Investigation on flow around and through a hygroscopic porous cylinder with consideration of compressibility of moist air

Junjun Sun,Qingyong Zhu

doi:10.1063/5.0063012

Abstract

In order to better understand the influence of the physical conditions, such as high temperature, high humidity, and high speed, on porous media in coastal engineering, a compressible, viscous, unsteady flow around and through a hygroscopic porous circular cylinder was discussed in this paper. The effects of the hygroscopicity, the Mach number, and the Darcy number on the flow structure, temperature field, and water content of the porous cylinder are evaluated in detail. The results of numerical simulations show significant effects of compressibility of moist air on the lift and drag of the cylinder. With an increase in the Mach number, the frequency of vortex shedding argument and dimensionless lift and drag of the porous cylindrical surface decrease. Nevertheless, the effect of the Mach number on the magnitude of the vorticity and distribution of temperature is negligible. In our simulation, we also found that an increase in the Darcy number significantly weakens the magnitude of the vorticity and the amplitude of lift and drag of the cylinder. Moreover, the absorption of the porous cylinder may also have a weak effect on accelerating vortex shedding. Considering the high temperature, high humidity, and high speed of the coastal environment, this paper has some significance for the study of wind erosion.

Highlights

Porous media widely exist in the natural world, production, and daily lives, such as plant tissues, clothes, and soft rock
A large number of studies have paid attention to the interaction between water and soft rock, as moisture often causes the mechanical properties of soft rock reduction, such as salt crystallization, chemical and biological attack, and wind erosion, when water permeates into the rock
This paper focus on the moist air flow around and through a red sandstone cylinder, which is mainly affected by three effective factors, i.e., the Darcy number (Da), Mach number (Ma), and Reynolds number (Re)

Summary

Introduction

Porous media widely exist in the natural world, production, and daily lives, such as plant tissues, clothes, and soft rock. Soft rock is one of the porous media that is frequently encountered in engineering projects, especially in coastal engineering and underground engineering.. Water is the main factor that affects the long-term performance of porous media materials. The penetration of water will cause the deterioration of material properties. Water is the main carrier of corrosive materials into the medium.. A large number of studies have paid attention to the interaction between water and soft rock, as moisture often causes the mechanical properties of soft rock reduction, such as salt crystallization, chemical and biological attack, and wind erosion, when water permeates into the rock. Water is the main carrier of corrosive materials into the medium. Recently, a large number of studies have paid attention to the interaction between water and soft rock, as moisture often causes the mechanical properties of soft rock reduction, such as salt crystallization, chemical and biological attack, and wind erosion, when water permeates into the rock.

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Results

Conclusion