Making use of computational fluid dynamics and FLUENT finite volume
software, this study investigates the appropriate gridding pattern
of free surface flow by structured grids. Investigated gridding
space in each problem includes the determination of the shape of
grid cells, their compression and distribution pattern according to
users' preferences, which seems to be experimental rather than
scientific; however, a slight difference in gridding condition may
result in a great difference in numerical results. In this study,
an open channel is modeled with different three dimensional grids
and the results of model are compared by experimental results.
Modeling results show that modeling accuracy improves as the result
of a decrease in dimensions of grid cells to an extreme value;
therefore, decreasing the dimensions of grid cells and increasing
the number of cells lead to less accurate results. While the long
side of cross section in cell locates in horizontal direction,
using rectangular section cells represents more acceptable results
than that of other cells with different structures.
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