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Figure 20.1: Solidification in Czochralski Model

In the above figure, is the mushy zone constant. For details on modeling the solidification/melting process, refer to momentum equations in the Fluent Theory Guide.

20.4. Setup and Solution

The following sections describe the setup and solution steps for this tutorial:

20.4.1.Preparation

20.4.2.Reading and Checking the Mesh

20.4.3.Specifying Solver and Analysis Type

20.4.4.Specifying the Models

20.4.5.Defining Materials

20.4.6.Setting the Cell Zone Conditions

20.4.7.Setting the Boundary Conditions

20.4.8.Solution: Steady Conduction

20.4.9.Solution:Transient Flow and Heat Transfer

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Setup and Solution

20.4.1. Preparation

To prepare for running this tutorial:

1.Download the solidification.zip file here.

2.Unzip solidification.zip to your working directory.

3.The file solid.msh can be found in the folder.

4.Use Fluent Launcher to start the 2D single precision (disable Double Precision) version of ANSYS Fluent. Fluent Launcher displays your Display Options preferences from the previous session.

For more information about the Fluent Launcher, see starting ANSYS Fluent using the Fluent Launcher in the Fluent Getting Started Guide.

5.Ensure that the Display Mesh After Reading option is enabled.

6.Ensure that the Serial processing option is selected.

20.4.2. Reading and Checking the Mesh

1.Read the mesh file solid.msh.

File → Read → Mesh...

As the mesh is read by ANSYS Fluent, messages will appear in the console reporting the progress of the reading.

A warning about the use of axis boundary conditions is displayed in the console. You are asked to consider making changes to the zone type or change the problem definition to axisymmetric. You will change the problem to axisymmetric swirl later in this tutorial.

2.Check the mesh.

Domain → Mesh → Check → Perform Mesh Check

ANSYS Fluent will perform various checks on the mesh and will report the progress in the console. Make sure that the minimum volume is a positive number.

3.Examine the mesh (Figure 20.2: Mesh Display (p. 676)).

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Figure 20.2: Mesh Display

20.4.3. Specifying Solver and Analysis Type

1.Select Axisymmetric Swirl from the 2D Space list.

Setup → General

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Setup and Solution

The geometry comprises an axisymmetric bowl. Furthermore, swirling flows are considered in this problem, so the selection of Axisymmetric Swirl best defines this geometry.

Also, note that the rotation axis is the X axis. Hence, the X direction is the axial direction and the Y direction is the radial direction. When modeling axisymmetric swirl, the swirl direction is the tangential direction.

2. Add the effect of gravity on the model.

Setup → General → Gravity

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