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Table 1

Numerical values of the main parameter considered in each of the simulation methods, as well as the secondary parameters.

Method Main parameter Limit values Additional parameters Time/freq
MS Repetitions of the unit cell 1–64 Reflection order = 3 NFT = 6
Number of terms in the Bessel functions = 5
FEM Mesh quality
  • Min. number of elements per wavelength* = ¼ to 4

  • Max. number of elements per wavelength* = 2–2000

  • Growth factor = 1.8–1.1

  • Curvature factor 0.8–0.2

  • Element order.

  • Triangles, i.e. 3 nodes

NFT = 6
FDTD Number of grid points per wavelength 1–50 Courant–Friedrichs–Lewy number = 1 Total time of flight/time of flight of the 4 cells = 20;
BEM Number of boundary elements per wavelength 1–100
  • Element order.

  • Constant elements, with 1 central node.

NFT = 6
MFS Number of virtual sources and collocation points per wavelength 1–100 Distance form virtual source to boundary: 40% of the radius of the scatterer NFT = 6

Elements or cell points per wavelength refers to the smallest wavelength evaluated ( Hz).

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