Abstract
In many industrial applications, a permeable mesh (porous screen) is used to control the unsteady (most commonly vortex) flows. Vortex flows are known to display intriguing behavior while propagating through porous screens. This numerical study aims to investigate the effects of physical properties such as porosity, Reynolds number, inlet flow dimension, and distance to the screen on the flow behavior. The simulation model includes a piston-cylinder vortex ring generator and a permeable mesh constructed by evenly arranged rods. Two methods of user-defined function and moving mesh have been applied to model the vortex ring generation. The results show the formation, evolution, and characteristics of the vortical rings under various conditions. The results for vorticity contours and the kinetic energy dissipation indicate that the physical properties alter the flow behavior in various ways while propagating through the porous screens. The numerical model, cross-validated with the experimental results, provides a better understanding of the fluid–solid interactions of vortex flows and porous screens.
Highlights
A permeable mesh screen in the form of parallel rods, honeycombs, or perforated plates may be used to control flow by changing the direction or scale and intensity of velocity
Left images present vortex rings produced by the dynamic mesh modeling, while the right images are produced by the user-defined functions (UDFs) method
In this paper we have presented the numerical analysis of vortex flow propagating through the porous screen
Summary
A permeable mesh screen in the form of parallel rods, honeycombs, or perforated plates may be used to control flow by changing the direction or scale and intensity of velocity. Vortex flow is inherently nonlinear and is known to display intriguing behavior while interacting with porous objects. The dynamic interactions of fluids with porous media remains an important area of investigation that can yield critical and much-needed improvements, and benefit a wide set of applications. The study of vortex flows, their dynamics, and various properties are an active and ongoing area of research. Some previous studies [1,2,3,4,5,6,7,8,9] conducted experiments to understand the vortex flow interaction with non-porous (flat plate) solid structures. With the complicated morphology of porous media, when two subjects of porous media and a vortex ring come together, an even richer set of conditions emerges and displays interesting behavior. The two subjects of vortex flows and porous media have been individually investigated, limited studies exist for the propagation of vortex flows through porous media
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