Download the model
There are some models in the opm-upscaling module that are used for testing purposes. We will use one of those models as an example.
The simplest way to obtain it is to download it from Github:
wget https://raw.githubusercontent.com/OPM/opm-upscaling/master/tests/input_data/grids/Hummocky.grdecl
The file is 603 KB, and contains a corner-point grid model with porosity and permeability. You can use ResInsight to inspect the model and its properties.
ParaView can also be used to view the model, but that requires first creating a VTU file for ParaView, this can be done using the grdecl2vtu program, if you want to do this perform the steps below:
sudo apt-get install libdune-cornerpoint1-bin grdecl2vtu Hummocky.grdecl