Figure 5

Identification of fluid cell, solid cell, and boundary cell based on the \(\phi\) signs at four vertexes of each cell. All negative \(\phi\)s mean a fluid cell (green, \(\mathcal{P}=0\)), all positive \(\phi\)s means a solid cell (blue, \(\mathcal{P}=1\)), and partial negative (vertexes c and d) partial positive (vertexes a and b) indicates a boundary cell (red,\(0< \mathcal{P}<1\)).