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Linux Terminal Basics
zCFD, like most other CFD solvers such as OpenFOAM and SU2 is written to run on a linux based operating system. There are many reasons why this is beneficial including easier guaranteed compatibility across systems, easier access for optimising the use of available hardware, and the fact almost all HPC clusters run a unix operating system. Simply put for scientific computing, it is the standard.
That does not mean so solver cannot run on windows, the introduction of Windows Subsystem for Linux (WSL) means that the solver is capable of running on windows based machines and can even leverage NVIDIA GPU hardware to accelerate solver performance.
zCFD runs from the linux terminal (or command line), meaning having a good understanding of how the command line works will help you on your way to getting your first jobs run and submitted.
Depending on the linux system being used, the terminal will either be your main way of interacting with the computer (such as on a cluster or WSL), or it can be launched from the launch menu if using a GUI such as Ubuntu or CentOS (NiceDCV).