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1.1.2 Starting FLUENT on a Linux/UNIX System

There are several ways to start FLUENT on a Linux/UNIX system:

Specifying the Solver Version from the Command Line

When you start FLUENT from the command line, you can specify the dimensionality of the problem (2D or 3D), as well as whether you want a single-precision or double-precision calculation:

fluent 2d

runs the two-dimensional, single-precision solver,

fluent 3d

runs the three-dimensional, single-precision solver,

fluent 2ddp

runs the two-dimensional, double-precision solver, and

fluent 3ddp

runs the three-dimensional, double-precision solver.

See Section  31.3 for information about starting the parallel solvers.

Launching the 32-Bit Version of FLUENT from the Command Line

On operating systems that contain both 32-bit and 64-bit ports (including IRIX, Solaris, AIX, and HP-UX (PA-RISC)), typing fluent on the command line will start the 64-bit version of FLUENT by default. To launch the 32-bit version of FLUENT, type the following on the command line:

fluent -32

The option of launching the 32-bit version is useful when running small cases that do not require a lot of memory.

Specifying the Solver Version in the Select Solver Panel

If you type fluent on the command line with no arguments, the startup console window (the text window and the main menu bar) will appear as shown in Figure  1.1.1.

Figure 1.1.1: Console Window at Startup

You can start a single-precision version of FLUENT by typing 2d or 3d at the version> prompt. For a double-precision version, type 2ddp or 3ddp.

If you would rather use the GUI to start the correct version, select the Run... menu item in the File menu.

File $\rightarrow$ Run...

The Select Solver panel will appear as shown in Figure  1.1.2, and you can pick the appropriate version. (You can also start FLUENT on a remote machine or start the parallel version from this panel, as described in Sections  1.2 and 31.3.)

Figure 1.1.2: The FLUENT Version Is Selected Using the Select Solver Panel

You will normally follow the steps below to start a solver from the panel:

1.   Specify a 2D or 3D solver by turning the 3D option on or off under Versions.

2.   Specify the precision by turning the Double Precision option on or off under Versions.

3.   Click the Run button.

If the program executable is not in your search path, you can specify a complete pathname to the executable in the Program text entry box before clicking Run.

Specifying the Solver Version by Reading a Case File

As discussed above, if you type fluent on the command line without specifying a version argument, the console window will appear as shown in Figure  1.1.1. You can then automatically execute the appropriate solver by selecting a case file or case and data files using the File/Read/Case... or File/Read/Case & Data... menu item (see Section  4.3) or using the read-case or read-case-data command in the version text menu.

File $\rightarrow$ Read $\rightarrow$ Case...

File/Read/Case... or read-case starts the solver that is appropriate for the specified case file and then reads in the file.

File $\rightarrow$ Read $\rightarrow$ Case & Data...

File/Read/Case & Data... or read-case-data starts the solver that is appropriate for the specified case file and then reads in the specified case and data files (where the case and data files have the same name with .cas and .dat extensions, respectively).

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