Effect of External Forcing on the Self-Similarity of Turbulent Jets

Moeini, Masoud and Khorsandi, Babak (2017) Effect of External Forcing on the Self-Similarity of Turbulent Jets. In: 16th Iranian Hydraulic Conference, Spetember 2017.

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Abstract

The perturbation of self-similarity assumption in turbulent jets in the presence of external forcing is investigated. External forcing introduces new parameters to the dynamical description of the flow which are in addition to those present in a pure jet. In contrast to the very advantageous and plausible similarity assumption made for jets released into quiescent ambient flows (pure jet), we will argue based on experimental results that the premise of complete self-similarity is not tenable for jets exposed to the external forcing. This would restrict the applicability of most pollution dispersion models which have been developed based on the self-similarity assumption. Consequently, it is suggested that the results obtained by such integral models may not be fully representative of various engineering applications, and therefore caution must be urged.

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