On the Finite Element Tearing and Interconnecting Method for Scattering by Large 3D Inhomogeneous Targets

Table 1

Iteration number versus the number of subdomains.

𝑀, 𝑁, 𝐿	Number of subdomains	FETI-DPEM1		FETI-DPEM2
		Dual unknowns	Iteration number	Dual unknowns	Iteration number
3,3,3	27	2160	37	4320	40
5,5,5	125	12000	359	24000	69
10,10,10	1000	108000	>500	21600	127