfaces,
volumes, and beams with finite element mesh. For example, part
surfaces, parts, or regions of Simcenter STAR-CCM+ FE models, surfaces or volumes
of imported FE models, imported beams. This option is available
for all types of targets and is the only option available for
beam targets.
Note When mapping beam data to surfaces, set the target surfaces stencil to Vertex, as the morpher uses the surface nodal displacements to update the mesh.
- Target Source Transform(Expert)
- Specifies the transform to project targets on the sources.
- Idealization Transform
- In simulations that contain idealizations such as extrusions, symmetry planes, and periodic interfaces (see Idealizations), this transform maps data from the idealized (reduced) source model to the realized target model. Depending on the idealization, this transform is available for surface-to-surface, surface-to-volume, and volume-to-volume mapping.
- Identity Transform
- Uses the original target points. This transform is available when mapping from any type of source to any type of target.
- Simple Transform
- Rotates, translates, or scales the target points.
This transform is available for surface-to-surface and volume-to-volume mapping. This option adds a subnode called Simple Transform. See Target Source Transform Reference.
- Normal Projection Transform
- Projects the points in the normal direction onto the source surface This transform is available for surface-to-volume mapping.
- Helical Projection Transform
- Projects the points onto the source surface using a helical path. This transform is available for surface-to-volume mapping. This option adds a subnode called Helical Projection Transform. See Target Source Transform Reference.
- Interpolation Method
- Specifies the data interpolation scheme. Each method uses reciprocity
between connected faces to ensure two-way flows of data and enhances
stability and robustness. For more information, see Solution
Data Interpolation.
- Shape Function
- The interpolation stencil is determined using shape functions, which are special relations between vertices. This method is available for vertex source surface data location.
- Least Squares
- The interpolation stencil includes the nearest neighbor and its immediate neighbors, weighted by the distance between the source and target data locations. If the source and target are coincident, the resultant weight at that location is one. This method is available for any source and target surface and volume data locations.
- Nearest Neighbor
- The interpolation stencil includes only the nearest neighbor. The weight of the nearest neighbor in the stencil is 1, and is therefore the only value included in the interpolation. This method is available for any source and target surface and volume data locations.
- Exact Imprint
- Uses a maximum radius of the target face to find the source faces to include in the interpolation stencil. The maximum radius is the distance from the target face centroid to one of its vertices. The target and source faces are intersected and the weights are the areas of the subfaces that match up between the target and sources. This method is available when mapping between surfaces. Since exact imprinting is computationally intensive to find exact intersections, this method relies on a proximity check to determine the stencil.
- Approximate Imprint
- As with the exact imprint method, except that the weights include all source faces that are found within the maximum radius, and do not depend on the intersecting process. This method is available when mapping between surfaces.
- Conservative Enclosed Face
- This conservative method is developed to map solution from faces of a fine FV surface mesh to the vertices of a coarse FE surface mesh. This approach identifies the enclosing coarse mesh face for every face centroid of the fine mesh. The field values from the fine mesh faces are then interpolated to the vertices of their corresponding enclosing faces using inverse distance weighting with conservative constraint.
- Conservative Maximum Distance
- This conservative method is developed to
map solution from faces of a fine FV surface mesh to the
vertices of a coarse FE surface mesh. This approach identifies
the fine mesh faces (based on Maximum Distance and
Number of Influencing
Nodes) that contribute to each vertex
of the coarse mesh. The mapped field on each coarse mesh vertex
is computed as a weighted-sum of the solution from its
influencing faces. The interpolation weights are based on
rational functions of distance with conservative
constraint.
You are advised to specify Maximum Distance with the target element size and Number of Influencing Nodes with number of vertices per element—3 for triangle, 4 for quadratic.
- Use Original Mesh
- When activated, instructs the data mapper to use the original mesh as the reference mesh for mapping. When deactivated, the data mapper uses the current mesh as the reference mesh for mapping. See Mapping Between Structure And Fluid Grids.
- Limiter
- If this option is beyond the range of the contributing stencil values, it
specifies how the mapped value is limited.
- Min/Max of Contributing Stencil
- Limits the mapped value based on the values of the points chosen for interpolation.
- Min/Max of Contributing Sources
- Limits the mapped values to the minimum/maximum of the source surface/volume. This option allows more extrapolation as compared to the first option.
- No Limiting. Allow Extrapolation
- Allows extrapolation and does not limit the mapped value.
- Boundary Map Option(only for volume targets)
- Determines how the mapper maps data from the source volumes to the boundary
faces of the target volumes for volume targets.
- Map from Boundaries of Source Volumes
- Use if the boundaries of the target and source volume coincide (even though the meshes are different).
- Map from Interior of Source Volumes
- Use if the target volume is only a portion of a larger source
volume.
Note For Simcenter STAR-CCM+ Co-simulation, this option is the only option supported.
- Target Grouping Threshold(only for surface targets)
- Data mappers group multiple target surfaces to perform mapping operations. The Target Grouping Threshold option allows you to specify the number of target surface faces per process that are searched by the mapper. A large input results in fewer searches, but may increase the memory usage.