Table 1.

Model Generation

Method	Strengths	Limitations	Software
Surface render	Lower computational cost	Internal features not rendered	avizo, geomagic, mimics, parasolid, polydata, scanip
Fast refinement
Volume render	Internal features rendered	High computational cost	amira, avizo, polydata
Intuitive implementation
Meshing element shape
Method	Strengths	Limitations	Software
Hexahedral	Easy and intuitive to implement	Not useful for complex models	ANSYS
	Offers higher equation accuracy	No near-wall grid refinement
	Structured and unstructured methods	High computational cost
Fewer equations solved
Tetrahedral	Fully resolves complex geometries	Difficult to implement	ANSYS, gridex, meshsim, tetgen
	Allows for easier grid refinement	Problem specific
		Introduces equation stiffness
		Unstructured methods only
More equations solved