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a.Enable Gravity.

b.Enter -9.81 for X in the Gravitational Acceleration group box.

20.4.4. Specifying the Models

1. Define the solidification model.

Setup → Models → Solidification & Melting Edit...

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Setup and Solution

a.Enable the Solidification/Melting option in the Solidification and Melting dialog box.

The Solidification and Melting dialog box will expand to show the related parameters.

b.Retain the default value of 100000 for the Mushy Zone Constant.

This default value is acceptable for most cases.

c.Enable the Include Pull Velocities option.

By including the pull velocities, you will account for the movement of the solidified material as it is continuously withdrawn from the domain in the continuous casting process.

When you enable this option, the Solidification and Melting dialog box will expand to show the Compute Pull Velocities option. If you were to enable this additional option, ANSYS Fluent would compute the pull velocities during the calculation. This approach is computationally expensive and is recommended only if the pull velocities are strongly dependent on the location of the liquid-solid interface. In this tutorial, you will patch values for the pull velocities instead of having ANSYS Fluent compute them.

For more information about computing the pull velocities, see the Fluent User's Guide.

d.Click OK to close the Solidification and Melting dialog box.

An Information dialog box opens, telling you that available material properties have changed for the solidification model. You will set the material properties later, so you can click OK in the dialog box to acknowledge this information.

Note

ANSYS Fluent will automatically enable the energy calculation when you enable the solidification model, so you need not visit the Energy dialog box.

20.4.5. Defining Materials

In this step, you will create a new material and specify its properties, including the melting heat, solidus temperature, and liquidus temperature.

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1. Define a new material.

Setup → Materials → Fluid → air Edit...

a.Enter liquid-metal for Name.

b.Select polynomial from the Density drop-down list in the Properties group box.

c.Configure the following settings In the Polynomial Profile dialog box:

i.Set Coefficients to 2.

ii.In the Coefficients group box, enter 8000 for 1 and -0.1 for 2.

As shown in Figure 20.1: Solidification in Czochralski Model (p. 674), the density of the material is defined by a polynomial function: .

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Setup and Solution

iii. Click OK to close the Polynomial Profile dialog box.

d.In the Question dialog box, click Yes to overwrite air and add the new material (liquid-metal) to the

Fluent Fluid Materials drop-down list.

e.Click OK in the information dialog box.

f.Set the liquid-metal material properties as follows:

g.Enter 680 for Cp (Specific Heat).

h.Enter 30 for Thermal Conductivity.

i.Enter 0.00553 for Viscosity.

j.Enter 100000 for Pure Solvent Melting Heat.

Scroll down the group box to find Pure Solvent Melting Heat and the properties that follow.

k.Enter 1150 for Solidus Temperature.

l.Enter 1150 for Liquidus Temperature.

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