https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=1392&context=cbe_pubs

A volume-filtered description of compressible particle-laden flows

Computational analysis of shock-induced flow through stationary particle clouds

A method is introduced for approximating the fully resolved flow through a monodisperse array of spheres using only the locations of the spheres and the volume-averaged Reynolds number. A pseudoturbulence stress model is proposed for use in a Lagrangian framework.

Lagrangian investigation of pseudo-turbulence in multiphase flow using superposable wakes

Shock interaction with a bed of randomly distributed particles leads to large variation in the drag forces, highlighting the impact of neighboring particles, and indicating a need for point-particle force models that account for this drag variation.

Effect of Mach number and volume fraction in air-shock interacting with a bed of randomly distributed spherical particles

Particle-resolved 3-D inviscid simulations of a planar shock interacting with a bed of randomly distributed spherical particles are carried out. The aim of this study is to investigate the importance of flowfield fluctuations caused by a random distribution of particles during shock–particle interaction. We present the volume-averaged governing equations. The volume-averaging process results in the appearance of the Reynolds stress term in the momentum equation, and similar terms also arise in the energy equation. These terms are generally neglected in the Euler–Lagrange or the Euler–Euler simulations of shock–particle interaction, and hence, the motivation for this study is to determine the importance of these stresses. The spatiotemporal evolution of the flow inside the particle bed is studied by presenting the mean and the fluctuating flow properties. We compute the RMS velocity, the magnitude of pseudo-turbulent Reynolds stress, and the magnitude of fluctuations in the pressure and total energy. We compare our results with previous studies involving shock interaction with a curtain of cylindrical particles. It is found that the strength of the fluctuating field is much weaker for the spherical particle case compared with the cylindrical particle case. Our results are also in good agreement with the recent study on a planar shock interacting with a random bed of spherical particles under viscous conditions.

Pseudo-turbulence in inviscid simulations of shock interacting with a bed of randomly distributed particles

https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=1406&context=me_pubs

Investigation and quantification of flow unsteadiness in shock-particle cloud interaction

This paper describes the extension of the simple low-dissipation AUSM (SLAU) scheme to a six-equation compressible two-fluid model for gas/liquid flow. This is the latest version of the AUSM-family of schemes with a new numerical flux function. This scheme features low dissipation without any tunable parameters in low Mach number regimes while maintaining the robustness of the AUSM-family fluxes at high Mach numbers with a very simple formulation. The accuracy of the method is tested with a well-known two-fluid air/water flow benchmark problem and the results were compared with the two-phase AUSM and AUSM-up schemes.

Zahra Hosseinzadeh-Nik

Papers

Investigation and quantification of flow unsteadiness in shock-particle cloud interaction

On the Extension of the SLAU Scheme to Compressible Two-Fluid Models