The Technique of MIEELDLD in Computational Aeroacoustics

Table 2

Comparing the dispersive and group velocity properties for two spatial methods LOCKARD and LOCKARD-NEW in terms of number of points per wavelength (to 4 d.p).

Accuracy	Method	Max. value of 𝜃ℎ	No. of pts per wavelength
|𝜃^∗ℎ−𝜃ℎ|𝜋≤5×10^−3	LOCKARD	1.4910	4.2140
|𝜃^∗ℎ−𝜃ℎ|𝜋≤5×10^−3	LOCKARD-NEW	1.5197	4.1344
|𝜃^∗ℎ−𝜃ℎ|𝜋≤5×10^−4	LOCKARD	1.2204	5.1485
|𝜃^∗ℎ−𝜃ℎ|𝜋≤5×10^−4	LOCKARD-NEW	1.2596	4.9881
||||𝑑𝑑(𝜃ℎ)(𝜃^∗ℎ)−1.0||||≤5×10^−3	LOCKARD	1.0964	5.7309
||||𝑑𝑑(𝜃ℎ)(𝜃^∗ℎ)−1.0||||≤5×10^−3	LOCKARD-NEW	1.1395	5.5142
||||𝑑𝑑(𝜃ℎ)(𝜃^∗ℎ)−1.0||||≤5×10^−4	LOCKARD	0.9655	6.5077
||||𝑑𝑑(𝜃ℎ)(𝜃^∗ℎ)−1.0||||≤5×10^−4	LOCKARD-NEW	1.0240	6.1359