Fig. 5
From: A novel high accuracy finite-difference time-domain method
Dependence of the phase velocity errors on wavenumber in three dimensions: a Sekido23 with \(C=0.4\) in the \(k_x\)-\(k_y\) plane; b Sekido23 with \(C=0.4\) in the \(k_r\)-\(k_z\) plane; c scheme 1 with \(C=0.4\) in the \(k_x\)-\(k_y\) plane; d scheme 1 with \(C=0.4\) in the \(k_r\)-\(k_z\) plane; e scheme 2 with \(C=0.4\) in the \(k_x\)-\(k_y\) plane; f scheme 2 with \(C=0.4\) in the \(k_r\)-\(k_z\) plane; g Sekido23 with \(C=1\) in the \(k_x\)-\(k_y\) plane; h Sekido23 with \(C=1\) in the \(k_r\)-\(k_z\) plane; i scheme 1 with \(C=1\) in the \(k_x\)-\(k_y\) plane; j scheme 1 with \(C=1\) in the \(k_r\)-\(k_z\) plane; k scheme 2 with \(C=1\) in the \(k_x\)-\(k_y\) plane; l scheme 2 with \(C=1\) in the \(k_r\)-\(k_z\) plane