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Solution u of the diffuse domain Approximation 1 with Robin boundary conditions (4.9) on the boundary of the domain Ω1. Blue and red denote small and large values of u. [a]: simulation using at least 5 grid points across the diffuse interface (949.704 DOFs), [b]. refined simulation using at least 10 grid points across the diffuse interface (6.346.674 DOFs).
