1- SIMPLE In this method, a semi-implicit method for the relationship between momentum equations, continuity and static pressure has a moderate convergence in most simulations, and many of the old soft-user use this method in simulations. The initial guess for…
The Navier Stokes equations are modeled by looking at the Navier Stokes equations. These equations have at least four main sources in the base state. These unknowns include pressure and velocity in three directions (p, u, v, w). In addition,…
In addition to lift force, dragging and floating forces, other forces can also effect on the particles, depending on the conditions. These forces include electrostatic force, magnetic, thermophoric, Van der Waals adhesion, drag and lift near the wall. Electrostatic forces…
The standard Lagrangian model is limited to gas-particle diluted flows. Therefore, in these processes, particle interaction does not play an important role and the momentum is transmitted through continuous interaction with the particle. For flows with the above parameter less…
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…
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 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…
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,…
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 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…
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