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228 Chapter 11 Incompressible Flow Analysis

be analyzed firstly by using a two-dimensional domain. This can
reduce the number of unknowns and provide adequate information
of the flow behavior. The two-dimensional model is shown in the
figure.

We apply the boundary conditions of water inlet
velocity at 1 m/s as shown by symbol A in the figure. The water
exits from the piping system at the atmospheric pressure denoted
by symbol B.

With the flow domain, the mesh can be constructed
easily. By assigning the cell size of approximately 10 mm, the
mesh consists of 3,419 cells as shown in the figure.