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Regular grid
A
regular grid
is a
tessellation
of
n
-dimensional
Euclidean space
by congruent
parallelotopes
(e.g.
bricks
). Grids of this type appear on
graph paper
and may be used in
finite element analysis
as well as
finite volume methods
and
finite difference methods
. Since the derivatives of field variables can be conveniently expressed as finite differences, structured grids mainly appear in finite difference methods.
Unstructured grids
offer more flexibility than structured grids and hence are very useful in finite element and finite volume methods.
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