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 # System coupling participant library capabilities

 Last update: 17.07.2025 

- Co-simulation with System Coupling
- Standalone mapping within a single, possibly distributed parallel, application.
- Standalone mapping across multiple, possibly distributed parallel, applications \[1\].
- Data transfers across multiple, possibly distributed parallel, applications \[1\].
- Co-simulation analysis type options 
    - Steady coupled analysis
    - Transient coupled analysis
- Co-simulation restarts
- Co-simulation time integration options (transient analysis only) 
    - Implicit
    - Explicit
- Options for communicating co-simulation setup information 
    - System Coupling Participant (SCP) file writing
    - Direct setup communication via socket connection
- Region discretization options 
    - Mesh
    - Point cloud
- Region topology options (mesh discretization type only) 
    - Surfaces
    - Volumes
- Participant Dimension options 
    - 2D
    - 3D
- High-order mesh elements
- Polygons and polyhedral mesh elements
- Support for specifying mesh model (that is, sharing of bounding surface region between two volume regions, etc.)
- Variable tensor type options 
    - Scalar
    - Vector
- Support for intensive and extensive variables
- Real-valued and complex-valued variables
- Element-based and node-based variables
- Integer-valued participant attributes \[2\]
- Real-valued participant attributes with specified dimensionality \[2\]
- Integer-valued variable attributes
- Real-valued variable attributes with specified dimensionality
- Single-valued parameters \[2\]
- N:M mapping (that is, mapping between different numbers of regions on source and on target)
- Mapping of variables with different properties: 
    - Mapping between element-based and node-based variables
    - Mapping between intensive and extensive variables
- Debugging tools 
    - Mesh validity checks
    - Code tracer and log output
    - Standalone mode for co-simulation
- EnSight results writing \[3\]
- Support for MPI parallel processing \[4\]
- Languages supported \[5\] 
    - C++
    - C
    - Fortran
    - Python
- Support for streaming transcript file to System Coupling GUI for co-simulation \[2\]

\[1\] Currently only supported in C++ and Python.

\[2\] Not currently supported in Fortran.

\[3\] EnSight results can be written by the participant library only if the mapping workflow is used.

\[4\] For details, see [Execution in a parallel environment](parallel-execution.md).

\[5\] For details, see [Compiling, linking, and executing applications that use the Participant Library](compiling-linking-executing.md).

Note the following limitations:

- Currently, all values are assumed to be in SI units.
- Currently, mapping across multiple applications is only supported via C++ APIs.