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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.
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.

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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.
- 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

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.

The double precision version of Simcenter STAR-CCM+ is generally intended for cases that involve physical phenomena of vastly differing scales. Examples include: sound wave propagation in water, three-dimensional microstructure battery modeling, electrodynamics simulations, and multiphase flows.

The advantage of running these simulations in double precision is increased accuracy due to less round-off error. This increase in accuracy leads to robust convergences of problems that would otherwise not converge to an adequate result in single precision.

When running simulations with double precision:

The memory requirements are 20% greater than with mixed precision.
The overall simulation time increases by 15-20%.
The size of .sim files increases by not more than 100% (depending on the proportion of floating point fields for the case).

Refer to the release notes for a list of the platforms for which a double precision version is available.

To run simulations with double precision, install a double precision version of Simcenter STAR-CCM+. The interface and workflow for both versions are identical.

Precision

The term precision refers to the size of (and hence, number of digits of precision that are stored for) floating point data. A single precision float occupies 4 bytes of memory and has 7 digits of precision. A double precision float occupies 8 bytes of memory and has 15 digits of precision.

Double Precision Variables

In the mixed precision version of Simcenter STAR-CCM+, the fields of double precision floating point data include:

Coordinates (that is, vertices locations in space)
Pressure
Displacements (for example, solid-stress displacements).

In the double precision version of Simcenter STAR-CCM+, all fields of floating point data are double precision.

Fields of other types (for example, integers and booleans) are the same in either version.