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12. Special Topics
present of a method that eliminates the problem for unstructured arbitrary
grids in 3D.
An example of the capabilities of interface-capturing methods is shown
in Fig. 12.5, which illustrates the solution to the 'dam-break' problem, a
standard test case for methods for computing free-surface flows. The barrier
holding back the fluid is suddenly removed, leaving a free vertical water face.
As water moves to the right along the floor, it hits an obstacle, flows over it
and hits the opposite wall. The confined air escapes upwards as water falls to
the floor on the other side of obstacle. Numerical results compare well with
experiments by Koshizuka et al. (1995). The method has also been applied t o
vigorous sloshing in tanks, slamming of bodies onto liquid surface, and flow
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around ships and submerged bodies.
Fig. 12.5. Comparison of experimental visualization (left) and numerical prediction
(right) of collapsing water column flow over an obstacle (experiments by Koshizuka
et al., 1995; prediction by Muzaferija and PeriC, 1999)