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References

2.Display the volume fraction of solids (Figure 21.6: Contours of Volume Fraction of Solids (p. 747)).

a.Select solids from the Phase drop-down list.

b.Select Phases... and Volume fraction from the Contours of drop-down lists.

c.Click Display and close the Contours dialog box.

d.Zoom in to show the contours close to the region where the change in volume fraction is the greatest.

Note that the region occupied by the granular phase has expanded slightly, as a result of fluidization.

Figure 21.6: Contours of Volume Fraction of Solids

21.5. Summary

This tutorial demonstrated how to set up and solve a granular multiphase problem with heat transfer, using the Eulerian model. You learned how to set boundary conditions for the mixture and both phases. The solution obtained is in excellent agreement with analytical results from Kuipers et al. [1].

21.6. Further Improvements

This tutorial guides you through the steps to reach an initial solution. You may be able to obtain a more accurate solution by using an appropriate higher-order discretization scheme and by adapting the mesh further. Mesh adaption can also ensure that the solution is independent of the mesh. These steps are demonstrated in Fluid Flow and Heat Transfer in a Mixing Elbow (p. 35).

21.7. References

1.J. A. M. Kuipers, W. Prins, and W. P. M. Van Swaaij “Numerical Calculation of Wall-to-Bed Heat Transfer Coefficients in Gas-Fluidized Beds", Department of Chemical Engineering, Twente University of Technology, in AIChE Journal, July 1992, Vol. 38, No. 7.

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Chapter 22: Modeling One-Way Fluid-Structure Interaction (FSI)

Within Fluent

This tutorial is divided into the following sections:

22.1.Introduction

22.2.Prerequisites

22.3.Problem Description

22.4.Setup and Solution

22.5.Summary

22.1. Introduction

This tutorial examines turbulent air flow through a cylindrical test chamber that includes a steel probe. You will enable a structural model in order to simulate the deformation of the probe as a result of the fluid flow. It is assumed that the deformation will be small enough that this problem can be modeled as a one-way fluid-structure interaction (FSI) simulation; that is, the fluid flow will affect the deformation

of the structure, but not vice versa. Because Fluent performs all of the structural calculations (as opposed to using a separate structural program), it is referred to as "intrinsic FSI".

This tutorial demonstrates how to do the following:

•Run a journal file to complete an initial fluid flow simulation without structural calculations.

•Enable a structural model.

•Define structural material properties, a solid cell zone, and related boundary conditions.

•Turn off flow and turbulence equations.

•Complete a one-way FSI simulation.

•Postprocess the deformation of a solid cell zone.

22.2. 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 Outline View window and ribbon structure. Some steps in the setup and solution procedure will not be shown explicitly.

22.3. Problem Description

The problem to be modeled in this tutorial is shown schematically in Figure 22.1: Problem Schemat- ic (p. 750).

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