Volume of Fluid (VOF), Package for Intermediate, Part 1

Description

Multi-phase Volume of Fluid (VOF) – ANSYS Fluent Training Package, 10 Practical Exercises for INTERMEDIATE Users

This CFD training package is prepared for intermediate users of Ansys Fluent software in the Volume of Fluid (VOF) Multi-phase areas. You will learn and obtain comprehensive training on how to simulate medium projects. The achieved knowledge will enable you to choose the most appropriate modeling approaches and methods for applications and CFD simulations.

This package trains the necessary proficiency you will require to start doing average computational fluid dynamics (CFD) VOF Multiphase simulations on your own using Ansys Fluent software. Qualified training movies and comprehensive CFD concepts explanations, including setup, solution, results, and all perspectives of carrying out CFD simulations in Ansys Fluent.

Bubbles

In project number 1, a numerical simulation of bubbles’ motion under the water on a plate with and without shear stress has been done. The VOF model has been used to simulate and solve the two-phase flow field equations. This project aims to consider the effect of surface tension in simulations where the free surface in phase is investigated.

In project number 2, numerical simulations of air bubbles under a water column with two different surface tension have been done. The VOF model has been used to simulate and solve the two-phase flow field equations. The two modes in this project are simulated and compared.

Tank (volume of fluid)

Project number 3 simulates the water discharge of a rectangular tank under the influence of gravity. The VOF model has been used to simulate and solve the two-phase flow field equations. The computational domain consists of three tanks that are connected by pipes.

Project number 4 simulates the tank filling. The goal of many operations in the chemical industry is to separate the components of a solution or mixture from each other or to obtain a pure substance from a combination of two or more components. In this Tank Filling simulation,  using the VOF (volume of fluid) method, the interaction of three phases, including water, alcohol, and air was investigated. For this purpose, the effect of shear forces on the boundary between the phases was applied by applying surface stresses between the two phases.

In project number 5, Ansys Fluent software has been used to simulate the water discharge of a rotating tank. The Volume of  Fluid (VOF) model has been used to simulate and solve the two-phase flow field equations. The primary phase is air and the secondary phase is water. The Tank rotates about the Y-Axis at an 80 rev/min speed. There are two circular orifices in the bottom of the Tank that water discharges from them.

Project number 6 simulates the tank filling. In this project, we simulate Tank charge/filling (2-phase) between two reservoirs with fluid air and water and the Same height of tanks. The goal of many operations in the chemical industry is to separate the components of a solution or mixture from each other or to obtain a pure substance from a combination of two or more components. In this Tank Filling simulation,  using the VOF (volume of fluid) method, the interaction of two phases, including water and air, was investigated.

Venturi

The venturi effect reduces the pressure in the fluid when the fluid passes through the narrow part of the pipe. In project number 7, a two-phase CFD simulation of airflow inside a Venturi using the VOF model, and accurate modeling of air bubbles as a separate phase in water is carried out. After passing this stream through the bottleneck, the flow rate increases, and its pressure decreases. This pressure drop causes air to be sucked out of the hole located in the venturi throat. As air is added to the stream, the amount of air volume fraction increases.

Siphon

Water always flows from an area under higher pressure to an area of lower pressure. The siphon effect occurs when the fluid flows to the highest portion of the bend pipe due to the pressure difference and then comes down from there due to gravity. In project number 8, Ansys Fluent software used a Numerical simulation of a siphon. The VOF model has been used to simulate and solve the two-phase flow field equations. The flash tank discharges and the siphoning effect causes the water to drain.

Monometer (volume of fluid)

In project number 9, we simulated the monometer and it has been shown how there is variation in U-tube manometric fluid column. The multi-phase  VOF model has been used. A convergent and divergent nozzle has been used to create a pressure difference. One end of the manometer is attached at the throat and the other at the converging section. There is a rise in the liquid column in the U- tube manometer in the low-pressure region.

Absorption

Project number 10 simulates the absorption of ammonia in the air inside an absorption tower. The adsorption process is one of the methods of separating the components of a gas mixture placed in a solvent (liquid phase). One of the applications of absorption towers in refineries is to separate ammonia from gas. In this simulation, the VOF multiphase flow model is used; So that the airflow contains one percent ammonia, and liquid water is considered a solvent.