The effects of sound pressure level at two observation positions a fixed and varied blade pitch angle Low-Mach unsteady incompressible Reynolds-Average Navier-Stokes flow approach, on an H-rotor Vertical Axis Wind Turbine. objective the study is to compare noise dissipation output power/energy airfoil blades design vertical axis wind turbine in residential zones. Ffowcs Williams-Hawkings (FHWH)...