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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.
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.
Saving Simulations to File
A simulation file contains the complete set of simulation objects, state, and data for the problem.
Saving Over an Existing Simulation File
Once you have changed a simulation, you can save it to a simulation file.

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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.
  - Launching Simcenter STAR-CCM+
    Launching Simcenter STAR-CCM+ is generally a two-step process. For an interactive session, you first launch the client, and then you launch a server process from the client. You can also launch servers directly and connect to them later.
  - Interactive Startup Reference
    Simcenter STAR-CCM+ presents you with a dialog containing startup options when you create a simulation or load an existing simulation. These options control how Simcenter STAR-CCM+ launches the server. Some options are specific to the Load Simulation dialog.
  - Creating and Opening Simulations from the Command Line in Serial Mode
    Using the starccm+ command on its own, without any other options, launches the Simcenter STAR-CCM+ client workspace.
  - Starting Remote Servers from the Command Line
    The functionality for starting a remote Simcenter STAR-CCM+ server involves a simple command, around which you add options depending on what needs specified.
  - Restrictions on Names of Files and Paths in Simcenter STAR-CCM+
    The characters in the following table have restrictions on their use in the names of files or paths in Simcenter STAR-CCM+.
  - CPU Binding
    CPU binding constrains a simulation to run only on a particular set of CPUs or cores, and not to migrate to others during the life of the simulation.
  - Using the Simulation Pop-Up Menu
  - Saving Simulations to File
    A simulation file contains the complete set of simulation objects, state, and data for the problem.
    - Saving Over an Existing Simulation File
      Once you have changed a simulation, you can save it to a simulation file.
    - Saving a Copy of a Simulation
      The File > Save As menu option allows you to save the simulation into a new simulation file.
    - Saving Multiple Simulations
      Once you have changed one or more open simulation files, you can save changes to them with a single action.
    - Renaming the Simulation
      A simulation file can be renamed using the inline editor, except within the Simcenter STAR-CCM+ client this technique works for simulation files only through slow clicking, and only within the Open dialog.
    - Using Backup Files
      Simcenter STAR-CCM+ generates a set of files that can come in handy as backups of your work.
    - What Happens If a Disk Is Full?
      If the disk becomes full while you save a simulation file, Simcenter STAR-CCM+ notifies you that the file could not be saved due to insufficient disk space.
  - Reverting Unsaved Changes to the Simulation
    Use the Reload Simulation feature to return to the latest saved version of your simulation file.
  - Closing the Simulation
    When you are done with a simulation, you can close it to free up the machine resources it has been using.
  - Closing the Client Workspace
    When you are done with simulations, close the client workspace to regain resources that it was using:
  - Viewing and Editing the Log File
    This section defines what is meant by a log file, and describes how to view a log file and add comments to one.
- Working With Parallel Servers
  A parallel computation is one where the work is computed by more than one process.
- 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

Saving Over an Existing Simulation File

Once you have changed a simulation, you can save it to a simulation file.

This action writes changes to the simulation file on the hard drive where the simulation resides. If the simulation being saved is new (has not been saved yet), then the save as action is executed. This action is only available when a simulation tree is active.

There are a number of ways to save a file:

Selecting the File > Save menu option
Clicking the Save toolbar icon
Using the <Ctrl><S> keyboard shortcut

These methods are only available if you have changed the simulation since it was opened. If no changes were made, the menu option and the toolbar are grayed and the keyboard shortcut has no effect.