The Flow Noise Simulator (FNS) is a new large and quiet cavitation tunnel constructed by Naval Ship Systems Research Center of TRDI/Ministry of Defense, Japan for naval hydrodynamic and hydroacoustic research. This paper describes several results obtained from the initial evaluation tests of the facility involving, 1) flow uniformity and turbulent intensity at the test section, 2) LDV (Laser Doppler Velocimetry, 3) High Reynolds number turbulent boundary layer on the test section wall, 4) Acoustic noise source detection capability of the hydrophone array.