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In this study,develop a numerical model,the first uses Body-
fitted coordinate system，to transform the coordinate system
of the flow field, irregular boundary geometric shape of
physical space into regular bound- ary geometric shape of
compuational space , Secondly,multigrid method combining
with automatic adaptive mesh refinement technique , then is
applied to the Two-dimension irregular boundary flow.
The Governing equation uses Wave equation，the governing
equation have been coordinates system transform mapping，then
applied to the coo- rdinates of compuational space.Our
approximation is based on the use of finite differences at
each grid level.Multigrid approach requires a data structure
that is simple enough to implement efficiently, yet flexible
enouth to permit the very complicated patterns of local mesh
refinement that would be generated by and adaptive mesh
refinement strategy. The adaptive mesh refinement criterion
is based on estimates of the first order derivative error.
The models have been verified analytical solution of flow field
， then is applied to the Two-dimension irregular boundary
flow，in order to obtain the simultae product.
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