How can I refine the model in unstructure grid?

Hi Paraview community members,

Here is a picture of the model I imported through an unstructured grid file shared in this dropbox link.

As you can see that, the model looks very rough due to not enough particles.

I was wondering if there is a way, to generate more particles based on these current particles in Paraview to make this model look finer? Thank you!

All the best,