We can not run simulations in installation directory. It is required to copy test cases somewhere else and keep all files organized. You can also copy test cases on your desktop. But that will make your desktop filled. So it is better to keep all OpenFOAM files in $FOAM_RUN directory.

During entire series we will keep all tutorial files in $FOAM_RUN directory.

$FOAM_RUN directory will be created outside your installation folder so it will not come with installation itself, we need to create it manually.

Thanks,

Divyesh