Numerical modeling of vortex merging in axisymmetric mixing layers
A computational model of the large-scale motions inside the forced axisymmetric mixing layer has been developed. The resulting vortex dynamics has been seen to be dependent on the subharmonic content of the forcing function in a manner analogous to that seen experimentally in the two-dimensional mixing layer. Thus, the behavior of the coherent structures inside the forced axisymmetric mixing layer can be predicted from knowledge of the forcing frequencies. Of course, since the modeling here does not account for either azimuthal instabilities or turbulence, these results may be applicable only in the near field, with the exact extent of this region dependent on the nature of the physical forcing.
KeywordsShear Layer Coherent Structure Merging Process Nonuniform Mesh Spatial Growth Rate
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