Abstract
Questions of numerical simulation of acoustic oscillations generation modes in the liquid flow around the groups of two and three circular cylinders are considered. In mining industry the processes of hydrodynamic impact on gas-saturated porous media produce significant acoustic emission both at the injection stage and at the liquid discharge stage. Simulation of such kind of acoustic processes is one of the actual problems of theoretical and applied fluid mechanics and under certain assumptions could be reduced to the flow around a group of bodies. Two approaches for numerical simulation of the acoustic oscillations generation induced by the flow around circular cylinders based on numerical solution of the Navier-Stokes equations for compressible and incompressible flows closed by differential model of turbulence and complemented by acoustic analogy equations have been developed. For laminar flows, eight different modes that fundamentally differ both in the flow structure and in the frequency spectrum of parameter oscillations have been identified. For turbulent flows, the classification criteria for the three main frequency modes are presented. Acoustic data are obtained using the Direct Noise Computation technology and acoustic analogies as well.
Highlights
Many technical problems require deep study of acoustic processes induced by flows around a group of objects, like flows around power lines, urban high-rise buildings [1, 2] on macro level and bubble- or particle-saturated flows in small cavities on micro level
The exposure process is accompanied by active acoustic emission both at the injection stage and at the liquid discharge stage
Simulation of acoustic emission in such kind of processes is one of the actual problems of theoretical and applied fluid mechanics and under certain assumptions could be reduced to flow around a group of bodies
Summary
Many technical problems require deep study of acoustic processes induced by flows around a group of objects, like flows around power lines, urban high-rise buildings [1, 2] on macro level and bubble- or particle-saturated flows in small cavities on micro level. In mining industry there is lot of methods for processing the outburst hazardous coalbeds with the liquids [3], such as hydrodynamic impact on gas-saturated porous media [4, 5]. The exposure process is accompanied by active acoustic emission both at the injection stage and at the liquid discharge stage. Simulation of acoustic emission in such kind of processes is one of the actual problems of theoretical and applied fluid mechanics and under certain assumptions could be reduced to flow around a group of bodies.
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