Defining Physics and Conditions

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Defining Physics and Conditions

The physics and conditions are specified as follows.

Add Modules

Click Select Modules in the Model Panel. The Physical Model Selection dialog box opens.
Select Flow under Available Modules list and click Add.
Select Heat under Available Modules list and click Add.
Click Close to close the Physical Model Selection dialog box.

Figure 11.80 - Adding modules

Properties

Disk

Select disk under Volumes in the Geometric Entities Panel.
Enter 2400 kg/m³ for Value under the Density drop-down list in the Model Tab of Properties Panel.
Select Blanked from the State drop down list under Flow.
Enter 1.5 W/m-K for Conductivity in the Conductivity list under Heat.
Enter 1.07 J/kg-K for Capacity under Heat.

Figure 11.81 - Properties for disk

Note: Setting the Flow > State to Blanked turns off the solution of the flow in that volume and, in effect, creates a solid.

Pipe

Select pipe under Volumes in the Geometric Entities Panel.
Enter 998 kg/m³ for Value under the Density in the Model Tab of Properties Panel.
Enter 0.001 Pa-s for Value in the Viscosity list under Flow .
Enter 0.7 Pa-s for Prandtl Number in the Conductivity list under Heat.
Enter 4180 J/kg-K for Capacity under Heat.

Figure 11.82 - Properties for pipe

Create a heat source

Select disk under Volumes in the Geometric Entities Panel.
Select Total Heat Source from Create a New Source drop-down list under Heat in the Model Tab of Properties Panel.
Enter 60 W for Value in the Source list under Heat.

Figure 11.83 - Heat source

Boundary conditions

The boundary conditions are specified as follows:

Inlet

Select inlet from the Boundaries list in the Geometric Entities Panel.
Select Specified Velocity from the Flow drop-down list in the Model Tab of Properties Panel.
Enter 0, 0, 0.001 m/s for Velocity in the Method list under Flow.

Figure 11.84 - Inlet conditions

Outlet

Select outlet from the Boundaries list in the Geometric Entities Panel.
Select Specified Pressure Outlet from the Flow drop-down list in the Model Tab of Properties Panel.
Enter 0 Pa for Pressure under Flow list.
Select User Specified from the Back Flow Option and enter 300 K for the Temperature under Flow.

Figure 11.85 - Outlet conditions

Wall

Select wall from the Boundaries list in the Geometric Entities Panel.
Select Specified Temperature from the Heat drop-down list in the Model Tab of Properties Panel.
Enter 320 K for Temperature under Heat.

Figure 11.86 - Wall conditions

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