This article shows the effect of FEA mesh element distortion on the analysis results, and how to control element size so the transition from the coarse to fine mesh doe not cause element distortion.
Mesh Size - an overview
Mesh Refinement - an overview
Basic Finite Element Mesh Explained
How to change mesh size using body sizing?
Element Size In FEA - Does It Matter?
Mesh generation - Wikipedia
MIDASoft - Bridge Library
Accelerate Your Workflow with Ansys Meshing
Basic Finite Element Mesh Explained
MIDASoft - Bridge Library