Computation of Aerodynamic Noise Radiated from Ducted Tail Rotor Using Boundary Element Method

Table 2

Mean and maximum values of the induced downwash, velocity, and attack angle for different grid densities.

Meshing parameters		⁢Induced downwash		Circumferential induced velocity		Induced attack angle
Grid cells	(mm)
48 k	1.335	1.028	3.374	0.799	1.376	0.542	0.835
96 k	0.861	0.914	3.021	0.723	1.224	0.407	0.801
258 k	0.742	0.857	2.853	0.583	1.011	0.380	0.788
480 k	0.604	0.777	2.634	0.371	0.969	0.236	0.728
712 k	0.359	0.513	2.028	0.126	0.808	0.105	0.519
837 k	0.147	0.434	1.634	0.101	0.761	0.095	0.353
968 k	0.082	0.125	1.008	0.098	0.486	0.088	0.104