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. 2021 Oct 13;10(4):1619–1650. doi: 10.1007/s40072-021-00214-w

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — Cost of methods in total number of degrees of freedom (vertical axis) versus maximum level L (horizontal axis), when using the number of quadrature points (27) (left) and (28) (right) with $N_{1} = 10$ . shows the cost of the quadrature, the cost of the FEM-BEM discretisation, the resulting cost of the single-level and of the multilevel methods

graphic file with name 40072_2021_214_Figa_HTML.jpg — Cost of methods in total number of degrees of freedom (vertical axis) versus maximum level L (horizontal axis), when using the number of quadrature points (27) (left) and (28) (right) with $N_{1} = 10$ . shows the cost of the quadrature, the cost of the FEM-BEM discretisation, the resulting cost of the single-level and of the multilevel methods