Numerical Investigation of an Unsteady Blade Surface Blowing Method to Reduce Rotor Blade-Vortex Interaction Noise

Table 2

Comparison of the computational cost, thrust coefficient of three grid resolutions.

Blowing case	Grid case	CPUh/rev	Thrust coefficient
Nonblowing	Benchmark Grid	640.0	0.00539
	Finer Grid	1304.1	0.00541
	Coarser Grid	374.4	0.00538
Steady blowing	Benchmark Grid	654.1	0.00505
	Finer Grid	1359.7	0.00506
	Coarser Grid	411.5	0.00505
Unsteady blowing	Benchmark Grid	648.2	0.00521
	Finer Grid	1368.0	0.00522
	Coarser Grid	392.5	0.00520

Notes: Benchmark Grid (background grid points: ), Finer Grid (background grid points: ), and Coarser Grid (background grid points: ). The same blade grid of points used in the three cases.