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. 2021 Feb 26;16(2):e0247641. doi: 10.1371/journal.pone.0247641

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© 2021 Lu et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 8 — (a)Mesh refinement test. The stars show the numerical error. The fitted lines show a convergence order of 1.73 for the 2D case and 1.71 for the 3D case with respect to mesh size. The relative error is computed by the normalized L²-norm of P_O. (b) The decay of the relative difference between two iteration steps. The relative difference is computed by the normalized L²-norm of q. (c) Iteration numbers for different mesh size.