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Introduction to Computational Fluid Dynamics (CFD) - page 24 / 47

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Numerical methods (grid generation)

Grids can either be structured (hexahedral) or unstructured (tetrahedral).  Depends upon type of discretization scheme and application

Scheme

Finite differences:  structured

Finite volume or finite element:  structured or unstructured

Application

Thin boundary layers best resolved with highly-stretched structured grids

Unstructured grids useful for complex geometries

Unstructured grids permit automatic adaptive refinement based on the pressure gradient, or regions interested (FLUENT)

structured

unstructured

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