Oscillations

Hi All, I had a quick question,

I'm seeing oscillations emerge in my model (a 1D mass flow situation), and I was wondering: is it possible for these oscillations to emerge due to the solver (too coarse a mesh or timestep?)?

I've tried a couple meshes down to what is reasonable, and a few timesteps, so I suspect it is a result of my model itself but I wanted to check with the community just to know, if only for my own erudition, if the solver itself can induce spatial or temporal oscillations.

Thank you,