Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 6 of 6 for “"instability wave"”.
-
Effect of heating on sound radiated from a two-dimensional mixing layer
The effect of heating on sound radiated by instability waves in a two-dimensional mixing layer is studied. A linear stability theory coupled with linearized Euler calculations are used to compute the amplitude of the instability wave and its associated sound field. The linear stability analysis …
-
Spinning modes in orderly jet structure and jet noise
… the form of circumferential modes of azimuthal wavenumber m=0,1 and 2. Detailed aerodynamic measurements on the initial region of the jet indicate that the m=0 and m=1 modes have comparable axial growth rates. Further, when forcing was applied in a combination of first (m = ±1) or second (m = …
-
The acoustics of curved and lined cylindrical ducts with mean flow
… to apply a Kutta-like condition or to include an instability wave, as had previously been necessary. Attention is then turned to a cylindrical duct with a curved centreline and either hard or locally-reacting walls. The centreline curvature (which is not assumed small) and wall radii vary slowly …
-
Numerical Investigation of Tonal Noise on a Transitional Airfoil under Varying Conditions
… <p>Our results indicate that the growth of instability waves in the flow-separation region is a necessary condition for the generation of tones, but the selected tonal frequencies are governed not only by vortex shedding, but also through a feed-back loop that is determined, in addition to …
-
A numerical investigation of the compressible mixing layer
… number of 0.6 it is found that three-dimensional waves are more amplified than two-dimensional waves and a simple relation is found to give the orientation of the most amplified waves. It is<br/>also shown that the linear stability theory can be used to predict the mixing layer growth rate as a …
-
Physical Control of Biological Processes in the Central Equatorial Pacific: A Data Assimilative Modeling Study
… frequency mesoscale events, such as tropical instability waves and equatorially-trapped internal gravity waves.</p> <p>The feasibility of improving simulation skill by assimilating biogeochemical observations, is also examined. The adjoint method, which minimizes model/data misfits by …