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3.2. Prerequisites

This tutorial is written with the assumption that you have completed one or more of 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.

3.3. Problem Description

The problem considered is shown schematically in Figure 3.1: Problem Specification (p. 96). The configuration consists of a series of side-by-side electronic chips, or modules, mounted on a circuit board. Air flow, confined between the circuit board and an upper wall, cools the modules. To take advantage of the symmetry present in the problem, the model will extend from the middle of one module to the plane of symmetry between it and the next module.

As shown in the figure, each half-module is assumed to generate 1.0 Watts and to have a bulk conductivity of 1.0 -K. The circuit board conductivity is assumed to be one order of magnitude lower:

0.1 -K. The air flow enters the system at 298 K with a velocity of 1 m/s. The Reynolds number of the flow, based on the module height, is about 600. The flow is therefore treated as laminar.

Figure 3.1: Problem Specification

3.4. Setup and Solution

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

3.4.1.Preparation

3.4.2.Reading the Mesh

3.4.3.Manipulating the Mesh in the Viewer

3.4.4.Adding Lights

3.4.5.Creating Isosurfaces

3.4.6.Generating Contours

3.4.7.Generating Velocity Vectors

3.4.8.Creating an Animation

3.4.9.Displaying Pathlines

3.4.10.Creating a Scene With Vectors and Contours

3.4.11.Advanced Overlay of Pathlines on a Scene

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Setup and Solution

3.4.12.Creating Exploded Views

3.4.13.Animating the Display of Results in Successive Streamwise Planes

3.4.14.Generating XY Plots

3.4.15.Creating Annotation

3.4.16.Saving Picture Files

3.4.17.Generating Volume Integral Reports

3.4.1. Preparation

To prepare for running this tutorial:

1.Download the postprocess.zip file here.

2.Unzip postprocess.zip to your working directory.

3.The files chip.cas.gz and chip.dat.gz can be found in the folder.

4.Use Fluent Launcher to start the 3D version of Fluent.

Fluent Launcher displays your Display Options preferences from the previous session.

For more information about 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.Select Serial under Processing Options.

7.Ensure that the Double Precision option is disabled.

3.4.2. Reading the Mesh

1. Read in the case and data files chip.cas.gz and chip.dat.gz.

File → Read → Case & Data...

When you select the case file, Fluent will read the data file automatically.

3.4.3. Manipulating the Mesh in the Viewer

1.Display the mesh surfaces board-top and chip.

Domain → Mesh → Display...

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a.Retain the default enabling of the Edges option and disable the Faces option in the Options group box.

b.Deselect all surfaces and select board-top and chip from the Surfaces selection list.

Click to deselect all surfaces. Click and select Surface Type under Group By to list the surfaces by type, as shown above.

c.Click the Colors... button to open the Mesh Colors dialog box.

i.Select Color by ID in the Options group box.

ii.Click Reset Colors to reset the mesh colors to the default settings and close the Mesh Colors dialog box.

d.Click Display.

2.Rotate and adjust the magnification of the view.

Use the left mouse button to rotate the view. Use the middle mouse button to adjust the magnification until you obtain an enlarged display of the circuit board in the region of the chip, as shown in Fig-

ure 3.2: Mesh Display of the Chip and Board Surfaces (p. 99).

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Setup and Solution

Figure 3.2: Mesh Display of the Chip and Board Surfaces

Extra

You can click the right mouse button on one of the mesh boundaries displayed in the graphics window and its surface group, ID, and name will be displayed in the console. This feature is especially useful when you have several zones of the same type and you want to distinguish between them.

3.Display the mesh faces.

Domain → Mesh → Display...

a.Disable Edges and enable Faces in the Options group box.

b.Click Display and close the Mesh Display dialog box.

3.4.4. Adding Lights

1.Add lighting effects.

The default light settings add a white light at the position (1,1,1). The default light is defined in the Lights dialog box by the Light ID 0 with Direction vectors (X, Y, Z) as (1, 1, 1).

View → Display → Options...

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a.Make sure that the Lights On option is enabled in the Lighting Attributes group box.

b.Retain Gouraud as the selected Lighting method.

Flat is the most basic lighting whereas Gouraud gives better color gradation. Note that Gouraud rounds off corners, and so should be used with caution on highly angular geometries.

c.Click Apply and close the Display Options dialog box.

Shading will be added to the surface mesh display (Figure 3.3: Graphics Window with Default Light- ing (p. 101)).

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Setup and Solution

Figure 3.3: Graphics Window with Default Lighting

2.Add lights in two directions, (-1, 1, 1) and (-1, 1, -1).

View → Graphics → Lights...

You can also open the Lights dialog box by clicking the Lights... button in the Display Options dialog box.

a.Set Light ID to 1.

b.Enable Light On.

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c.Enter -1, 1, and 1 for X, Y, and Z respectively in the Direction group box.

d.Retain the selection of Gouraud in the Lighting Method drop-down list.

e.Make sure that the Headlight On option is enabled.

The Headlight On option provides constant lighting effect from a light source directly in front of the model, in the direction of the view. You can turn off the headlight by disabling the Headlight On option (the results of this action are shown in Figure 3.4: Display with Additional Lighting: - Headlight Off (p. 102)).

Figure 3.4: Display with Additional Lighting: - Headlight Off

f.Click Apply.

g.Similarly, add a second light (Light ID= 2 with Light On enabled) with a Direction of (-1, 1, -1).

The result will be more softly shaded display (Figure 3.5: Display with Additional Lighting (p. 103)).

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