Features of the near-wake topology of aerosol particles behind simple-shaped bodies

Features of the near-wake topology of aerosol particles behind simple-shaped bodies

Chernova A.A. (ISTU, Izhevsk, Russia)

Abstract

The process of unsteady subsonic laminar flow around bodies of simple shape by a two-phase flow of air suspension (the volume fraction of water in the air suspension is 1%) is investigated. The problem can be described by a system of Navier-Stokes equations with the addition of both the concentration equations and the equations of state corresponding to the phases of the air suspension, as well as terms that take into account the interphase interaction of liquid particles with the satellite air flow and a streamlined body. The solution is based on the Euler approach based on the multiphaseEulerFoam library of the OpenFOAM package. The fields of distribution of physical quantities (pressure, velocity, concentration) at fixed time points are presented and analyzed. As a result of the study, it was revealed and shown that the structure of the air suspension flow near the streamlined body (before and after) is characterized by the formation of an area of flow deceleration near the body, areas of local changes in flow parameters along the lateral boundary of the streamlined body and the formation of an area of low pressure and vortex formation behind the body. The features of the formation and development (including topological features) of currents in the near wake are identified and shown. It is shown that the shape of the body has a significant effect on the physical parameters of the flow near the streamlined body, pressure differences in the braking area and in the discharge area of the flow behind the streamlined body, as well as the lengths of the braking area and the near track are estimated. It is noted that the vortex wake of the body is mainly filled with the air phase of the air suspension. It is shown that the presence of water particles leads to an expansion of the boundaries of vortex flows behind the body, including a slight increase in the amplitude of pulsations of vortex structures. An assessment of the effect of gravity on the flow of air suspension near a streamlined body and in the near wake showed the need to take it into account.

Keywords

numerical modeling; aerohydrodynamics; aerosol; flow around simple-shaped bodies; near wake.

Edition

Proceedings of the Institute for System Programming, vol. 38, issue 3, part 1, 2026, pp. 223-240

ISSN 2220-6426 (Online), ISSN 2079-8156 (Print).

DOI: 10.15514/ISPRAS-2026-38(3)-14

For citation

Chernova A.A. Features of the near-wake topology of aerosol particles behind simple-shaped bodies. Proceedings of the Institute for System Programming, vol. 38, issue 3, part 1, 2026, pp. 223-240 DOI: 10.15514/ISPRAS-2026-38(3)-14.

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