Numerical study of particle motion in a two-dimensional channel with complex geometry

The article presents a study of the SST turbulence model in the Comsol Multiphysics software package for the problem of a two-dimensional channel with complex geometry. In this work, the finite element method is used for the numerical implementation of the turbulence equations. The implementation of the Comsol Multiphysics 6.1 software package showed good convergence, stability and high accuracy of the SST turbulence model

Modeling of Deformation Processes and Flow of Highly Concentrated Suspensions in Cylindrical Pipelines

The article discusses the improvement of mathematical modeling of deformation processes and the flow of highly concentrated suspensions (pulps) in cylindrical pipelines, taking into account the rheological model of visco-inertially deformable media introduced by I.N.Khusanov using the concept of deformation properties by inertia, which has found application to improve the efficiency of mining, concentrates and tailings for hydraulic transport. The problem is solved using finite-difference methods for vortex equations and the flow functio

Investigation of the Spalart-Allmares Turbulence Model for Calculating a Centrifugal Separator

A study of SA turbulence models in application to the calculation of swirling currents inside the separator has been carried out. The paper compared two approaches using vorticity and current functions to eliminate pressure and a semi-implicit method for pressure-binding SIMPLE to solve the Reynolds-averaged Navier-Stokes equations. For the numerical solution of both approaches, an implicit method against the flow was used

Mathematical modeling of particle movement in laminar flow in a pipe

The article provides basic information about the principles of calculations for solving the system of Navier–Stokes equations using the control volume method. The calculation of the incompressible fluid velocity field and pressure is found using the SIMPLE algorithm and MacCormack method. Particle trajectories were determined using the Lagrangian approach

Comparison of Turbulence Models for the Problem of an Asymmetric Two-Dimensional Plane Diffuser

In this paper, the turbulent flow in an asymmetric two-dimensional diffuser is investigated. In many applications, it is important to know whether the boundary layer (laminar or turbulent by calculating the Reynolds number, which is the ratio of the inertia force to the viscous fluid flow force) will separate from the surface or inside a particular body. If this happens, it is also important to know exactly where the flow separation will occur. The separation can be internal or external. This is quite important in many tasks

Numerical study of particle motion in a two-dimensional channel with complex geometry

The article presents a study of the SST turbulence model in the Comsol Multiphysics software package for the problem of a two-dimensional channel with complex geometry. In this work, the finite element method is used for the numerical implementation of the turbulence equations. The implementation of the Comsol Multiphysics 6.1 software package showed good convergence, stability and high accuracy of the SST turbulence model

Mathematical modeling of particle movement in laminar flow in a pipe

The article provides basic information about the principles of calculations for solving the system of Navier–Stokes equations using the control volume method. The calculation of the incompressible fluid velocity field and pressure is found using the SIMPLE algorithm and MacCormack method. Particle trajectories were determined using the Lagrangian approach

Comparison of the results of applying the turbulence model VT−92 and two-fluid model to the problem of a subsonic axisymmetric jet

This article studies an axisymmetric subsonic jet based on modern turbulence models. This task, despite its simplicity, is a rather complex problem for modeling turbulence. Therefore, many modern RANS models are not able to even qualitatively describe such problems. A comparative analysis of the turbulence models νt−92 and the two-fluid model for a submerged axisymmetric subsonic jet is carried out. For the numerical implementation of the problem, an implicit scheme was used. Comparative analysis was carried out for axial velocity, longitudinal velocity, transverse velocity and for turbulent stress. The obtained numerical results are compared with the results of NASA experimental data. It is shown that the two-fluid turbulence model more accurately describes turbulent flow than the turbulence model of the νt−92 model