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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Print: 2152-5102
ISSN Online: 2152-5110

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v27.i2-4.160
pages 419-432

Outflow Boundary Conditions for the Computational Analysis of Jet Noise

James N. Scott
Department of Aeronautical & Aeronautical Engineering, The Ohio State University, Columbus, Ohio, U.S.A. and ICOMP, NASA Lewis Research Center, Cleveland, Ohio
R. R. Mankbadi
NASA Lewis Research Center, Cleveland, Ohio, U.S.A.
M. E. Hayder
ICOMP, NASA Lewis Research Center, Cleveland, Ohio, U.S.A.
S. I. Hariharan
Department of Mathematical Sciences, The University of Akron, Akron, Ohio, U.S.A.; and ICOMP, NASA Lewis Research Center, Cleveland, Ohio, U.S.A.

ABSTRACT

Prediction of far field noise radiation from high speed jets depends upon the accurate computation of the unsteady jet flow features and preserving the wave-like character of such features. It is particularly critical that these features be preserved as the disturbances pass through the computational boundaries. The present effort is directed toward examining various formulations based on the method of characteristics for outflow boundaries. Small harmonic disturbances are introduced at the inflow and the computed results for the growth of the input disturbance are compared against that of linear stability theory using three different outflow boundary conditions in a Navier-Stokes code. Another issue of importance examined in this study is the influence of proximity of the outflow boundary (or length of the computational domain) relative to the jet diameter.


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