Abstract
In this paper, a numerical investigation is presented to study the flow structures behind an axially mounted center-body of a confined annular swirling flow. Based on the transient, axisymmetric Navier–Stokes equations, the projection method is used to solve the pressure Poisson equation to retain the equation of continuity. The velocity is then solved by using the explicit Adams–Bashforth scheme. By this numerical algorithm, second-order accuracy in both time and space discretizations can be obtained. Discussions on the computational length and computing efficiency are made. For the annular swirling flow, the characteristics of the flow structures are dependent on two dimensionless parameters, the Reynolds number Re, and the swirl number S. Several flow patterns can be obtained by this numerical simulation. The lengths of the recirculation zone in various flow conditions are also calculated. It is found that the higher the swirl number, the more complex and unstable the flow. The present computational results are in reasonable agreement with those of the experiment obtained by LDA measurements and smoke visualization. Copyright © 1999 John Wiley & Sons, Ltd.
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