## Turbulence Disturbance in CFD

The velocity of the fluid divides into average and oscillating components. The average velocity influences the mean particle velocity, while the oscillating velocity is effective on the propagation of particle turbulence. In turbulent flows, there are different structures of large…

## Particle injection

Particles can be injected from the walls, inlet, outlet, and opening to the domain of solution. The following information should be adjusted to determine the injection of the particle: Particle velocity: They can be equal to continuous phase velocity by…

## Comparison of Lagrangian model with Eulerian model

Comparison of Lagrangian model with Eulerian model In the Lagrangian model, the particle is considered as a dispersed phase, and the instantaneous location of particles is obtained by solving differential equations, but in the Eulerian method, each phase is considered…

## Particle Lagrangian Tracing

In this tutorial, the modeling of particles is considered. One of the important points in the physics of flows with particles is the path traversed by the particle. To calculate the path of the particle and trace it over time,…

## Free Surface Flow

There are examples in which two continuous phases are separated by an intermittent surface. Oil-water separators Free surface flows Decomposing small droplets that are highly dependent on mesh scales. There may or may not be a slip between the phases.…

## Lift force

Lift forces are perpendicular to the direction of the flow and the main physical mechanism in determining the distribution of particles in a vertical tube. For upward flows in a pipe, the bubbles are pushed to the sides of the…

## Equilibrium Multiphase Models

In some cases, there is no interest in knowing the details of the flow behavior of the two phases, but we are interested in using the exact properties for a mixture of two phases. For example, one can mention the…

## Algebraic slip model in ANSYS Fluent

The simplified multipart multiphase model uses the algebraic equation for slide-thrust velocities. Using this method, the processing time and numerical simulation complexities are reduced. However, this method only applies to multiphase flows, where the density and diameter of the dispersed…

## Model MUSIG (Multiple Size Group)

In the standard solution of the Eulerian-Eulerian, a dispersed phase is determined only by diameter. In some cases, the dispersed phase diameter (fluid droplets or bubbles) may be altered by fluid forces due to breaking or composition. The function of…

## Multiphase flow modeling methods

In modeling methods, several methods for modeling multiphase flows can be used. The suitability of the method depends on the nature of the multiphase flow and the physical properties involved.   Simplified multi-component methods: In these approaches for modeling the…

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