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Recently, a new definition, called rortex, has been proposed to quantify the purely rotational motion of fluids. In this work, based on the DNS data we employed the rortex to assess and visualize the rotational motion and structure of vortex in swirling jets in comparison with other kinds of vortex criteria of Q, λ2, vorticity and Omega. The rortex vector, Omega, Q, and λ2 criteria are found to be...
The characteristics of the acceleration a and its correlation with the vortex core in the swirling flow are analyzed in this paper. The swirling flows of four swirl numbers (Sn = n S 0, 0.10, 0.20 and 0.36) are simulated by the direct numerical simulation, and the fluid mass particles from the inlet of the swirling flow are traced as a database for the current study. The correlations of the acceleration...
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