Abstract
An attempt is made to identify the underlying mechanisms for the deformation of coherent structures that occurs in the initial state of axis switching of elliptic-core jets. The generalized shooting method is applied to jets with elliptic-core regions of constant flow. The analysis shows that there are three conditions on groups of eigenmodes of elliptic-core jets which are necessary for the deformation. They are (1) proper localizations without excessive overlapping; (2) sufficiently large phase-speed differences; and (3) comparable spatial amplification rates. The qualitative behaviors of elliptic-core jets in relation to these three conditions are studied with respect to independent and joint variations of core eccentricity, azimuthal distribution of momentum thickness, and compressibility.
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