P-FFT Accelerated EFIE with a Novel Diagonal Perturbed ILUT Preconditioner for Electromagnetic Scattering by Conducting Objects in Half Space

Table 3

Comparison of different integral operators and preconditioners for 3D scattering.

	Unknowns	(ILUT)	EFIE-DP-ILUT		EFIE-ILUT		EFIE-ILUTP5		CFIE
				(sec)		(sec)		(sec)		(sec)
Almond	43,743	200	53	2,034	800+	5000+	742	5,028	49	2,239
Open cavity	120,105	55	84	12,126	180	13,859	80	11,926	—	—
Aircraft model	69,534	100	276	8,752	800+	37,000+	800+	37,000+	134	8,372
Tank model	701,262	80	351	60,392	800+	130,000+	773	121,857	123	74,562