FIG. 4.
(Color online) Evolution of the concentration u on the isocontours of ϕ from ϕ = 0.4 to ϕ = 0.6 is shown at times t = 0 (a), t = 0.0005 (b), t = 0.001 (c), and t = 0.02 (d); H0(−1) = 2, H0(1) = 5, bN(−1) = bN(1) = 1.
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