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Client-Server Setup
Simcenter STAR-CCM+ uses a client-server architecture in which the simulation objects are created on the server and the client provides access to these objects for setup and display.
Working With Parallel Servers
A parallel computation is one where the work is computed by more than one process.
Using a Local Multi-Core Workstation

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Client-Server Setup
Simcenter STAR-CCM+ uses a client-server architecture in which the simulation objects are created on the server and the client provides access to these objects for setup and display.
- Client-Server Connections
  Simcenter STAR-CCM+ allows you to connect a client to any running server for which you have access, and also to disconnect clients when you choose. The client version must match the server version for a successful connection. Secure connections require additional inputs.
- Mixed or Double Precision
  Simcenter STAR-CCM+ comes in two versions: a mixed precision version and a double precision version. Both versions are provided on the download area of the Support Center portal.
- Running Simcenter STAR-CCM+ on Linux ARM64
  Simcenter STAR-CCM+ is supported on Linux ARM64 for running simulations in batch mode. The graphical user interface (GUI) is not officially supported in this release. Some other restrictions are in place for this platform, including unsupported modules.
- Launching Simcenter STAR-CCM+ and Working With Simulations
  A Simcenter STAR-CCM+ simulation exists on a server, and is accessed by connecting a client to the server on which the simulation exists.
- Working With Parallel Servers
  A parallel computation is one where the work is computed by more than one process.
  - Parallel Servers and Requirements
    A parallel server is a Simcenter STAR-CCM+ server that is set to run on multiple cores or a cluster of machines when it is first launched.
  - Supported MPI Implementations
    Regardless of whether you use a local multi-core workstation, remote machines, or a remote cluster to run your parallel server, all approaches require an implementation of the Message Passing Interface (MPI).
  - Using a Local Multi-Core Workstation
  - Using a Remote Multi-Core Workstation
  - Using a Group of Machines
  - Troubleshooting Parallel Servers and MPI
    This section contains some troubleshooting tips when working with parallel servers and MPI distributions.
  - Balancing
  - Getting Parallel Help through the Command Line
    You can get information on the parallel options through the command line.
  - Viewing the Partitioning
  - Using Batch Management Systems
    Batch systems manage the allocation of computational jobs to a single large computer or a cluster of smaller computers.
  - Vectorization
    Simcenter STAR-CCM+ uses AVX-2 instructions on all Xeon processors that support the AVX-2 instruction set—currently, the Haswell, Broadwell, and Skylake processors.
  - Running Distributed Parallel Simulations on Multiple Windows Machines
- GPGPU Computation
  The idea behind general-purpose computing on graphics processing units (GPGPU computation) is that you assign computations that are traditionally solved on a CPU (central processing unit) to a graphics processing unit (GPU). The nature of operations on the GPU means that a single unit can deliver computational performance comparable to using many CPUs in parallel. GPGPU computation is only supported for Simcenter STAR-CCM+ servers running under Linux.
- Teamcenter Share
  Teamcenter Share is a collaboration platform that you can access directly within the Simcenter STAR-CCM+ workspace as well as in a web browser. Teamcenter Share allows you to upload and share simulation files and related data, such as Viewer (.sce) files. Through the integration within Simcenter STAR-CCM+, you can download and open files from this platform.
- Command-Line Reference

Using a Local Multi-Core Workstation

If a workstation is a multi-core machine it is convenient to exploit these resources with Simcenter STAR-CCM+, either from the workspace or from the command line. Typically, you can experience a significant decrease in the time that is required to reach a solution, although limits on the parallel efficiency can be experienced due to the sharing of system resources under this architecture.

Starting from the Workspace

To start a simulation on a cluster using the workspace:

Launch the workspace.
- If you are starting a new simulation, select File > New Simulation... to activate the Create a New Simulation dialog.
- If you are opening an existing simulation, select File > Load Simulation... to activate the Load Simulation dialog.
By default serial mode is selected, so click the Parallel on Local Host radio button to change to parallel mode.
Enter the number of processes in the Compute Processes box. You can also increment this value using the arrows. The equivalent command line which is used to start the server is displayed in the Command text box.
Click OK to accept the settings. Now, any simulation that you open runs the server in parallel mode with the specified number of processes on the local host.

Starting from the Command Line

If your machine has 2 cores, two processes can be started using the -np option. The full command line would be:

starccm+ -np 2

In this simple case, you do not need to specify the -on option or the -machinefile option. Simcenter STAR-CCM+ presumes that you are referring to the local host when you omit these options.