Fig. 4. Construction of donating regions. (a) Streakline of a cell's vertex P0 represented by the 2-segment polygonal line P0–P1/2–P1. (b) Triangulated streaksurface of a cell's edge P0Q0. (c) Streaktube of a cell's face P0Q0R0S0. (d) Pyramidal volume flux correction ⁎ capping the donating region of the face P0Q0R0S0.

Fig. 4. Construction of donating regions. (a) Streakline of a cell’s vertex P0 represented by the 2-segment polygonal line P0–P1/2–P1. (b) Triangulated streaksurface of a cell’s edge P0Q0. (c) Streaktube of a cell’s face P0Q0R0S0. (d) Pyramidal volume flux correction

capping the donating region of the face P0Q0R0S0.