Turbulent jet flow noise prediction.

Abstract: The text of the abstract follows. In this paper we describe a numerical approach to completely determine the structure of a low Reynolds number compressible jet ow and to compute the associated sound waves in the far eld. The method is applied to simulate a Reynolds number 4; 000, Mach number 0:8 jet, with the results validated by comparison with the jet reproduced experimentally. The mean ow and far eld sound results are shown to while matching conditions are created experimentally inside a low pressure tank. The mean ow results of the DNS are seen to correspond well with our experimental results, and to be compatible with those published in the literature. The semi-analytically obtained sound eld is shown to be identical to that obtained purely by the DNS in the near eld, while in the far eld matches those obtained by us experimentally, and compatible with experimental results previously published.