Increasing mesh sizing size

Sorry, if you got the impression that it was about comparing with literature. That was not my goal.
I only found that the higher Mesh resolution (only using smaller mesh cells) I use, the stranger (the more diverse) the results become (while keeping all other things the same).

But thanks for acknowleging that the higher the mesh resolution (smaller cells); the better results should be. Need to determine what I do wrong then (unfortunately I have no advisor), as the present results of mine make no sense.

Thanks

All the best,

Victor