Abstract
Abstract In the numerical analysis of flows, we need to treat various types of boundary conditions; in particular, in the fields of oceanophysics or hydraulics, “free surface”, “density interface” and “open boundary” have been considered difficult to treat. On the basis of a deformable-cell method, the cells dividing the fluid can be deformed in accordance with the moving boundaries, as in the arbitrary-Lagrangian-Eulerian method, and these boundary conditions are systematically treated with a “generalized boundary equation”. The validity of this method is shown by a flow with a free surface, a density interface and an open boundary.
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