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Chapter 19: Using the Multiphase Models

This tutorial is divided into the following sections:

19.1.Introduction

19.2.Prerequisites

19.3.Problem Description

19.4.Setup and Solution

19.5.Summary

19.1. Introduction

This tutorial examines a turbulent two-phase flow consisting of air sparged into a water-filled mixing lab reactor. You will use the Eulerian multiphase model to simulate the mixing tank processes since the air and water phases are not in equilibrium throughout the simulation.

This tutorial demonstrates how to do the following:

•Set up a multiphase flow simulation involving air and water.

•Use multiple frames of reference.

•Use a degassing outlet boundary condition to enable only air, but not water, to escape from the boundary.

•Calculate a solution using the multiphase coupled solver with the Eulerian model.

•Display the solution results.

•Calculate torque and power requirements.

19.2. Prerequisites

This tutorial is written with the assumption that you have completed the introductory tutorial Fluid Flow and Heat Transfer in a Mixing Elbow (p. 35) found in this manual and that you are familiar with the ANSYS Fluent tree and ribbon structure. Some steps in the setup and solution procedure will not be shown explicitly.

19.3. Problem Description

The problem to be modeled in this tutorial is shown schematically in Figure 19.1: Problem Schemat- ic (p. 658).

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